diff mbox series

[3/9] drm/verisilicon: Add basic drm driver

Message ID 20230602074043.33872-4-keith.zhao@starfivetech.com
State New
Headers show
Series Add DRM driver for StarFive SoC JH7110 | expand

Commit Message

Keith Zhao June 2, 2023, 7:40 a.m. UTC 
Add a basic platform driver of the DRM driver for JH7110 SoC.

Signed-off-by: Keith Zhao <keith.zhao@starfivetech.com>
---
 MAINTAINERS                          |   2 +
 drivers/gpu/drm/Kconfig              |   2 +
 drivers/gpu/drm/Makefile             |   1 +
 drivers/gpu/drm/verisilicon/Kconfig  |  13 ++
 drivers/gpu/drm/verisilicon/Makefile |   6 +
 drivers/gpu/drm/verisilicon/vs_drv.c | 284 +++++++++++++++++++++++++++
 drivers/gpu/drm/verisilicon/vs_drv.h |  48 +++++
 include/uapi/drm/drm_fourcc.h        |  83 ++++++++
 include/uapi/drm/vs_drm.h            |  50 +++++
 9 files changed, 489 insertions(+)
 create mode 100644 drivers/gpu/drm/verisilicon/Kconfig
 create mode 100644 drivers/gpu/drm/verisilicon/Makefile
 create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.c
 create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.h
 create mode 100644 include/uapi/drm/vs_drm.h

Comments

Shengyu Qu July 3, 2023, 6:42 p.m. UTC | #1 
Hello Keith,

While compiling this driver as a module, a error happens:

drivers/gpu/drm/verisilicon/vs_drm: struct of_device_id is 200 bytes.  
The last of 1 is:
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x76 0x65 0x72 0x69 0x73 0x69 
0x6c 0x69 0x63 0x6f 0x6e 0x2c 0x64 0x69 0x73 0x70 0x6c 0x61 0x79 0x2d 
0x73 0x75 0x62 0x73 0x79 0x73 0x74 0x65 0x6d 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0x00 0x00 0x00 0x00
FATAL: modpost: drivers/gpu/drm/verisilicon/vs_drm: struct of_device_id 
is not terminated with a NULL entry!

> +
> +static const struct of_device_id vs_drm_dt_ids[] = {
> +	{ .compatible = "verisilicon,display-subsystem", },
> +};
> +

So, this should be:

static const struct of_device_id vs_drm_dt_ids[] = {
	{ .compatible = "verisilicon,display-subsystem", },
	{ },
};

After fixing this problem, another error happens:

ERROR: modpost: module vs_drm uses symbol dma_buf_mmap from namespace 
DMA_BUF, but does not import it.

Please fix.

Best regards,
Shengyu
Keith Zhao July 4, 2023, 6:09 a.m. UTC | #2 
On 2023/7/4 2:42, Shengyu Qu wrote:
> Hello Keith,
> 
> While compiling this driver as a module, a error happens:
> 
> drivers/gpu/drm/verisilicon/vs_drm: struct of_device_id is 200 bytes.  The last of 1 is:
> 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x76 0x65 0x72 0x69 0x73 0x69 0x6c 0x69 0x63 0x6f 0x6e 0x2c 0x64 0x69 0x73 0x70 0x6c 0x61 0x79 0x2d 0x73 0x75 0x62 0x73 0x79 0x73 0x74 0x65 0x6d 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
> 0x00 0x00
> FATAL: modpost: drivers/gpu/drm/verisilicon/vs_drm: struct of_device_id is not terminated with a NULL entry!
> 
>> +
>> +static const struct of_device_id vs_drm_dt_ids[] = {
>> +    { .compatible = "verisilicon,display-subsystem", },
>> +};
>> +
> 
> So, this should be:
> 
> static const struct of_device_id vs_drm_dt_ids[] = {
>     { .compatible = "verisilicon,display-subsystem", },
>     { },
> };
> 
> After fixing this problem, another error happens:
> 
> ERROR: modpost: module vs_drm uses symbol dma_buf_mmap from namespace DMA_BUF, but does not import it.
> 
> Please fix.
> 
> Best regards,
> Shengyu

hello Shengyu , 

I can reproduce the error generated by compiling ko , and add MODULE_IMPORT_NS(DMA_BUF) at the beginning of vs_gem.c ,
it can fix the error message, 
I will add this in my next patch , thanks
Nicolas Dufresne July 7, 2023, 6:09 p.m. UTC | #3 
Hi Thomas,

Le lundi 19 juin 2023 à 14:59 +0200, Thomas Zimmermann a écrit :
> Hi,
> 
> I appreciate that you split the driver into small patches. Please find 
> some comments below.
> 
> Am 02.06.23 um 09:40 schrieb Keith Zhao:
> > Add a basic platform driver of the DRM driver for JH7110 SoC.
> > 
> > Signed-off-by: Keith Zhao <keith.zhao@starfivetech.com>
> > ---
> >   MAINTAINERS                          |   2 +
> >   drivers/gpu/drm/Kconfig              |   2 +
> >   drivers/gpu/drm/Makefile             |   1 +
> >   drivers/gpu/drm/verisilicon/Kconfig  |  13 ++
> >   drivers/gpu/drm/verisilicon/Makefile |   6 +
> >   drivers/gpu/drm/verisilicon/vs_drv.c | 284 +++++++++++++++++++++++++++
> >   drivers/gpu/drm/verisilicon/vs_drv.h |  48 +++++
> >   include/uapi/drm/drm_fourcc.h        |  83 ++++++++
> >   include/uapi/drm/vs_drm.h            |  50 +++++
> >   9 files changed, 489 insertions(+)
> >   create mode 100644 drivers/gpu/drm/verisilicon/Kconfig
> >   create mode 100644 drivers/gpu/drm/verisilicon/Makefile
> >   create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.c
> >   create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.h
> >   create mode 100644 include/uapi/drm/vs_drm.h
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 293aa13d484c..da5b6766a7bb 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -7055,6 +7055,8 @@ L:	dri-devel@lists.freedesktop.org
> >   S:	Maintained
> >   T:	git git://anongit.freedesktop.org/drm/drm-misc
> >   F:	Documentation/devicetree/bindings/display/verisilicon/
> > +F:	drivers/gpu/drm/verisilicon/
> > +F:	include/uapi/drm/vs_drm.h
> >   
> >   DRM DRIVERS FOR VIVANTE GPU IP
> >   M:	Lucas Stach <l.stach@pengutronix.de>
> > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> > index ba3fb04bb691..f7e461fa4656 100644
> > --- a/drivers/gpu/drm/Kconfig
> > +++ b/drivers/gpu/drm/Kconfig
> > @@ -371,6 +371,8 @@ source "drivers/gpu/drm/solomon/Kconfig"
> >   
> >   source "drivers/gpu/drm/sprd/Kconfig"
> >   
> > +source "drivers/gpu/drm/verisilicon/Kconfig"
> > +
> >   config DRM_HYPERV
> >   	tristate "DRM Support for Hyper-V synthetic video device"
> >   	depends on DRM && PCI && MMU && HYPERV
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index a33257d2bc7f..e50622ee4e46 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -194,3 +194,4 @@ obj-y			+= gud/
> >   obj-$(CONFIG_DRM_HYPERV) += hyperv/
> >   obj-y			+= solomon/
> >   obj-$(CONFIG_DRM_SPRD) += sprd/
> > +obj-$(CONFIG_DRM_VERISILICON) += verisilicon/
> > diff --git a/drivers/gpu/drm/verisilicon/Kconfig b/drivers/gpu/drm/verisilicon/Kconfig
> > new file mode 100644
> > index 000000000000..89d12185f73b
> > --- /dev/null
> > +++ b/drivers/gpu/drm/verisilicon/Kconfig
> > @@ -0,0 +1,13 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +config DRM_VERISILICON
> > +	tristate "DRM Support for VeriSilicon"
> 
> Can you rename the driver and files? 'VeriSilicon' seems 
> unpronounceable. Simply 'StarFive' and starfive/ would be fine.

Are you sure you want to request this ? If the display controller is a
Verisilicon design, it will be super odd to use on other SoC that aren't from
StarFive. Think about STM network driver, which is DesignWare.

Nicolas

> 
> > +	depends on DRM
> > +	select DRM_KMS_HELPER
> > +	select CMA
> > +	select DMA_CMA
> > +	help
> > +	  Choose this option if you have a VeriSilicon soc chipset.
> > +	  This driver provides VeriSilicon kernel mode
> > +	  setting and buffer management. It does not
> > +	  provide 2D or 3D acceleration.
> > diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
> > new file mode 100644
> > index 000000000000..64ce1b26546c
> > --- /dev/null
> > +++ b/drivers/gpu/drm/verisilicon/Makefile
> > @@ -0,0 +1,6 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +vs_drm-objs := vs_drv.o
> > +
> > +obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
> > +
> > diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
> > new file mode 100644
> > index 000000000000..24d333598477
> > --- /dev/null
> > +++ b/drivers/gpu/drm/verisilicon/vs_drv.c
> > @@ -0,0 +1,284 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/component.h>
> > +#include <linux/delay.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/iommu.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/of_reserved_mem.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/reset.h>
> > +#include <linux/version.h>
> > +
> > +#include <drm/drm_aperture.h>
> > +#include <drm/drm_crtc.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_debugfs.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_fb_helper.h>
> > +#include <drm/drm_fbdev_generic.h>
> > +#include <drm/drm_file.h>
> > +#include <drm/drm_fourcc.h>
> > +#include <drm/drm_ioctl.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_prime.h>
> > +#include <drm/drm_probe_helper.h>
> > +#include <drm/drm_vblank.h>
> > +
> > +#include "vs_drv.h"
> > +
> > +#define DRV_NAME	"starfive"
> > +#define DRV_DESC	"Starfive DRM driver"
> > +#define DRV_DATE	"202305161"
> > +#define DRV_MAJOR	1
> > +#define DRV_MINOR	0
> > +
> > +static struct platform_driver vs_drm_platform_driver;
> > +
> > +static const struct file_operations fops = {
> > +	.owner			= THIS_MODULE,
> > +	.open			= drm_open,
> > +	.release		= drm_release,
> > +	.unlocked_ioctl	= drm_ioctl,
> > +	.compat_ioctl	= drm_compat_ioctl,
> > +	.poll			= drm_poll,
> > +	.read			= drm_read,
> > +};
> > +
> > +static struct drm_driver vs_drm_driver = {
> > +	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
> > +	.lastclose		= drm_fb_helper_lastclose,
> > +	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> > +	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> > +	.fops			= &fops,
> > +	.name			= DRV_NAME,
> > +	.desc			= DRV_DESC,
> > +	.date			= DRV_DATE,
> > +	.major			= DRV_MAJOR,
> > +	.minor			= DRV_MINOR,
> > +};
> > +
> > +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
> > +				   unsigned int alignment)
> > +{
> > +	struct vs_drm_private *priv = drm_dev->dev_private;
> > +
> > +	if (alignment > priv->pitch_alignment)
> > +		priv->pitch_alignment = alignment;
> > +}
> > +
> > +static int vs_drm_bind(struct device *dev)
> > +{
> > +	struct drm_device *drm_dev;
> > +	struct vs_drm_private *priv;
> > +	int ret;
> > +	static u64 dma_mask = DMA_BIT_MASK(40);
> > +
> > +	/* Remove existing drivers that may own the framebuffer memory. */
> > +	ret = drm_aperture_remove_framebuffers(false, &vs_drm_driver);
> > +	if (ret) {
> > +		DRM_DEV_ERROR(dev,
> 
> drm_err(), drm_info(), drm_warn(), etc.  Here and everwhere else. The 
> DRM_DEV_*() print macros are obsolete.
> 
> > +			      "Failed to remove existing framebuffers - %d.\n",
> > +			      ret);
> > +		return ret;
> > +	}
> > +
> > +	drm_dev = drm_dev_alloc(&vs_drm_driver, dev);
> > +	if (IS_ERR(drm_dev))
> > +		return PTR_ERR(drm_dev);
> > +
> > +	dev_set_drvdata(dev, drm_dev);
> > +
> > +	priv = devm_kzalloc(drm_dev->dev, sizeof(struct vs_drm_private),
> > +			    GFP_KERNEL);
> > +	if (!priv) {
> > +		ret = -ENOMEM;
> > +		goto err_put_dev;
> > +	}
> > +
> > +	priv->pitch_alignment = 64;
> > +	priv->dma_dev = drm_dev->dev;
> > +	priv->dma_dev->coherent_dma_mask = dma_mask;
> > +	drm_dev->dev_private = priv;
> 
> dev_private is obsolete and about to go away at some point.
> 
> Please embed drm_device in vs_drm_private and allocate the memory with 
> devm_drm_dev_alloc().
> 
> > +
> > +	drm_mode_config_init(drm_dev);
> 
> drmm_mode_config_init() please.
> 
> > +
> > +	/* Now try and bind all our sub-components */
> > +	ret = component_bind_all(dev, drm_dev);
> > +	if (ret)
> > +		goto err_mode;
> > +
> > +	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
> > +	if (ret)
> > +		goto err_bind;
> > +
> > +	drm_mode_config_reset(drm_dev);
> > +
> > +	drm_kms_helper_poll_init(drm_dev);
> > +
> > +	ret = drm_dev_register(drm_dev, 0);
> > +	if (ret)
> > +		goto err_helper;
> > +
> > +	drm_fbdev_generic_setup(drm_dev, 32);
> > +
> > +	return 0;
> > +
> > +err_helper:
> > +	drm_kms_helper_poll_fini(drm_dev);
> > +err_bind:
> > +	component_unbind_all(drm_dev->dev, drm_dev);
> > +err_mode:
> > +	drm_mode_config_cleanup(drm_dev);
> > +	if (priv->domain)
> > +		iommu_domain_free(priv->domain);
> > +err_put_dev:
> > +	drm_dev->dev_private = NULL;
> > +	dev_set_drvdata(dev, NULL);
> > +	drm_dev_put(drm_dev);
> > +	return ret;
> > +}
> > +
> > +static void vs_drm_unbind(struct device *dev)
> > +{
> > +	struct drm_device *drm_dev = dev_get_drvdata(dev);
> > +	struct vs_drm_private *priv = drm_dev->dev_private;
> > +
> > +	drm_dev_unregister(drm_dev);
> > +
> > +	drm_kms_helper_poll_fini(drm_dev);
> > +
> > +	component_unbind_all(drm_dev->dev, drm_dev);
> > +
> > +	drm_mode_config_cleanup(drm_dev);
> > +
> > +	if (priv->domain) {
> > +		iommu_domain_free(priv->domain);
> > +		priv->domain = NULL;
> > +	}
> > +
> > +	drm_dev->dev_private = NULL;
> > +	dev_set_drvdata(dev, NULL);
> > +	drm_dev_put(drm_dev);
> 
> You rather want to convert the individual steps of this cleanup to 
> managed functions (drmm_ and devm_) to automate the cleanup when as part 
> of drm_dev_put().
> 
> > +}
> > +
> > +static const struct component_master_ops vs_drm_ops = {
> > +	.bind = vs_drm_bind,
> > +	.unbind = vs_drm_unbind,
> > +};
> > +
> > +static struct platform_driver *drm_sub_drivers[] = {
> > +};
> > +
> > +#define NUM_DRM_DRIVERS \
> > +	(sizeof(drm_sub_drivers) / sizeof(struct platform_driver *))
> 
> Does this really work? sizeof(drm_sub_drivers) isn't know at compile 
> time. It is always assumed to be 0 AFAICT. Or do you fill this array in 
> later patches?
> 
> 
> > +
> > +static int compare_dev(struct device *dev, void *data)
> > +{
> > +	return dev == (struct device *)data;
> > +}
> > +
> > +static struct component_match *vs_drm_match_add(struct device *dev)
> > +{
> > +	struct component_match *match = NULL;
> > +	int i;
> > +
> > +	for (i = 0; i < NUM_DRM_DRIVERS; ++i) {
> > +		struct platform_driver *drv = drm_sub_drivers[i];
> > +		struct device *p = NULL, *d;
> > +
> > +		while ((d = platform_find_device_by_driver(p, &drv->driver))) {
> > +			put_device(p);
> > +
> > +			component_match_add(dev, &match, compare_dev, d);
> > +			p = d;
> > +		}
> > +		put_device(p);
> > +	}
> > +
> > +	return match ?: ERR_PTR(-ENODEV);
> > +}
> > +
> > +static int vs_drm_platform_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct component_match *match;
> > +
> > +	match = vs_drm_match_add(dev);
> > +	if (IS_ERR(match))
> > +		return PTR_ERR(match);
> > +
> > +	return component_master_add_with_match(dev, &vs_drm_ops, match);
> > +}
> > +
> > +static int vs_drm_platform_remove(struct platform_device *pdev)
> > +{
> > +	component_master_del(&pdev->dev, &vs_drm_ops);
> > +	return 0;
> > +}
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int vs_drm_suspend(struct device *dev)
> > +{
> > +	struct drm_device *drm = dev_get_drvdata(dev);
> > +
> > +	return drm_mode_config_helper_suspend(drm);
> > +}
> > +
> > +static int vs_drm_resume(struct device *dev)
> > +{
> > +	struct drm_device *drm = dev_get_drvdata(dev);
> > +
> > +	return drm_mode_config_helper_resume(drm);
> > +}
> > +#endif
> > +
> > +static SIMPLE_DEV_PM_OPS(vs_drm_pm_ops, vs_drm_suspend, vs_drm_resume);
> > +
> > +static const struct of_device_id vs_drm_dt_ids[] = {
> > +	{ .compatible = "verisilicon,display-subsystem", },
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, vs_drm_dt_ids);
> > +
> > +static struct platform_driver vs_drm_platform_driver = {
> > +	.probe = vs_drm_platform_probe,
> > +	.remove = vs_drm_platform_remove,
> > +
> > +	.driver = {
> > +		.name = DRV_NAME,
> > +		.of_match_table = vs_drm_dt_ids,
> > +		.pm = &vs_drm_pm_ops,
> > +	},
> > +};
> > +
> > +static int __init vs_drm_init(void)
> > +{
> > +	int ret;
> > +
> > +	ret = platform_register_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = platform_driver_register(&vs_drm_platform_driver);
> > +	if (ret)
> > +		platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> > +
> > +	return ret;
> > +}
> > +
> > +static void __exit vs_drm_fini(void)
> > +{
> > +	platform_driver_unregister(&vs_drm_platform_driver);
> > +	platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> > +}
> > +
> > +module_init(vs_drm_init);
> > +module_exit(vs_drm_fini);
> > +
> > +MODULE_DESCRIPTION("VeriSilicon DRM Driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
> > new file mode 100644
> > index 000000000000..0382b44e3bf0
> > --- /dev/null
> > +++ b/drivers/gpu/drm/verisilicon/vs_drv.h
> > @@ -0,0 +1,48 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> > + */
> > +
> > +#ifndef __VS_DRV_H__
> > +#define __VS_DRV_H__
> > +
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/version.h>
> > +#include <drm/drm_drv.h>
> > +#include <drm/drm_gem.h>
> > +
> > +/*
> > + *
> > + * @dma_dev: device for DMA API.
> > + *	- use the first attached device if support iommu
> > +	else use drm device (only contiguous buffer support)
> > + * @domain: iommu domain for DRM.
> > + *	- all DC IOMMU share same domain to reduce mapping
> > + * @pitch_alignment: buffer pitch alignment required by sub-devices.
> > + *
> > + */
> > +struct vs_drm_private {
> > +	struct device *dma_dev;
> > +	struct iommu_domain *domain;
> > +	unsigned int pitch_alignment;
> > +};
> 
> As mentioned, this struct needs to embed struct drm_device.
> 
> > +
> > +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
> > +				   unsigned int alignment);
> > +
> > +static inline struct device *to_dma_dev(struct drm_device *dev)
> > +{
> > +	struct vs_drm_private *priv = dev->dev_private;
> > +
> > +	return priv->dma_dev;
> 
> And this needs to be an upcast via container_of().
> 
> > +}
> > +
> > +static inline bool is_iommu_enabled(struct drm_device *dev)
> > +{
> > +	struct vs_drm_private *priv = dev->dev_private;
> > +
> > +	return priv->domain ? true : false;
> > +}
> > +
> > +#endif /* __VS_DRV_H__ */
> > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > index de703c6be969..af4fb50f9207 100644
> > --- a/include/uapi/drm/drm_fourcc.h
> > +++ b/include/uapi/drm/drm_fourcc.h
> 
> The UAPI changes shouldn't be needed in this patch?
> 
> > @@ -419,6 +419,7 @@ extern "C" {
> >   #define DRM_FORMAT_MOD_VENDOR_ARM     0x08
> >   #define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
> >   #define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a
> > +#define DRM_FORMAT_MOD_VENDOR_VS      0x0b
> >   
> >   /* add more to the end as needed */
> >   
> > @@ -1519,6 +1520,88 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
> >   #define AMD_FMT_MOD_CLEAR(field) \
> >   	(~((__u64)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
> >   
> > +#define DRM_FORMAT_MOD_VS_TYPE_NORMAL        0x00
> > +#define DRM_FORMAT_MOD_VS_TYPE_COMPRESSED    0x01
> > +#define DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT  0x02
> > +#define DRM_FORMAT_MOD_VS_TYPE_MASK     ((__u64)0x3 << 54)
> > +
> > +#define fourcc_mod_vs_code(type, val) \
> > +	fourcc_mod_code(VS, ((((__u64)type) << 54) | (val)))
> > +
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_MODE_MASK    0x3F
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_XMAJOR   0x00
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_YMAJOR   0x01
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4     0x02
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4      0x03
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_4X8      0x04
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X4   0x06
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_64X4     0x07
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4     0x08
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X1  0x09
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X1  0x0A
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X4   0x0B
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X2  0x0C
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X2  0x0D
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X4  0x0E
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X1   0x0F
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X8     0x10
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X16     0x11
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_512X1  0x12
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X4   0x13
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X2   0x14
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X2   0x15
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X1   0x16
> > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X1   0x17
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_128X4    0x18
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_256X4    0x19
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_512X4    0x1A
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X16    0x1B
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X16    0x1C
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_64X16    0x1D
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_128X8    0x1E
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4_S    0x1F
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_S   0x20
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_S   0x21
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_LSB 0x22
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_LSB 0x23
> > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X8     0x24
> > +
> > +#define DRM_FORMAT_MOD_VS_DEC_ALIGN_32      (0x01 << 6)
> > +#define DRM_FORMAT_MOD_VS_DEC_ALIGN_64      (0x01 << 7)
> > +
> > +#define fourcc_mod_vs_dec_code(tile, align) \
> > +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_COMPRESSED, \
> > +				((tile) | (align)))
> > +
> > +#define DRM_FORMAT_MOD_VS_NORM_MODE_MASK        0x1F
> > +#define DRM_FORMAT_MOD_VS_LINEAR                0x00
> > +#define DRM_FORMAT_MOD_VS_TILED4x4              0x01
> > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR    0x02
> > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR    0x03
> > +#define DRM_FORMAT_MOD_VS_TILE_8X8              0x04
> > +#define DRM_FORMAT_MOD_VS_TILE_MODE1            0x05
> > +#define DRM_FORMAT_MOD_VS_TILE_MODE2            0x06
> > +#define DRM_FORMAT_MOD_VS_TILE_8X4              0x07
> > +#define DRM_FORMAT_MOD_VS_TILE_MODE4            0x08
> > +#define DRM_FORMAT_MOD_VS_TILE_MODE5            0x09
> > +#define DRM_FORMAT_MOD_VS_TILE_MODE6            0x0A
> > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR_8X4    0x0B
> > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR_4X8    0x0C
> > +#define DRM_FORMAT_MOD_VS_TILE_Y                0x0D
> > +#define DRM_FORMAT_MOD_VS_TILE_128X1            0x0F
> > +#define DRM_FORMAT_MOD_VS_TILE_256X1            0x10
> > +#define DRM_FORMAT_MOD_VS_TILE_32X1             0x11
> > +#define DRM_FORMAT_MOD_VS_TILE_64X1             0x12
> > +#define DRM_FORMAT_MOD_VS_TILE_MODE4X4          0x15
> > +
> > +#define fourcc_mod_vs_norm_code(tile) \
> > +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_NORMAL, \
> > +				(tile))
> > +
> > +#define fourcc_mod_vs_custom_code(tile) \
> > +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT, \
> > +				(tile))
> > +
> >   #if defined(__cplusplus)
> >   }
> >   #endif
> > diff --git a/include/uapi/drm/vs_drm.h b/include/uapi/drm/vs_drm.h
> > new file mode 100644
> > index 000000000000..96b7fc95d658
> > --- /dev/null
> > +++ b/include/uapi/drm/vs_drm.h
> 
> Another UAPI addition that appears to be unused. Please only add things 
> that you're using.
> 
> Best regards
> Thomas
> 
> > @@ -0,0 +1,50 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> > +/*
> > + * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
> > + */
> > +
> > +#ifndef __VS_DRM_H__
> > +#define __VS_DRM_H__
> > +
> > +#include "drm.h"
> > +
> > +enum drm_vs_degamma_mode {
> > +	VS_DEGAMMA_DISABLE = 0,
> > +	VS_DEGAMMA_BT709 = 1,
> > +	VS_DEGAMMA_BT2020 = 2,
> > +};
> > +
> > +enum drm_vs_sync_dc_mode {
> > +	VS_SINGLE_DC = 0,
> > +	VS_MULTI_DC_PRIMARY = 1,
> > +	VS_MULTI_DC_SECONDARY = 2,
> > +};
> > +
> > +enum drm_vs_mmu_prefetch_mode {
> > +	VS_MMU_PREFETCH_DISABLE = 0,
> > +	VS_MMU_PREFETCH_ENABLE = 1,
> > +};
> > +
> > +struct drm_vs_watermark {
> > +	__u32 watermark;
> > +	__u8 qos_low;
> > +	__u8 qos_high;
> > +};
> > +
> > +struct drm_vs_color_mgmt {
> > +	__u32 colorkey;
> > +	__u32 colorkey_high;
> > +	__u32 clear_value;
> > +	bool  clear_enable;
> > +	bool  transparency;
> > +};
> > +
> > +struct drm_vs_roi {
> > +	bool enable;
> > +	__u16 roi_x;
> > +	__u16 roi_y;
> > +	__u16 roi_w;
> > +	__u16 roi_h;
> > +};
> > +
> > +#endif /* __VS_DRM_H__ */
> 
> -- 
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)
Thomas Zimmermann July 8, 2023, 7:11 p.m. UTC | #4 
Hi

Am 07.07.23 um 20:09 schrieb Nicolas Dufresne:
[...]
>>> +config DRM_VERISILICON
>>> +	tristate "DRM Support for VeriSilicon"
>>
>> Can you rename the driver and files? 'VeriSilicon' seems
>> unpronounceable. Simply 'StarFive' and starfive/ would be fine.
> 
> Are you sure you want to request this ? If the display controller is a
> Verisilicon design, it will be super odd to use on other SoC that aren't from
> StarFive. Think about STM network driver, which is DesignWare.

It's not a hard requirement. If that's the name, so be it.

Best regards
Thomas

> 
> Nicolas
> 
>>
>>> +	depends on DRM
>>> +	select DRM_KMS_HELPER
>>> +	select CMA
>>> +	select DMA_CMA
>>> +	help
>>> +	  Choose this option if you have a VeriSilicon soc chipset.
>>> +	  This driver provides VeriSilicon kernel mode
>>> +	  setting and buffer management. It does not
>>> +	  provide 2D or 3D acceleration.
>>> diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
>>> new file mode 100644
>>> index 000000000000..64ce1b26546c
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/verisilicon/Makefile
>>> @@ -0,0 +1,6 @@
>>> +# SPDX-License-Identifier: GPL-2.0
>>> +
>>> +vs_drm-objs := vs_drv.o
>>> +
>>> +obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
>>> +
>>> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
>>> new file mode 100644
>>> index 000000000000..24d333598477
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/verisilicon/vs_drv.c
>>> @@ -0,0 +1,284 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
>>> + */
>>> +
>>> +#include <linux/clk.h>
>>> +#include <linux/component.h>
>>> +#include <linux/delay.h>
>>> +#include <linux/dma-mapping.h>
>>> +#include <linux/iommu.h>
>>> +#include <linux/of_graph.h>
>>> +#include <linux/of_reserved_mem.h>
>>> +#include <linux/pm_runtime.h>
>>> +#include <linux/reset.h>
>>> +#include <linux/version.h>
>>> +
>>> +#include <drm/drm_aperture.h>
>>> +#include <drm/drm_crtc.h>
>>> +#include <drm/drm_crtc_helper.h>
>>> +#include <drm/drm_debugfs.h>
>>> +#include <drm/drm_drv.h>
>>> +#include <drm/drm_fb_helper.h>
>>> +#include <drm/drm_fbdev_generic.h>
>>> +#include <drm/drm_file.h>
>>> +#include <drm/drm_fourcc.h>
>>> +#include <drm/drm_ioctl.h>
>>> +#include <drm/drm_of.h>
>>> +#include <drm/drm_prime.h>
>>> +#include <drm/drm_probe_helper.h>
>>> +#include <drm/drm_vblank.h>
>>> +
>>> +#include "vs_drv.h"
>>> +
>>> +#define DRV_NAME	"starfive"
>>> +#define DRV_DESC	"Starfive DRM driver"
>>> +#define DRV_DATE	"202305161"
>>> +#define DRV_MAJOR	1
>>> +#define DRV_MINOR	0
>>> +
>>> +static struct platform_driver vs_drm_platform_driver;
>>> +
>>> +static const struct file_operations fops = {
>>> +	.owner			= THIS_MODULE,
>>> +	.open			= drm_open,
>>> +	.release		= drm_release,
>>> +	.unlocked_ioctl	= drm_ioctl,
>>> +	.compat_ioctl	= drm_compat_ioctl,
>>> +	.poll			= drm_poll,
>>> +	.read			= drm_read,
>>> +};
>>> +
>>> +static struct drm_driver vs_drm_driver = {
>>> +	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
>>> +	.lastclose		= drm_fb_helper_lastclose,
>>> +	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>>> +	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>>> +	.fops			= &fops,
>>> +	.name			= DRV_NAME,
>>> +	.desc			= DRV_DESC,
>>> +	.date			= DRV_DATE,
>>> +	.major			= DRV_MAJOR,
>>> +	.minor			= DRV_MINOR,
>>> +};
>>> +
>>> +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
>>> +				   unsigned int alignment)
>>> +{
>>> +	struct vs_drm_private *priv = drm_dev->dev_private;
>>> +
>>> +	if (alignment > priv->pitch_alignment)
>>> +		priv->pitch_alignment = alignment;
>>> +}
>>> +
>>> +static int vs_drm_bind(struct device *dev)
>>> +{
>>> +	struct drm_device *drm_dev;
>>> +	struct vs_drm_private *priv;
>>> +	int ret;
>>> +	static u64 dma_mask = DMA_BIT_MASK(40);
>>> +
>>> +	/* Remove existing drivers that may own the framebuffer memory. */
>>> +	ret = drm_aperture_remove_framebuffers(false, &vs_drm_driver);
>>> +	if (ret) {
>>> +		DRM_DEV_ERROR(dev,
>>
>> drm_err(), drm_info(), drm_warn(), etc.  Here and everwhere else. The
>> DRM_DEV_*() print macros are obsolete.
>>
>>> +			      "Failed to remove existing framebuffers - %d.\n",
>>> +			      ret);
>>> +		return ret;
>>> +	}
>>> +
>>> +	drm_dev = drm_dev_alloc(&vs_drm_driver, dev);
>>> +	if (IS_ERR(drm_dev))
>>> +		return PTR_ERR(drm_dev);
>>> +
>>> +	dev_set_drvdata(dev, drm_dev);
>>> +
>>> +	priv = devm_kzalloc(drm_dev->dev, sizeof(struct vs_drm_private),
>>> +			    GFP_KERNEL);
>>> +	if (!priv) {
>>> +		ret = -ENOMEM;
>>> +		goto err_put_dev;
>>> +	}
>>> +
>>> +	priv->pitch_alignment = 64;
>>> +	priv->dma_dev = drm_dev->dev;
>>> +	priv->dma_dev->coherent_dma_mask = dma_mask;
>>> +	drm_dev->dev_private = priv;
>>
>> dev_private is obsolete and about to go away at some point.
>>
>> Please embed drm_device in vs_drm_private and allocate the memory with
>> devm_drm_dev_alloc().
>>
>>> +
>>> +	drm_mode_config_init(drm_dev);
>>
>> drmm_mode_config_init() please.
>>
>>> +
>>> +	/* Now try and bind all our sub-components */
>>> +	ret = component_bind_all(dev, drm_dev);
>>> +	if (ret)
>>> +		goto err_mode;
>>> +
>>> +	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
>>> +	if (ret)
>>> +		goto err_bind;
>>> +
>>> +	drm_mode_config_reset(drm_dev);
>>> +
>>> +	drm_kms_helper_poll_init(drm_dev);
>>> +
>>> +	ret = drm_dev_register(drm_dev, 0);
>>> +	if (ret)
>>> +		goto err_helper;
>>> +
>>> +	drm_fbdev_generic_setup(drm_dev, 32);
>>> +
>>> +	return 0;
>>> +
>>> +err_helper:
>>> +	drm_kms_helper_poll_fini(drm_dev);
>>> +err_bind:
>>> +	component_unbind_all(drm_dev->dev, drm_dev);
>>> +err_mode:
>>> +	drm_mode_config_cleanup(drm_dev);
>>> +	if (priv->domain)
>>> +		iommu_domain_free(priv->domain);
>>> +err_put_dev:
>>> +	drm_dev->dev_private = NULL;
>>> +	dev_set_drvdata(dev, NULL);
>>> +	drm_dev_put(drm_dev);
>>> +	return ret;
>>> +}
>>> +
>>> +static void vs_drm_unbind(struct device *dev)
>>> +{
>>> +	struct drm_device *drm_dev = dev_get_drvdata(dev);
>>> +	struct vs_drm_private *priv = drm_dev->dev_private;
>>> +
>>> +	drm_dev_unregister(drm_dev);
>>> +
>>> +	drm_kms_helper_poll_fini(drm_dev);
>>> +
>>> +	component_unbind_all(drm_dev->dev, drm_dev);
>>> +
>>> +	drm_mode_config_cleanup(drm_dev);
>>> +
>>> +	if (priv->domain) {
>>> +		iommu_domain_free(priv->domain);
>>> +		priv->domain = NULL;
>>> +	}
>>> +
>>> +	drm_dev->dev_private = NULL;
>>> +	dev_set_drvdata(dev, NULL);
>>> +	drm_dev_put(drm_dev);
>>
>> You rather want to convert the individual steps of this cleanup to
>> managed functions (drmm_ and devm_) to automate the cleanup when as part
>> of drm_dev_put().
>>
>>> +}
>>> +
>>> +static const struct component_master_ops vs_drm_ops = {
>>> +	.bind = vs_drm_bind,
>>> +	.unbind = vs_drm_unbind,
>>> +};
>>> +
>>> +static struct platform_driver *drm_sub_drivers[] = {
>>> +};
>>> +
>>> +#define NUM_DRM_DRIVERS \
>>> +	(sizeof(drm_sub_drivers) / sizeof(struct platform_driver *))
>>
>> Does this really work? sizeof(drm_sub_drivers) isn't know at compile
>> time. It is always assumed to be 0 AFAICT. Or do you fill this array in
>> later patches?
>>
>>
>>> +
>>> +static int compare_dev(struct device *dev, void *data)
>>> +{
>>> +	return dev == (struct device *)data;
>>> +}
>>> +
>>> +static struct component_match *vs_drm_match_add(struct device *dev)
>>> +{
>>> +	struct component_match *match = NULL;
>>> +	int i;
>>> +
>>> +	for (i = 0; i < NUM_DRM_DRIVERS; ++i) {
>>> +		struct platform_driver *drv = drm_sub_drivers[i];
>>> +		struct device *p = NULL, *d;
>>> +
>>> +		while ((d = platform_find_device_by_driver(p, &drv->driver))) {
>>> +			put_device(p);
>>> +
>>> +			component_match_add(dev, &match, compare_dev, d);
>>> +			p = d;
>>> +		}
>>> +		put_device(p);
>>> +	}
>>> +
>>> +	return match ?: ERR_PTR(-ENODEV);
>>> +}
>>> +
>>> +static int vs_drm_platform_probe(struct platform_device *pdev)
>>> +{
>>> +	struct device *dev = &pdev->dev;
>>> +	struct component_match *match;
>>> +
>>> +	match = vs_drm_match_add(dev);
>>> +	if (IS_ERR(match))
>>> +		return PTR_ERR(match);
>>> +
>>> +	return component_master_add_with_match(dev, &vs_drm_ops, match);
>>> +}
>>> +
>>> +static int vs_drm_platform_remove(struct platform_device *pdev)
>>> +{
>>> +	component_master_del(&pdev->dev, &vs_drm_ops);
>>> +	return 0;
>>> +}
>>> +
>>> +#ifdef CONFIG_PM_SLEEP
>>> +static int vs_drm_suspend(struct device *dev)
>>> +{
>>> +	struct drm_device *drm = dev_get_drvdata(dev);
>>> +
>>> +	return drm_mode_config_helper_suspend(drm);
>>> +}
>>> +
>>> +static int vs_drm_resume(struct device *dev)
>>> +{
>>> +	struct drm_device *drm = dev_get_drvdata(dev);
>>> +
>>> +	return drm_mode_config_helper_resume(drm);
>>> +}
>>> +#endif
>>> +
>>> +static SIMPLE_DEV_PM_OPS(vs_drm_pm_ops, vs_drm_suspend, vs_drm_resume);
>>> +
>>> +static const struct of_device_id vs_drm_dt_ids[] = {
>>> +	{ .compatible = "verisilicon,display-subsystem", },
>>> +};
>>> +
>>> +MODULE_DEVICE_TABLE(of, vs_drm_dt_ids);
>>> +
>>> +static struct platform_driver vs_drm_platform_driver = {
>>> +	.probe = vs_drm_platform_probe,
>>> +	.remove = vs_drm_platform_remove,
>>> +
>>> +	.driver = {
>>> +		.name = DRV_NAME,
>>> +		.of_match_table = vs_drm_dt_ids,
>>> +		.pm = &vs_drm_pm_ops,
>>> +	},
>>> +};
>>> +
>>> +static int __init vs_drm_init(void)
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = platform_register_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
>>> +	if (ret)
>>> +		return ret;
>>> +
>>> +	ret = platform_driver_register(&vs_drm_platform_driver);
>>> +	if (ret)
>>> +		platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
>>> +
>>> +	return ret;
>>> +}
>>> +
>>> +static void __exit vs_drm_fini(void)
>>> +{
>>> +	platform_driver_unregister(&vs_drm_platform_driver);
>>> +	platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
>>> +}
>>> +
>>> +module_init(vs_drm_init);
>>> +module_exit(vs_drm_fini);
>>> +
>>> +MODULE_DESCRIPTION("VeriSilicon DRM Driver");
>>> +MODULE_LICENSE("GPL");
>>> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
>>> new file mode 100644
>>> index 000000000000..0382b44e3bf0
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/verisilicon/vs_drv.h
>>> @@ -0,0 +1,48 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +/*
>>> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
>>> + */
>>> +
>>> +#ifndef __VS_DRV_H__
>>> +#define __VS_DRV_H__
>>> +
>>> +#include <linux/module.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/version.h>
>>> +#include <drm/drm_drv.h>
>>> +#include <drm/drm_gem.h>
>>> +
>>> +/*
>>> + *
>>> + * @dma_dev: device for DMA API.
>>> + *	- use the first attached device if support iommu
>>> +	else use drm device (only contiguous buffer support)
>>> + * @domain: iommu domain for DRM.
>>> + *	- all DC IOMMU share same domain to reduce mapping
>>> + * @pitch_alignment: buffer pitch alignment required by sub-devices.
>>> + *
>>> + */
>>> +struct vs_drm_private {
>>> +	struct device *dma_dev;
>>> +	struct iommu_domain *domain;
>>> +	unsigned int pitch_alignment;
>>> +};
>>
>> As mentioned, this struct needs to embed struct drm_device.
>>
>>> +
>>> +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
>>> +				   unsigned int alignment);
>>> +
>>> +static inline struct device *to_dma_dev(struct drm_device *dev)
>>> +{
>>> +	struct vs_drm_private *priv = dev->dev_private;
>>> +
>>> +	return priv->dma_dev;
>>
>> And this needs to be an upcast via container_of().
>>
>>> +}
>>> +
>>> +static inline bool is_iommu_enabled(struct drm_device *dev)
>>> +{
>>> +	struct vs_drm_private *priv = dev->dev_private;
>>> +
>>> +	return priv->domain ? true : false;
>>> +}
>>> +
>>> +#endif /* __VS_DRV_H__ */
>>> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
>>> index de703c6be969..af4fb50f9207 100644
>>> --- a/include/uapi/drm/drm_fourcc.h
>>> +++ b/include/uapi/drm/drm_fourcc.h
>>
>> The UAPI changes shouldn't be needed in this patch?
>>
>>> @@ -419,6 +419,7 @@ extern "C" {
>>>    #define DRM_FORMAT_MOD_VENDOR_ARM     0x08
>>>    #define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
>>>    #define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a
>>> +#define DRM_FORMAT_MOD_VENDOR_VS      0x0b
>>>    
>>>    /* add more to the end as needed */
>>>    
>>> @@ -1519,6 +1520,88 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
>>>    #define AMD_FMT_MOD_CLEAR(field) \
>>>    	(~((__u64)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
>>>    
>>> +#define DRM_FORMAT_MOD_VS_TYPE_NORMAL        0x00
>>> +#define DRM_FORMAT_MOD_VS_TYPE_COMPRESSED    0x01
>>> +#define DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT  0x02
>>> +#define DRM_FORMAT_MOD_VS_TYPE_MASK     ((__u64)0x3 << 54)
>>> +
>>> +#define fourcc_mod_vs_code(type, val) \
>>> +	fourcc_mod_code(VS, ((((__u64)type) << 54) | (val)))
>>> +
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_MODE_MASK    0x3F
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_XMAJOR   0x00
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_YMAJOR   0x01
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4     0x02
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4      0x03
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_4X8      0x04
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X4   0x06
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_64X4     0x07
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4     0x08
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X1  0x09
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X1  0x0A
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X4   0x0B
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X2  0x0C
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X2  0x0D
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X4  0x0E
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X1   0x0F
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X8     0x10
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X16     0x11
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_512X1  0x12
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X4   0x13
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X2   0x14
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X2   0x15
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X1   0x16
>>> +#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X1   0x17
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_128X4    0x18
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_256X4    0x19
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_512X4    0x1A
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X16    0x1B
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X16    0x1C
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_64X16    0x1D
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_128X8    0x1E
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4_S    0x1F
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_S   0x20
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_S   0x21
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_LSB 0x22
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_LSB 0x23
>>> +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X8     0x24
>>> +
>>> +#define DRM_FORMAT_MOD_VS_DEC_ALIGN_32      (0x01 << 6)
>>> +#define DRM_FORMAT_MOD_VS_DEC_ALIGN_64      (0x01 << 7)
>>> +
>>> +#define fourcc_mod_vs_dec_code(tile, align) \
>>> +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_COMPRESSED, \
>>> +				((tile) | (align)))
>>> +
>>> +#define DRM_FORMAT_MOD_VS_NORM_MODE_MASK        0x1F
>>> +#define DRM_FORMAT_MOD_VS_LINEAR                0x00
>>> +#define DRM_FORMAT_MOD_VS_TILED4x4              0x01
>>> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR    0x02
>>> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR    0x03
>>> +#define DRM_FORMAT_MOD_VS_TILE_8X8              0x04
>>> +#define DRM_FORMAT_MOD_VS_TILE_MODE1            0x05
>>> +#define DRM_FORMAT_MOD_VS_TILE_MODE2            0x06
>>> +#define DRM_FORMAT_MOD_VS_TILE_8X4              0x07
>>> +#define DRM_FORMAT_MOD_VS_TILE_MODE4            0x08
>>> +#define DRM_FORMAT_MOD_VS_TILE_MODE5            0x09
>>> +#define DRM_FORMAT_MOD_VS_TILE_MODE6            0x0A
>>> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR_8X4    0x0B
>>> +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR_4X8    0x0C
>>> +#define DRM_FORMAT_MOD_VS_TILE_Y                0x0D
>>> +#define DRM_FORMAT_MOD_VS_TILE_128X1            0x0F
>>> +#define DRM_FORMAT_MOD_VS_TILE_256X1            0x10
>>> +#define DRM_FORMAT_MOD_VS_TILE_32X1             0x11
>>> +#define DRM_FORMAT_MOD_VS_TILE_64X1             0x12
>>> +#define DRM_FORMAT_MOD_VS_TILE_MODE4X4          0x15
>>> +
>>> +#define fourcc_mod_vs_norm_code(tile) \
>>> +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_NORMAL, \
>>> +				(tile))
>>> +
>>> +#define fourcc_mod_vs_custom_code(tile) \
>>> +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT, \
>>> +				(tile))
>>> +
>>>    #if defined(__cplusplus)
>>>    }
>>>    #endif
>>> diff --git a/include/uapi/drm/vs_drm.h b/include/uapi/drm/vs_drm.h
>>> new file mode 100644
>>> index 000000000000..96b7fc95d658
>>> --- /dev/null
>>> +++ b/include/uapi/drm/vs_drm.h
>>
>> Another UAPI addition that appears to be unused. Please only add things
>> that you're using.
>>
>> Best regards
>> Thomas
>>
>>> @@ -0,0 +1,50 @@
>>> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
>>> +/*
>>> + * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
>>> + */
>>> +
>>> +#ifndef __VS_DRM_H__
>>> +#define __VS_DRM_H__
>>> +
>>> +#include "drm.h"
>>> +
>>> +enum drm_vs_degamma_mode {
>>> +	VS_DEGAMMA_DISABLE = 0,
>>> +	VS_DEGAMMA_BT709 = 1,
>>> +	VS_DEGAMMA_BT2020 = 2,
>>> +};
>>> +
>>> +enum drm_vs_sync_dc_mode {
>>> +	VS_SINGLE_DC = 0,
>>> +	VS_MULTI_DC_PRIMARY = 1,
>>> +	VS_MULTI_DC_SECONDARY = 2,
>>> +};
>>> +
>>> +enum drm_vs_mmu_prefetch_mode {
>>> +	VS_MMU_PREFETCH_DISABLE = 0,
>>> +	VS_MMU_PREFETCH_ENABLE = 1,
>>> +};
>>> +
>>> +struct drm_vs_watermark {
>>> +	__u32 watermark;
>>> +	__u8 qos_low;
>>> +	__u8 qos_high;
>>> +};
>>> +
>>> +struct drm_vs_color_mgmt {
>>> +	__u32 colorkey;
>>> +	__u32 colorkey_high;
>>> +	__u32 clear_value;
>>> +	bool  clear_enable;
>>> +	bool  transparency;
>>> +};
>>> +
>>> +struct drm_vs_roi {
>>> +	bool enable;
>>> +	__u16 roi_x;
>>> +	__u16 roi_y;
>>> +	__u16 roi_w;
>>> +	__u16 roi_h;
>>> +};
>>> +
>>> +#endif /* __VS_DRM_H__ */
>>
>> -- 
>> Thomas Zimmermann
>> Graphics Driver Developer
>> SUSE Software Solutions Germany GmbH
>> Frankenstrasse 146, 90461 Nuernberg, Germany
>> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
>> HRB 36809 (AG Nuernberg)
>
Nicolas Dufresne July 13, 2023, 3:14 p.m. UTC | #5 
Le samedi 08 juillet 2023 à 21:11 +0200, Thomas Zimmermann a écrit :
> Hi
> 
> Am 07.07.23 um 20:09 schrieb Nicolas Dufresne:
> [...]
> > > > +config DRM_VERISILICON
> > > > +	tristate "DRM Support for VeriSilicon"
> > > 
> > > Can you rename the driver and files? 'VeriSilicon' seems
> > > unpronounceable. Simply 'StarFive' and starfive/ would be fine.
> > 
> > Are you sure you want to request this ? If the display controller is a
> > Verisilicon design, it will be super odd to use on other SoC that aren't from
> > StarFive. Think about STM network driver, which is DesignWare.
> 
> It's not a hard requirement. If that's the name, so be it.

If that helps you pronouncing this, it is commonly pronounced has:

  very-silicon

Or just a caulking mess if you really hate it :-D

Nicolas

> 
> Best regards
> Thomas
> 
> > 
> > Nicolas
> > 
> > > 
> > > > +	depends on DRM
> > > > +	select DRM_KMS_HELPER
> > > > +	select CMA
> > > > +	select DMA_CMA
> > > > +	help
> > > > +	  Choose this option if you have a VeriSilicon soc chipset.
> > > > +	  This driver provides VeriSilicon kernel mode
> > > > +	  setting and buffer management. It does not
> > > > +	  provide 2D or 3D acceleration.
> > > > diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
> > > > new file mode 100644
> > > > index 000000000000..64ce1b26546c
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/verisilicon/Makefile
> > > > @@ -0,0 +1,6 @@
> > > > +# SPDX-License-Identifier: GPL-2.0
> > > > +
> > > > +vs_drm-objs := vs_drv.o
> > > > +
> > > > +obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
> > > > +
> > > > diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
> > > > new file mode 100644
> > > > index 000000000000..24d333598477
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/verisilicon/vs_drv.c
> > > > @@ -0,0 +1,284 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +/*
> > > > + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> > > > + */
> > > > +
> > > > +#include <linux/clk.h>
> > > > +#include <linux/component.h>
> > > > +#include <linux/delay.h>
> > > > +#include <linux/dma-mapping.h>
> > > > +#include <linux/iommu.h>
> > > > +#include <linux/of_graph.h>
> > > > +#include <linux/of_reserved_mem.h>
> > > > +#include <linux/pm_runtime.h>
> > > > +#include <linux/reset.h>
> > > > +#include <linux/version.h>
> > > > +
> > > > +#include <drm/drm_aperture.h>
> > > > +#include <drm/drm_crtc.h>
> > > > +#include <drm/drm_crtc_helper.h>
> > > > +#include <drm/drm_debugfs.h>
> > > > +#include <drm/drm_drv.h>
> > > > +#include <drm/drm_fb_helper.h>
> > > > +#include <drm/drm_fbdev_generic.h>
> > > > +#include <drm/drm_file.h>
> > > > +#include <drm/drm_fourcc.h>
> > > > +#include <drm/drm_ioctl.h>
> > > > +#include <drm/drm_of.h>
> > > > +#include <drm/drm_prime.h>
> > > > +#include <drm/drm_probe_helper.h>
> > > > +#include <drm/drm_vblank.h>
> > > > +
> > > > +#include "vs_drv.h"
> > > > +
> > > > +#define DRV_NAME	"starfive"
> > > > +#define DRV_DESC	"Starfive DRM driver"
> > > > +#define DRV_DATE	"202305161"
> > > > +#define DRV_MAJOR	1
> > > > +#define DRV_MINOR	0
> > > > +
> > > > +static struct platform_driver vs_drm_platform_driver;
> > > > +
> > > > +static const struct file_operations fops = {
> > > > +	.owner			= THIS_MODULE,
> > > > +	.open			= drm_open,
> > > > +	.release		= drm_release,
> > > > +	.unlocked_ioctl	= drm_ioctl,
> > > > +	.compat_ioctl	= drm_compat_ioctl,
> > > > +	.poll			= drm_poll,
> > > > +	.read			= drm_read,
> > > > +};
> > > > +
> > > > +static struct drm_driver vs_drm_driver = {
> > > > +	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
> > > > +	.lastclose		= drm_fb_helper_lastclose,
> > > > +	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> > > > +	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> > > > +	.fops			= &fops,
> > > > +	.name			= DRV_NAME,
> > > > +	.desc			= DRV_DESC,
> > > > +	.date			= DRV_DATE,
> > > > +	.major			= DRV_MAJOR,
> > > > +	.minor			= DRV_MINOR,
> > > > +};
> > > > +
> > > > +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
> > > > +				   unsigned int alignment)
> > > > +{
> > > > +	struct vs_drm_private *priv = drm_dev->dev_private;
> > > > +
> > > > +	if (alignment > priv->pitch_alignment)
> > > > +		priv->pitch_alignment = alignment;
> > > > +}
> > > > +
> > > > +static int vs_drm_bind(struct device *dev)
> > > > +{
> > > > +	struct drm_device *drm_dev;
> > > > +	struct vs_drm_private *priv;
> > > > +	int ret;
> > > > +	static u64 dma_mask = DMA_BIT_MASK(40);
> > > > +
> > > > +	/* Remove existing drivers that may own the framebuffer memory. */
> > > > +	ret = drm_aperture_remove_framebuffers(false, &vs_drm_driver);
> > > > +	if (ret) {
> > > > +		DRM_DEV_ERROR(dev,
> > > 
> > > drm_err(), drm_info(), drm_warn(), etc.  Here and everwhere else. The
> > > DRM_DEV_*() print macros are obsolete.
> > > 
> > > > +			      "Failed to remove existing framebuffers - %d.\n",
> > > > +			      ret);
> > > > +		return ret;
> > > > +	}
> > > > +
> > > > +	drm_dev = drm_dev_alloc(&vs_drm_driver, dev);
> > > > +	if (IS_ERR(drm_dev))
> > > > +		return PTR_ERR(drm_dev);
> > > > +
> > > > +	dev_set_drvdata(dev, drm_dev);
> > > > +
> > > > +	priv = devm_kzalloc(drm_dev->dev, sizeof(struct vs_drm_private),
> > > > +			    GFP_KERNEL);
> > > > +	if (!priv) {
> > > > +		ret = -ENOMEM;
> > > > +		goto err_put_dev;
> > > > +	}
> > > > +
> > > > +	priv->pitch_alignment = 64;
> > > > +	priv->dma_dev = drm_dev->dev;
> > > > +	priv->dma_dev->coherent_dma_mask = dma_mask;
> > > > +	drm_dev->dev_private = priv;
> > > 
> > > dev_private is obsolete and about to go away at some point.
> > > 
> > > Please embed drm_device in vs_drm_private and allocate the memory with
> > > devm_drm_dev_alloc().
> > > 
> > > > +
> > > > +	drm_mode_config_init(drm_dev);
> > > 
> > > drmm_mode_config_init() please.
> > > 
> > > > +
> > > > +	/* Now try and bind all our sub-components */
> > > > +	ret = component_bind_all(dev, drm_dev);
> > > > +	if (ret)
> > > > +		goto err_mode;
> > > > +
> > > > +	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
> > > > +	if (ret)
> > > > +		goto err_bind;
> > > > +
> > > > +	drm_mode_config_reset(drm_dev);
> > > > +
> > > > +	drm_kms_helper_poll_init(drm_dev);
> > > > +
> > > > +	ret = drm_dev_register(drm_dev, 0);
> > > > +	if (ret)
> > > > +		goto err_helper;
> > > > +
> > > > +	drm_fbdev_generic_setup(drm_dev, 32);
> > > > +
> > > > +	return 0;
> > > > +
> > > > +err_helper:
> > > > +	drm_kms_helper_poll_fini(drm_dev);
> > > > +err_bind:
> > > > +	component_unbind_all(drm_dev->dev, drm_dev);
> > > > +err_mode:
> > > > +	drm_mode_config_cleanup(drm_dev);
> > > > +	if (priv->domain)
> > > > +		iommu_domain_free(priv->domain);
> > > > +err_put_dev:
> > > > +	drm_dev->dev_private = NULL;
> > > > +	dev_set_drvdata(dev, NULL);
> > > > +	drm_dev_put(drm_dev);
> > > > +	return ret;
> > > > +}
> > > > +
> > > > +static void vs_drm_unbind(struct device *dev)
> > > > +{
> > > > +	struct drm_device *drm_dev = dev_get_drvdata(dev);
> > > > +	struct vs_drm_private *priv = drm_dev->dev_private;
> > > > +
> > > > +	drm_dev_unregister(drm_dev);
> > > > +
> > > > +	drm_kms_helper_poll_fini(drm_dev);
> > > > +
> > > > +	component_unbind_all(drm_dev->dev, drm_dev);
> > > > +
> > > > +	drm_mode_config_cleanup(drm_dev);
> > > > +
> > > > +	if (priv->domain) {
> > > > +		iommu_domain_free(priv->domain);
> > > > +		priv->domain = NULL;
> > > > +	}
> > > > +
> > > > +	drm_dev->dev_private = NULL;
> > > > +	dev_set_drvdata(dev, NULL);
> > > > +	drm_dev_put(drm_dev);
> > > 
> > > You rather want to convert the individual steps of this cleanup to
> > > managed functions (drmm_ and devm_) to automate the cleanup when as part
> > > of drm_dev_put().
> > > 
> > > > +}
> > > > +
> > > > +static const struct component_master_ops vs_drm_ops = {
> > > > +	.bind = vs_drm_bind,
> > > > +	.unbind = vs_drm_unbind,
> > > > +};
> > > > +
> > > > +static struct platform_driver *drm_sub_drivers[] = {
> > > > +};
> > > > +
> > > > +#define NUM_DRM_DRIVERS \
> > > > +	(sizeof(drm_sub_drivers) / sizeof(struct platform_driver *))
> > > 
> > > Does this really work? sizeof(drm_sub_drivers) isn't know at compile
> > > time. It is always assumed to be 0 AFAICT. Or do you fill this array in
> > > later patches?
> > > 
> > > 
> > > > +
> > > > +static int compare_dev(struct device *dev, void *data)
> > > > +{
> > > > +	return dev == (struct device *)data;
> > > > +}
> > > > +
> > > > +static struct component_match *vs_drm_match_add(struct device *dev)
> > > > +{
> > > > +	struct component_match *match = NULL;
> > > > +	int i;
> > > > +
> > > > +	for (i = 0; i < NUM_DRM_DRIVERS; ++i) {
> > > > +		struct platform_driver *drv = drm_sub_drivers[i];
> > > > +		struct device *p = NULL, *d;
> > > > +
> > > > +		while ((d = platform_find_device_by_driver(p, &drv->driver))) {
> > > > +			put_device(p);
> > > > +
> > > > +			component_match_add(dev, &match, compare_dev, d);
> > > > +			p = d;
> > > > +		}
> > > > +		put_device(p);
> > > > +	}
> > > > +
> > > > +	return match ?: ERR_PTR(-ENODEV);
> > > > +}
> > > > +
> > > > +static int vs_drm_platform_probe(struct platform_device *pdev)
> > > > +{
> > > > +	struct device *dev = &pdev->dev;
> > > > +	struct component_match *match;
> > > > +
> > > > +	match = vs_drm_match_add(dev);
> > > > +	if (IS_ERR(match))
> > > > +		return PTR_ERR(match);
> > > > +
> > > > +	return component_master_add_with_match(dev, &vs_drm_ops, match);
> > > > +}
> > > > +
> > > > +static int vs_drm_platform_remove(struct platform_device *pdev)
> > > > +{
> > > > +	component_master_del(&pdev->dev, &vs_drm_ops);
> > > > +	return 0;
> > > > +}
> > > > +
> > > > +#ifdef CONFIG_PM_SLEEP
> > > > +static int vs_drm_suspend(struct device *dev)
> > > > +{
> > > > +	struct drm_device *drm = dev_get_drvdata(dev);
> > > > +
> > > > +	return drm_mode_config_helper_suspend(drm);
> > > > +}
> > > > +
> > > > +static int vs_drm_resume(struct device *dev)
> > > > +{
> > > > +	struct drm_device *drm = dev_get_drvdata(dev);
> > > > +
> > > > +	return drm_mode_config_helper_resume(drm);
> > > > +}
> > > > +#endif
> > > > +
> > > > +static SIMPLE_DEV_PM_OPS(vs_drm_pm_ops, vs_drm_suspend, vs_drm_resume);
> > > > +
> > > > +static const struct of_device_id vs_drm_dt_ids[] = {
> > > > +	{ .compatible = "verisilicon,display-subsystem", },
> > > > +};
> > > > +
> > > > +MODULE_DEVICE_TABLE(of, vs_drm_dt_ids);
> > > > +
> > > > +static struct platform_driver vs_drm_platform_driver = {
> > > > +	.probe = vs_drm_platform_probe,
> > > > +	.remove = vs_drm_platform_remove,
> > > > +
> > > > +	.driver = {
> > > > +		.name = DRV_NAME,
> > > > +		.of_match_table = vs_drm_dt_ids,
> > > > +		.pm = &vs_drm_pm_ops,
> > > > +	},
> > > > +};
> > > > +
> > > > +static int __init vs_drm_init(void)
> > > > +{
> > > > +	int ret;
> > > > +
> > > > +	ret = platform_register_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> > > > +	if (ret)
> > > > +		return ret;
> > > > +
> > > > +	ret = platform_driver_register(&vs_drm_platform_driver);
> > > > +	if (ret)
> > > > +		platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> > > > +
> > > > +	return ret;
> > > > +}
> > > > +
> > > > +static void __exit vs_drm_fini(void)
> > > > +{
> > > > +	platform_driver_unregister(&vs_drm_platform_driver);
> > > > +	platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> > > > +}
> > > > +
> > > > +module_init(vs_drm_init);
> > > > +module_exit(vs_drm_fini);
> > > > +
> > > > +MODULE_DESCRIPTION("VeriSilicon DRM Driver");
> > > > +MODULE_LICENSE("GPL");
> > > > diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
> > > > new file mode 100644
> > > > index 000000000000..0382b44e3bf0
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/verisilicon/vs_drv.h
> > > > @@ -0,0 +1,48 @@
> > > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > > +/*
> > > > + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> > > > + */
> > > > +
> > > > +#ifndef __VS_DRV_H__
> > > > +#define __VS_DRV_H__
> > > > +
> > > > +#include <linux/module.h>
> > > > +#include <linux/platform_device.h>
> > > > +#include <linux/version.h>
> > > > +#include <drm/drm_drv.h>
> > > > +#include <drm/drm_gem.h>
> > > > +
> > > > +/*
> > > > + *
> > > > + * @dma_dev: device for DMA API.
> > > > + *	- use the first attached device if support iommu
> > > > +	else use drm device (only contiguous buffer support)
> > > > + * @domain: iommu domain for DRM.
> > > > + *	- all DC IOMMU share same domain to reduce mapping
> > > > + * @pitch_alignment: buffer pitch alignment required by sub-devices.
> > > > + *
> > > > + */
> > > > +struct vs_drm_private {
> > > > +	struct device *dma_dev;
> > > > +	struct iommu_domain *domain;
> > > > +	unsigned int pitch_alignment;
> > > > +};
> > > 
> > > As mentioned, this struct needs to embed struct drm_device.
> > > 
> > > > +
> > > > +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
> > > > +				   unsigned int alignment);
> > > > +
> > > > +static inline struct device *to_dma_dev(struct drm_device *dev)
> > > > +{
> > > > +	struct vs_drm_private *priv = dev->dev_private;
> > > > +
> > > > +	return priv->dma_dev;
> > > 
> > > And this needs to be an upcast via container_of().
> > > 
> > > > +}
> > > > +
> > > > +static inline bool is_iommu_enabled(struct drm_device *dev)
> > > > +{
> > > > +	struct vs_drm_private *priv = dev->dev_private;
> > > > +
> > > > +	return priv->domain ? true : false;
> > > > +}
> > > > +
> > > > +#endif /* __VS_DRV_H__ */
> > > > diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> > > > index de703c6be969..af4fb50f9207 100644
> > > > --- a/include/uapi/drm/drm_fourcc.h
> > > > +++ b/include/uapi/drm/drm_fourcc.h
> > > 
> > > The UAPI changes shouldn't be needed in this patch?
> > > 
> > > > @@ -419,6 +419,7 @@ extern "C" {
> > > >    #define DRM_FORMAT_MOD_VENDOR_ARM     0x08
> > > >    #define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
> > > >    #define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a
> > > > +#define DRM_FORMAT_MOD_VENDOR_VS      0x0b
> > > >    
> > > >    /* add more to the end as needed */
> > > >    
> > > > @@ -1519,6 +1520,88 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
> > > >    #define AMD_FMT_MOD_CLEAR(field) \
> > > >    	(~((__u64)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
> > > >    
> > > > +#define DRM_FORMAT_MOD_VS_TYPE_NORMAL        0x00
> > > > +#define DRM_FORMAT_MOD_VS_TYPE_COMPRESSED    0x01
> > > > +#define DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT  0x02
> > > > +#define DRM_FORMAT_MOD_VS_TYPE_MASK     ((__u64)0x3 << 54)
> > > > +
> > > > +#define fourcc_mod_vs_code(type, val) \
> > > > +	fourcc_mod_code(VS, ((((__u64)type) << 54) | (val)))
> > > > +
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_MODE_MASK    0x3F
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_XMAJOR   0x00
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_YMAJOR   0x01
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4     0x02
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4      0x03
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_4X8      0x04
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X4   0x06
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_64X4     0x07
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4     0x08
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X1  0x09
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X1  0x0A
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X4   0x0B
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X2  0x0C
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X2  0x0D
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X4  0x0E
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X1   0x0F
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X8     0x10
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X16     0x11
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_512X1  0x12
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X4   0x13
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X2   0x14
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X2   0x15
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X1   0x16
> > > > +#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X1   0x17
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_128X4    0x18
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_256X4    0x19
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_512X4    0x1A
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X16    0x1B
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X16    0x1C
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_64X16    0x1D
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_128X8    0x1E
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4_S    0x1F
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_S   0x20
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_S   0x21
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_LSB 0x22
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_LSB 0x23
> > > > +#define DRM_FORMAT_MOD_VS_DEC_TILE_32X8     0x24
> > > > +
> > > > +#define DRM_FORMAT_MOD_VS_DEC_ALIGN_32      (0x01 << 6)
> > > > +#define DRM_FORMAT_MOD_VS_DEC_ALIGN_64      (0x01 << 7)
> > > > +
> > > > +#define fourcc_mod_vs_dec_code(tile, align) \
> > > > +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_COMPRESSED, \
> > > > +				((tile) | (align)))
> > > > +
> > > > +#define DRM_FORMAT_MOD_VS_NORM_MODE_MASK        0x1F
> > > > +#define DRM_FORMAT_MOD_VS_LINEAR                0x00
> > > > +#define DRM_FORMAT_MOD_VS_TILED4x4              0x01
> > > > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR    0x02
> > > > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR    0x03
> > > > +#define DRM_FORMAT_MOD_VS_TILE_8X8              0x04
> > > > +#define DRM_FORMAT_MOD_VS_TILE_MODE1            0x05
> > > > +#define DRM_FORMAT_MOD_VS_TILE_MODE2            0x06
> > > > +#define DRM_FORMAT_MOD_VS_TILE_8X4              0x07
> > > > +#define DRM_FORMAT_MOD_VS_TILE_MODE4            0x08
> > > > +#define DRM_FORMAT_MOD_VS_TILE_MODE5            0x09
> > > > +#define DRM_FORMAT_MOD_VS_TILE_MODE6            0x0A
> > > > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR_8X4    0x0B
> > > > +#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR_4X8    0x0C
> > > > +#define DRM_FORMAT_MOD_VS_TILE_Y                0x0D
> > > > +#define DRM_FORMAT_MOD_VS_TILE_128X1            0x0F
> > > > +#define DRM_FORMAT_MOD_VS_TILE_256X1            0x10
> > > > +#define DRM_FORMAT_MOD_VS_TILE_32X1             0x11
> > > > +#define DRM_FORMAT_MOD_VS_TILE_64X1             0x12
> > > > +#define DRM_FORMAT_MOD_VS_TILE_MODE4X4          0x15
> > > > +
> > > > +#define fourcc_mod_vs_norm_code(tile) \
> > > > +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_NORMAL, \
> > > > +				(tile))
> > > > +
> > > > +#define fourcc_mod_vs_custom_code(tile) \
> > > > +	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT, \
> > > > +				(tile))
> > > > +
> > > >    #if defined(__cplusplus)
> > > >    }
> > > >    #endif
> > > > diff --git a/include/uapi/drm/vs_drm.h b/include/uapi/drm/vs_drm.h
> > > > new file mode 100644
> > > > index 000000000000..96b7fc95d658
> > > > --- /dev/null
> > > > +++ b/include/uapi/drm/vs_drm.h
> > > 
> > > Another UAPI addition that appears to be unused. Please only add things
> > > that you're using.
> > > 
> > > Best regards
> > > Thomas
> > > 
> > > > @@ -0,0 +1,50 @@
> > > > +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> > > > +/*
> > > > + * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
> > > > + */
> > > > +
> > > > +#ifndef __VS_DRM_H__
> > > > +#define __VS_DRM_H__
> > > > +
> > > > +#include "drm.h"
> > > > +
> > > > +enum drm_vs_degamma_mode {
> > > > +	VS_DEGAMMA_DISABLE = 0,
> > > > +	VS_DEGAMMA_BT709 = 1,
> > > > +	VS_DEGAMMA_BT2020 = 2,
> > > > +};
> > > > +
> > > > +enum drm_vs_sync_dc_mode {
> > > > +	VS_SINGLE_DC = 0,
> > > > +	VS_MULTI_DC_PRIMARY = 1,
> > > > +	VS_MULTI_DC_SECONDARY = 2,
> > > > +};
> > > > +
> > > > +enum drm_vs_mmu_prefetch_mode {
> > > > +	VS_MMU_PREFETCH_DISABLE = 0,
> > > > +	VS_MMU_PREFETCH_ENABLE = 1,
> > > > +};
> > > > +
> > > > +struct drm_vs_watermark {
> > > > +	__u32 watermark;
> > > > +	__u8 qos_low;
> > > > +	__u8 qos_high;
> > > > +};
> > > > +
> > > > +struct drm_vs_color_mgmt {
> > > > +	__u32 colorkey;
> > > > +	__u32 colorkey_high;
> > > > +	__u32 clear_value;
> > > > +	bool  clear_enable;
> > > > +	bool  transparency;
> > > > +};
> > > > +
> > > > +struct drm_vs_roi {
> > > > +	bool enable;
> > > > +	__u16 roi_x;
> > > > +	__u16 roi_y;
> > > > +	__u16 roi_w;
> > > > +	__u16 roi_h;
> > > > +};
> > > > +
> > > > +#endif /* __VS_DRM_H__ */
> > > 
> > > -- 
> > > Thomas Zimmermann
> > > Graphics Driver Developer
> > > SUSE Software Solutions Germany GmbH
> > > Frankenstrasse 146, 90461 Nuernberg, Germany
> > > GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> > > HRB 36809 (AG Nuernberg)
> > 
> 
> -- 
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 293aa13d484c..da5b6766a7bb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7055,6 +7055,8 @@  L:	dri-devel@lists.freedesktop.org
 S:	Maintained
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/verisilicon/
+F:	drivers/gpu/drm/verisilicon/
+F:	include/uapi/drm/vs_drm.h
 
 DRM DRIVERS FOR VIVANTE GPU IP
 M:	Lucas Stach <l.stach@pengutronix.de>
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index ba3fb04bb691..f7e461fa4656 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -371,6 +371,8 @@  source "drivers/gpu/drm/solomon/Kconfig"
 
 source "drivers/gpu/drm/sprd/Kconfig"
 
+source "drivers/gpu/drm/verisilicon/Kconfig"
+
 config DRM_HYPERV
 	tristate "DRM Support for Hyper-V synthetic video device"
 	depends on DRM && PCI && MMU && HYPERV
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index a33257d2bc7f..e50622ee4e46 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -194,3 +194,4 @@  obj-y			+= gud/
 obj-$(CONFIG_DRM_HYPERV) += hyperv/
 obj-y			+= solomon/
 obj-$(CONFIG_DRM_SPRD) += sprd/
+obj-$(CONFIG_DRM_VERISILICON) += verisilicon/
diff --git a/drivers/gpu/drm/verisilicon/Kconfig b/drivers/gpu/drm/verisilicon/Kconfig
new file mode 100644
index 000000000000..89d12185f73b
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/Kconfig
@@ -0,0 +1,13 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config DRM_VERISILICON
+	tristate "DRM Support for VeriSilicon"
+	depends on DRM
+	select DRM_KMS_HELPER
+	select CMA
+	select DMA_CMA
+	help
+	  Choose this option if you have a VeriSilicon soc chipset.
+	  This driver provides VeriSilicon kernel mode
+	  setting and buffer management. It does not
+	  provide 2D or 3D acceleration.
diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
new file mode 100644
index 000000000000..64ce1b26546c
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/Makefile
@@ -0,0 +1,6 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+vs_drm-objs := vs_drv.o
+
+obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
+
diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
new file mode 100644
index 000000000000..24d333598477
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_drv.c
@@ -0,0 +1,284 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/iommu.h>
+#include <linux/of_graph.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/version.h>
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_debugfs.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fbdev_generic.h>
+#include <drm/drm_file.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_of.h>
+#include <drm/drm_prime.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "vs_drv.h"
+
+#define DRV_NAME	"starfive"
+#define DRV_DESC	"Starfive DRM driver"
+#define DRV_DATE	"202305161"
+#define DRV_MAJOR	1
+#define DRV_MINOR	0
+
+static struct platform_driver vs_drm_platform_driver;
+
+static const struct file_operations fops = {
+	.owner			= THIS_MODULE,
+	.open			= drm_open,
+	.release		= drm_release,
+	.unlocked_ioctl	= drm_ioctl,
+	.compat_ioctl	= drm_compat_ioctl,
+	.poll			= drm_poll,
+	.read			= drm_read,
+};
+
+static struct drm_driver vs_drm_driver = {
+	.driver_features	= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
+	.lastclose		= drm_fb_helper_lastclose,
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.fops			= &fops,
+	.name			= DRV_NAME,
+	.desc			= DRV_DESC,
+	.date			= DRV_DATE,
+	.major			= DRV_MAJOR,
+	.minor			= DRV_MINOR,
+};
+
+void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
+				   unsigned int alignment)
+{
+	struct vs_drm_private *priv = drm_dev->dev_private;
+
+	if (alignment > priv->pitch_alignment)
+		priv->pitch_alignment = alignment;
+}
+
+static int vs_drm_bind(struct device *dev)
+{
+	struct drm_device *drm_dev;
+	struct vs_drm_private *priv;
+	int ret;
+	static u64 dma_mask = DMA_BIT_MASK(40);
+
+	/* Remove existing drivers that may own the framebuffer memory. */
+	ret = drm_aperture_remove_framebuffers(false, &vs_drm_driver);
+	if (ret) {
+		DRM_DEV_ERROR(dev,
+			      "Failed to remove existing framebuffers - %d.\n",
+			      ret);
+		return ret;
+	}
+
+	drm_dev = drm_dev_alloc(&vs_drm_driver, dev);
+	if (IS_ERR(drm_dev))
+		return PTR_ERR(drm_dev);
+
+	dev_set_drvdata(dev, drm_dev);
+
+	priv = devm_kzalloc(drm_dev->dev, sizeof(struct vs_drm_private),
+			    GFP_KERNEL);
+	if (!priv) {
+		ret = -ENOMEM;
+		goto err_put_dev;
+	}
+
+	priv->pitch_alignment = 64;
+	priv->dma_dev = drm_dev->dev;
+	priv->dma_dev->coherent_dma_mask = dma_mask;
+	drm_dev->dev_private = priv;
+
+	drm_mode_config_init(drm_dev);
+
+	/* Now try and bind all our sub-components */
+	ret = component_bind_all(dev, drm_dev);
+	if (ret)
+		goto err_mode;
+
+	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
+	if (ret)
+		goto err_bind;
+
+	drm_mode_config_reset(drm_dev);
+
+	drm_kms_helper_poll_init(drm_dev);
+
+	ret = drm_dev_register(drm_dev, 0);
+	if (ret)
+		goto err_helper;
+
+	drm_fbdev_generic_setup(drm_dev, 32);
+
+	return 0;
+
+err_helper:
+	drm_kms_helper_poll_fini(drm_dev);
+err_bind:
+	component_unbind_all(drm_dev->dev, drm_dev);
+err_mode:
+	drm_mode_config_cleanup(drm_dev);
+	if (priv->domain)
+		iommu_domain_free(priv->domain);
+err_put_dev:
+	drm_dev->dev_private = NULL;
+	dev_set_drvdata(dev, NULL);
+	drm_dev_put(drm_dev);
+	return ret;
+}
+
+static void vs_drm_unbind(struct device *dev)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct vs_drm_private *priv = drm_dev->dev_private;
+
+	drm_dev_unregister(drm_dev);
+
+	drm_kms_helper_poll_fini(drm_dev);
+
+	component_unbind_all(drm_dev->dev, drm_dev);
+
+	drm_mode_config_cleanup(drm_dev);
+
+	if (priv->domain) {
+		iommu_domain_free(priv->domain);
+		priv->domain = NULL;
+	}
+
+	drm_dev->dev_private = NULL;
+	dev_set_drvdata(dev, NULL);
+	drm_dev_put(drm_dev);
+}
+
+static const struct component_master_ops vs_drm_ops = {
+	.bind = vs_drm_bind,
+	.unbind = vs_drm_unbind,
+};
+
+static struct platform_driver *drm_sub_drivers[] = {
+};
+
+#define NUM_DRM_DRIVERS \
+	(sizeof(drm_sub_drivers) / sizeof(struct platform_driver *))
+
+static int compare_dev(struct device *dev, void *data)
+{
+	return dev == (struct device *)data;
+}
+
+static struct component_match *vs_drm_match_add(struct device *dev)
+{
+	struct component_match *match = NULL;
+	int i;
+
+	for (i = 0; i < NUM_DRM_DRIVERS; ++i) {
+		struct platform_driver *drv = drm_sub_drivers[i];
+		struct device *p = NULL, *d;
+
+		while ((d = platform_find_device_by_driver(p, &drv->driver))) {
+			put_device(p);
+
+			component_match_add(dev, &match, compare_dev, d);
+			p = d;
+		}
+		put_device(p);
+	}
+
+	return match ?: ERR_PTR(-ENODEV);
+}
+
+static int vs_drm_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct component_match *match;
+
+	match = vs_drm_match_add(dev);
+	if (IS_ERR(match))
+		return PTR_ERR(match);
+
+	return component_master_add_with_match(dev, &vs_drm_ops, match);
+}
+
+static int vs_drm_platform_remove(struct platform_device *pdev)
+{
+	component_master_del(&pdev->dev, &vs_drm_ops);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int vs_drm_suspend(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_suspend(drm);
+}
+
+static int vs_drm_resume(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_resume(drm);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(vs_drm_pm_ops, vs_drm_suspend, vs_drm_resume);
+
+static const struct of_device_id vs_drm_dt_ids[] = {
+	{ .compatible = "verisilicon,display-subsystem", },
+};
+
+MODULE_DEVICE_TABLE(of, vs_drm_dt_ids);
+
+static struct platform_driver vs_drm_platform_driver = {
+	.probe = vs_drm_platform_probe,
+	.remove = vs_drm_platform_remove,
+
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = vs_drm_dt_ids,
+		.pm = &vs_drm_pm_ops,
+	},
+};
+
+static int __init vs_drm_init(void)
+{
+	int ret;
+
+	ret = platform_register_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&vs_drm_platform_driver);
+	if (ret)
+		platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
+
+	return ret;
+}
+
+static void __exit vs_drm_fini(void)
+{
+	platform_driver_unregister(&vs_drm_platform_driver);
+	platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
+}
+
+module_init(vs_drm_init);
+module_exit(vs_drm_fini);
+
+MODULE_DESCRIPTION("VeriSilicon DRM Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
new file mode 100644
index 000000000000..0382b44e3bf0
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_drv.h
@@ -0,0 +1,48 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
+ */
+
+#ifndef __VS_DRV_H__
+#define __VS_DRV_H__
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/version.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_gem.h>
+
+/*
+ *
+ * @dma_dev: device for DMA API.
+ *	- use the first attached device if support iommu
+	else use drm device (only contiguous buffer support)
+ * @domain: iommu domain for DRM.
+ *	- all DC IOMMU share same domain to reduce mapping
+ * @pitch_alignment: buffer pitch alignment required by sub-devices.
+ *
+ */
+struct vs_drm_private {
+	struct device *dma_dev;
+	struct iommu_domain *domain;
+	unsigned int pitch_alignment;
+};
+
+void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
+				   unsigned int alignment);
+
+static inline struct device *to_dma_dev(struct drm_device *dev)
+{
+	struct vs_drm_private *priv = dev->dev_private;
+
+	return priv->dma_dev;
+}
+
+static inline bool is_iommu_enabled(struct drm_device *dev)
+{
+	struct vs_drm_private *priv = dev->dev_private;
+
+	return priv->domain ? true : false;
+}
+
+#endif /* __VS_DRV_H__ */
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index de703c6be969..af4fb50f9207 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -419,6 +419,7 @@  extern "C" {
 #define DRM_FORMAT_MOD_VENDOR_ARM     0x08
 #define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
 #define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a
+#define DRM_FORMAT_MOD_VENDOR_VS      0x0b
 
 /* add more to the end as needed */
 
@@ -1519,6 +1520,88 @@  drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
 #define AMD_FMT_MOD_CLEAR(field) \
 	(~((__u64)AMD_FMT_MOD_##field##_MASK << AMD_FMT_MOD_##field##_SHIFT))
 
+#define DRM_FORMAT_MOD_VS_TYPE_NORMAL        0x00
+#define DRM_FORMAT_MOD_VS_TYPE_COMPRESSED    0x01
+#define DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT  0x02
+#define DRM_FORMAT_MOD_VS_TYPE_MASK     ((__u64)0x3 << 54)
+
+#define fourcc_mod_vs_code(type, val) \
+	fourcc_mod_code(VS, ((((__u64)type) << 54) | (val)))
+
+#define DRM_FORMAT_MOD_VS_DEC_TILE_MODE_MASK    0x3F
+#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_XMAJOR   0x00
+#define DRM_FORMAT_MOD_VS_DEC_TILE_8X8_YMAJOR   0x01
+#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4     0x02
+#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4      0x03
+#define DRM_FORMAT_MOD_VS_DEC_TILE_4X8      0x04
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X4   0x06
+#define DRM_FORMAT_MOD_VS_DEC_TILE_64X4     0x07
+#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4     0x08
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X1  0x09
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X1  0x0A
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X4   0x0B
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_256X2  0x0C
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X2  0x0D
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_128X4  0x0E
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X1   0x0F
+#define DRM_FORMAT_MOD_VS_DEC_TILE_16X8     0x10
+#define DRM_FORMAT_MOD_VS_DEC_TILE_8X16     0x11
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_512X1  0x12
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X4   0x13
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_64X2   0x14
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X2   0x15
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_32X1   0x16
+#define DRM_FORMAT_MOD_VS_DEC_RASTER_16X1   0x17
+#define DRM_FORMAT_MOD_VS_DEC_TILE_128X4    0x18
+#define DRM_FORMAT_MOD_VS_DEC_TILE_256X4    0x19
+#define DRM_FORMAT_MOD_VS_DEC_TILE_512X4    0x1A
+#define DRM_FORMAT_MOD_VS_DEC_TILE_16X16    0x1B
+#define DRM_FORMAT_MOD_VS_DEC_TILE_32X16    0x1C
+#define DRM_FORMAT_MOD_VS_DEC_TILE_64X16    0x1D
+#define DRM_FORMAT_MOD_VS_DEC_TILE_128X8    0x1E
+#define DRM_FORMAT_MOD_VS_DEC_TILE_8X4_S    0x1F
+#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_S   0x20
+#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_S   0x21
+#define DRM_FORMAT_MOD_VS_DEC_TILE_16X4_LSB 0x22
+#define DRM_FORMAT_MOD_VS_DEC_TILE_32X4_LSB 0x23
+#define DRM_FORMAT_MOD_VS_DEC_TILE_32X8     0x24
+
+#define DRM_FORMAT_MOD_VS_DEC_ALIGN_32      (0x01 << 6)
+#define DRM_FORMAT_MOD_VS_DEC_ALIGN_64      (0x01 << 7)
+
+#define fourcc_mod_vs_dec_code(tile, align) \
+	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_COMPRESSED, \
+				((tile) | (align)))
+
+#define DRM_FORMAT_MOD_VS_NORM_MODE_MASK        0x1F
+#define DRM_FORMAT_MOD_VS_LINEAR                0x00
+#define DRM_FORMAT_MOD_VS_TILED4x4              0x01
+#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR    0x02
+#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR    0x03
+#define DRM_FORMAT_MOD_VS_TILE_8X8              0x04
+#define DRM_FORMAT_MOD_VS_TILE_MODE1            0x05
+#define DRM_FORMAT_MOD_VS_TILE_MODE2            0x06
+#define DRM_FORMAT_MOD_VS_TILE_8X4              0x07
+#define DRM_FORMAT_MOD_VS_TILE_MODE4            0x08
+#define DRM_FORMAT_MOD_VS_TILE_MODE5            0x09
+#define DRM_FORMAT_MOD_VS_TILE_MODE6            0x0A
+#define DRM_FORMAT_MOD_VS_SUPER_TILED_XMAJOR_8X4    0x0B
+#define DRM_FORMAT_MOD_VS_SUPER_TILED_YMAJOR_4X8    0x0C
+#define DRM_FORMAT_MOD_VS_TILE_Y                0x0D
+#define DRM_FORMAT_MOD_VS_TILE_128X1            0x0F
+#define DRM_FORMAT_MOD_VS_TILE_256X1            0x10
+#define DRM_FORMAT_MOD_VS_TILE_32X1             0x11
+#define DRM_FORMAT_MOD_VS_TILE_64X1             0x12
+#define DRM_FORMAT_MOD_VS_TILE_MODE4X4          0x15
+
+#define fourcc_mod_vs_norm_code(tile) \
+	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_NORMAL, \
+				(tile))
+
+#define fourcc_mod_vs_custom_code(tile) \
+	fourcc_mod_vs_code(DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT, \
+				(tile))
+
 #if defined(__cplusplus)
 }
 #endif
diff --git a/include/uapi/drm/vs_drm.h b/include/uapi/drm/vs_drm.h
new file mode 100644
index 000000000000..96b7fc95d658
--- /dev/null
+++ b/include/uapi/drm/vs_drm.h
@@ -0,0 +1,50 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
+ */
+
+#ifndef __VS_DRM_H__
+#define __VS_DRM_H__
+
+#include "drm.h"
+
+enum drm_vs_degamma_mode {
+	VS_DEGAMMA_DISABLE = 0,
+	VS_DEGAMMA_BT709 = 1,
+	VS_DEGAMMA_BT2020 = 2,
+};
+
+enum drm_vs_sync_dc_mode {
+	VS_SINGLE_DC = 0,
+	VS_MULTI_DC_PRIMARY = 1,
+	VS_MULTI_DC_SECONDARY = 2,
+};
+
+enum drm_vs_mmu_prefetch_mode {
+	VS_MMU_PREFETCH_DISABLE = 0,
+	VS_MMU_PREFETCH_ENABLE = 1,
+};
+
+struct drm_vs_watermark {
+	__u32 watermark;
+	__u8 qos_low;
+	__u8 qos_high;
+};
+
+struct drm_vs_color_mgmt {
+	__u32 colorkey;
+	__u32 colorkey_high;
+	__u32 clear_value;
+	bool  clear_enable;
+	bool  transparency;
+};
+
+struct drm_vs_roi {
+	bool enable;
+	__u16 roi_x;
+	__u16 roi_y;
+	__u16 roi_w;
+	__u16 roi_h;
+};
+
+#endif /* __VS_DRM_H__ */