| Message ID | 1615952569-4711-10-git-send-email-victor.liu@nxp.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add some DRM bridge drivers support for i.MX8qm/qxp SoCs | expand |
Hey Liu, checkpatch --strict had some complaints, with those fixed feel free to add my r-b. Reviewed-by: Robert Foss <robert.foss@linaro.org> On Wed, 17 Mar 2021 at 04:57, Liu Ying <victor.liu@nxp.com> wrote: > > This patch adds a drm bridge driver for i.MX8qxp pixel link to display > pixel interface(PXL2DPI). The PXL2DPI interfaces the pixel link 36-bit > data output and the DSI controller’s MIPI-DPI 24-bit data input, and > inputs of LVDS Display Bridge(LDB) module used in LVDS mode, to remap > the pixel color codings between those modules. The PXL2DPI is purely > combinatorial. > > Signed-off-by: Liu Ying <victor.liu@nxp.com> > --- > v5->v6: > * No change. > > v4->v5: > * No change. > > v3->v4: > * Use 'fsl,sc-resource' DT property to get the SCU resource ID associated with > the PXL2DPI instance instead of using alias ID. (Rob) > > v2->v3: > * Call syscon_node_to_regmap() to get regmap instead of > syscon_regmap_lookup_by_phandle(). > > v1->v2: > * Drop unnecessary port availability check. > > drivers/gpu/drm/bridge/imx/Kconfig | 8 + > drivers/gpu/drm/bridge/imx/Makefile | 1 + > drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 485 +++++++++++++++++++++++++++ > 3 files changed, 494 insertions(+) > create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c > > diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig > index 4d1f027..1ea1ce7 100644 > --- a/drivers/gpu/drm/bridge/imx/Kconfig > +++ b/drivers/gpu/drm/bridge/imx/Kconfig > @@ -14,3 +14,11 @@ config DRM_IMX8QXP_PIXEL_LINK > help > Choose this to enable display pixel link found in > Freescale i.MX8qm/qxp processors. > + > +config DRM_IMX8QXP_PIXEL_LINK_TO_DPI > + tristate "Freescale i.MX8QXP pixel link to display pixel interface" > + depends on OF > + select DRM_KMS_HELPER > + help > + Choose this to enable pixel link to display pixel interface(PXL2DPI) > + found in Freescale i.MX8qxp processor. > diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile > index c15469f..e74dd64 100644 > --- a/drivers/gpu/drm/bridge/imx/Makefile > +++ b/drivers/gpu/drm/bridge/imx/Makefile > @@ -1,2 +1,3 @@ > obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o > obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o > +obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o > diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c > new file mode 100644 > index 00000000..6696855 > --- /dev/null > +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c > @@ -0,0 +1,485 @@ > +// SPDX-License-Identifier: GPL-2.0+ > + > +/* > + * Copyright 2020 NXP > + */ > + > +#include <linux/firmware/imx/svc/misc.h> > +#include <linux/mfd/syscon.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/of_graph.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/regmap.h> > + > +#include <drm/drm_atomic_state_helper.h> > +#include <drm/drm_bridge.h> > +#include <drm/drm_of.h> > +#include <drm/drm_print.h> > + > +#include <dt-bindings/firmware/imx/rsrc.h> > + > +#define PXL2DPI_CTRL 0x40 > +#define CFG1_16BIT 0x0 > +#define CFG2_16BIT 0x1 > +#define CFG3_16BIT 0x2 > +#define CFG1_18BIT 0x3 > +#define CFG2_18BIT 0x4 > +#define CFG_24BIT 0x5 > + > +#define DRIVER_NAME "imx8qxp-pxl2dpi" > + > +struct imx8qxp_pxl2dpi { > + struct regmap *regmap; > + struct drm_bridge bridge; > + struct drm_bridge *next_bridge; > + struct drm_bridge *companion; > + struct device *dev; > + struct imx_sc_ipc *ipc_handle; > + u32 sc_resource; > + u32 in_bus_format; > + u32 out_bus_format; > + u32 pl_sel; > +}; > + > +#define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge) > + > +static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge, > + enum drm_bridge_attach_flags flags) > +{ > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > + > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { > + DRM_DEV_ERROR(p2d->dev, > + "do not support creating a drm_connector\n"); > + return -EINVAL; > + } > + > + if (!bridge->encoder) { > + DRM_DEV_ERROR(p2d->dev, "missing encoder\n"); > + return -ENODEV; > + } > + > + return drm_bridge_attach(bridge->encoder, > + p2d->next_bridge, bridge, > + DRM_BRIDGE_ATTACH_NO_CONNECTOR); > +} > + > +static int > +imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, > + struct drm_crtc_state *crtc_state, > + struct drm_connector_state *conn_state) > +{ > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > + > + p2d->in_bus_format = bridge_state->input_bus_cfg.format; > + p2d->out_bus_format = bridge_state->output_bus_cfg.format; > + > + return 0; > +} > + > +static void > +imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge, > + const struct drm_display_mode *mode, > + const struct drm_display_mode *adjusted_mode) > +{ > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > + struct imx8qxp_pxl2dpi *companion_p2d; > + int ret; > + > + ret = pm_runtime_get_sync(p2d->dev); > + if (ret < 0) > + DRM_DEV_ERROR(p2d->dev, > + "failed to get runtime PM sync: %d\n", ret); > + > + ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource, > + IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel); > + if (ret) > + DRM_DEV_ERROR(p2d->dev, > + "failed to set pixel link selection(%u): %d\n", > + p2d->pl_sel, ret); > + > + switch (p2d->out_bus_format) { > + case MEDIA_BUS_FMT_RGB888_1X24: > + regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT); > + break; > + case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: > + regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT); > + break; > + default: > + DRM_DEV_ERROR(p2d->dev, > + "unsupported output bus format 0x%08x\n", > + p2d->out_bus_format); > + } > + > + if (p2d->companion) { > + companion_p2d = bridge_to_p2d(p2d->companion); > + > + companion_p2d->in_bus_format = p2d->in_bus_format; > + companion_p2d->out_bus_format = p2d->out_bus_format; > + > + p2d->companion->funcs->mode_set(p2d->companion, mode, > + adjusted_mode); > + } > +} > + > +static void > +imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge, > + struct drm_bridge_state *old_bridge_state) > +{ > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > + int ret; > + > + ret = pm_runtime_put(p2d->dev); > + if (ret < 0) > + DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret); > + > + if (p2d->companion) > + p2d->companion->funcs->atomic_disable(p2d->companion, > + old_bridge_state); > +} > + > +static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = { > + MEDIA_BUS_FMT_RGB888_1X24, > + MEDIA_BUS_FMT_RGB666_1X24_CPADHI, > +}; > + > +static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt) > +{ > + int i; > + > + for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) { > + if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt) > + return true; > + } > + > + return false; > +} > + > +static u32 * > +imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, > + struct drm_crtc_state *crtc_state, > + struct drm_connector_state *conn_state, > + u32 output_fmt, > + unsigned int *num_input_fmts) > +{ CHECK: Alignment should match open parenthesis #217: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:164: +imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, > + u32 *input_fmts; > + > + if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt)) > + return NULL; > + > + *num_input_fmts = 1; > + > + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); > + if (!input_fmts) > + return NULL; > + > + switch (output_fmt) { > + case MEDIA_BUS_FMT_RGB888_1X24: > + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO; > + break; > + case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: > + input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO; > + break; > + default: > + kfree(input_fmts); > + input_fmts = NULL; > + break; > + } > + > + return input_fmts; > +} > + > +static u32 * > +imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, > + struct drm_crtc_state *crtc_state, > + struct drm_connector_state *conn_state, > + unsigned int *num_output_fmts) CHECK: Alignment should match open parenthesis #252: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:199: +imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, > +{ > + *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); > + return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts, > + sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL); > +} > + > +static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = { > + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, > + .atomic_reset = drm_atomic_helper_bridge_reset, > + .attach = imx8qxp_pxl2dpi_bridge_attach, > + .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check, > + .mode_set = imx8qxp_pxl2dpi_bridge_mode_set, > + .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable, > + .atomic_get_input_bus_fmts = > + imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts, > + .atomic_get_output_bus_fmts = > + imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts, > +}; > + > +static struct device_node * > +imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d, > + u32 port_id) > +{ > + struct device_node *port, *ep; > + int ep_cnt; > + > + port = of_graph_get_port_by_id(p2d->dev->of_node, port_id); > + if (!port) { > + DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id); > + return ERR_PTR(-ENODEV); > + } > + > + ep_cnt = of_get_available_child_count(port); > + if (ep_cnt == 0) { > + DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", > + port_id); CHECK: Alignment should match open parenthesis #292: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:239: + DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", + port_id); > + ep = ERR_PTR(-ENODEV); > + goto out; > + } else if (ep_cnt > 1) { > + DRM_DEV_ERROR(p2d->dev, > + "invalid available endpoints of port@%u\n", port_id); CHECK: Alignment should match open parenthesis #297: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:244: + DRM_DEV_ERROR(p2d->dev, + "invalid available endpoints of port@%u\n", port_id); > + ep = ERR_PTR(-ENOTSUPP); WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP #298: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:245: + ep = ERR_PTR(-ENOTSUPP); Maybe the more correct return value would be -EINVAL. > + goto out; > + } > + > + ep = of_get_next_available_child(port, NULL); > + if (!ep) { > + DRM_DEV_ERROR(p2d->dev, > + "failed to get available endpoint of port@%u\n", > + port_id); This ^^ indentation also looks funny. > + ep = ERR_PTR(-ENODEV); > + goto out; > + } > +out: > + of_node_put(port); > + return ep; > +} > + > +static struct drm_bridge * > +imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d) > +{ > + struct device_node *ep, *remote; > + struct drm_bridge *next_bridge; > + int ret; > + > + ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1); > + if (IS_ERR(ep)) { > + ret = PTR_ERR(ep); > + return ERR_PTR(ret); > + } > + > + remote = of_graph_get_remote_port_parent(ep); > + if (!remote || !of_device_is_available(remote)) { > + DRM_DEV_ERROR(p2d->dev, "no available remote\n"); > + next_bridge = ERR_PTR(-ENODEV); > + goto out; > + } else if (!of_device_is_available(remote->parent)) { > + DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n"); > + next_bridge = ERR_PTR(-ENODEV); > + goto out; > + } > + > + next_bridge = of_drm_find_bridge(remote); > + if (!next_bridge) { > + next_bridge = ERR_PTR(-EPROBE_DEFER); > + goto out; > + } > +out: > + of_node_put(remote); > + of_node_put(ep); > + > + return next_bridge; > +} > + > +static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d) > +{ > + struct device_node *ep; > + struct of_endpoint endpoint; > + int ret; > + > + ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0); > + if (IS_ERR(ep)) > + return PTR_ERR(ep); > + > + ret = of_graph_parse_endpoint(ep, &endpoint); > + if (ret) { > + DRM_DEV_ERROR(p2d->dev, > + "failed to parse endpoint of port@0: %d\n", ret); > + goto out; > + } > + > + p2d->pl_sel = endpoint.id; > +out: > + of_node_put(ep); > + > + return ret; > +} > + > +static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d) > +{ > + struct imx8qxp_pxl2dpi *companion_p2d; > + struct device *dev = p2d->dev; > + struct device_node *companion; > + struct device_node *port1, *port2; > + const struct of_device_id *match; > + int dual_link; > + int ret = 0; > + > + /* Locate the companion PXL2DPI for dual-link operation, if any. */ > + companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0); > + if (!companion) > + return 0; > + > + if (!of_device_is_available(companion)) { > + DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n"); > + ret = -ENODEV; > + goto out; > + } > + > + /* > + * Sanity check: the companion bridge must have the same compatible > + * string. > + */ > + match = of_match_device(dev->driver->of_match_table, dev); > + if (!of_device_is_compatible(companion, match->compatible)) { > + DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n"); > + ret = -ENXIO; > + goto out; > + } > + > + p2d->companion = of_drm_find_bridge(companion); > + if (!p2d->companion) { > + ret = -EPROBE_DEFER; > + DRM_DEV_DEBUG_DRIVER(p2d->dev, > + "failed to find companion bridge: %d\n", ret); CHECK: Alignment should match open parenthesis #411: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:358: + DRM_DEV_DEBUG_DRIVER(p2d->dev, + "failed to find companion bridge: %d\n", ret); > + goto out; > + } > + > + companion_p2d = bridge_to_p2d(p2d->companion); > + > + /* > + * We need to work out if the sink is expecting us to function in > + * dual-link mode. We do this by looking at the DT port nodes that > + * the next bridges are connected to. If they are marked as expecting > + * even pixels and odd pixels than we need to use the companion PXL2DPI. > + */ > + port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1); > + port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1); > + dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2); > + of_node_put(port1); > + of_node_put(port2); > + > + if (dual_link < 0) { > + ret = dual_link; > + DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", > + ret); CHECK: Alignment should match open parenthesis #432: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:379: + DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", + ret); > + goto out; > + } > + > + DRM_DEV_DEBUG_DRIVER(dev, > + "dual-link configuration detected (companion bridge %pOF)\n", > + companion); CHECK: Alignment should match open parenthesis #437: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:384: + DRM_DEV_DEBUG_DRIVER(dev, + "dual-link configuration detected (companion bridge %pOF)\n", > +out: > + of_node_put(companion); > + return ret; > +} > + > +static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev) > +{ > + struct imx8qxp_pxl2dpi *p2d; > + struct device *dev = &pdev->dev; > + struct device_node *np = dev->of_node; > + int ret; > + > + p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL); > + if (!p2d) > + return -ENOMEM; > + > + p2d->regmap = syscon_node_to_regmap(np->parent); > + if (IS_ERR(p2d->regmap)) { > + ret = PTR_ERR(p2d->regmap); > + if (ret != -EPROBE_DEFER) > + DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); > + return ret; > + } > + > + ret = imx_scu_get_handle(&p2d->ipc_handle); > + if (ret) { > + if (ret != -EPROBE_DEFER) > + DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", > + ret); CHECK: Alignment should match open parenthesis #467: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:414: + DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", + ret); > + return ret; > + } > + > + p2d->dev = dev; > + > + ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource); > + if (ret) { > + DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret); > + return ret; > + } > + > + p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d); > + if (IS_ERR(p2d->next_bridge)) { > + ret = PTR_ERR(p2d->next_bridge); > + if (ret != -EPROBE_DEFER) > + DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", > + ret); CHECK: Alignment should match open parenthesis #484: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:431: + DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", + ret); > + return ret; > + } > + > + ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d); > + if (ret) > + return ret; > + > + ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d); > + if (ret) > + return ret; > + > + platform_set_drvdata(pdev, p2d); > + pm_runtime_enable(dev); > + > + p2d->bridge.driver_private = p2d; > + p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs; > + p2d->bridge.of_node = np; > + > + drm_bridge_add(&p2d->bridge); > + > + return ret; > +} > + > +static int imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev) > +{ > + struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev); > + > + drm_bridge_remove(&p2d->bridge); > + > + pm_runtime_disable(&pdev->dev); > + > + return 0; > +} > + > +static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = { > + { .compatible = "fsl,imx8qxp-pxl2dpi", }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids); > + > +static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = { > + .probe = imx8qxp_pxl2dpi_bridge_probe, > + .remove = imx8qxp_pxl2dpi_bridge_remove, > + .driver = { > + .of_match_table = imx8qxp_pxl2dpi_dt_ids, > + .name = DRIVER_NAME, > + }, > +}; > +module_platform_driver(imx8qxp_pxl2dpi_bridge_driver); > + > +MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver"); > +MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:" DRIVER_NAME); > -- > 2.7.4 >
Hi Robert, On Tue, 2021-03-30 at 11:42 +0200, Robert Foss wrote: > Hey Liu, > > checkpatch --strict had some complaints, with those fixed feel free to > add my r-b. > > Reviewed-by: Robert Foss <robert.foss@linaro.org> Thanks for your review. In the next version, I'll also fix the complaints from 'checkpatch.pl --strict' for the pixel combiner driver(patch 4/16) and pixel link driver(patch 6/16). If no objections, I'll keep your R-b tags on them. > > On Wed, 17 Mar 2021 at 04:57, Liu Ying <victor.liu@nxp.com> wrote: > > This patch adds a drm bridge driver for i.MX8qxp pixel link to display > > pixel interface(PXL2DPI). The PXL2DPI interfaces the pixel link 36-bit > > data output and the DSI controller’s MIPI-DPI 24-bit data input, and > > inputs of LVDS Display Bridge(LDB) module used in LVDS mode, to remap > > the pixel color codings between those modules. The PXL2DPI is purely > > combinatorial. > > > > Signed-off-by: Liu Ying <victor.liu@nxp.com> > > --- > > v5->v6: > > * No change. > > > > v4->v5: > > * No change. > > > > v3->v4: > > * Use 'fsl,sc-resource' DT property to get the SCU resource ID associated with > > the PXL2DPI instance instead of using alias ID. (Rob) > > > > v2->v3: > > * Call syscon_node_to_regmap() to get regmap instead of > > syscon_regmap_lookup_by_phandle(). > > > > v1->v2: > > * Drop unnecessary port availability check. > > > > drivers/gpu/drm/bridge/imx/Kconfig | 8 + > > drivers/gpu/drm/bridge/imx/Makefile | 1 + > > drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 485 +++++++++++++++++++++++++++ > > 3 files changed, 494 insertions(+) > > create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c > > > > diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig > > index 4d1f027..1ea1ce7 100644 > > --- a/drivers/gpu/drm/bridge/imx/Kconfig > > +++ b/drivers/gpu/drm/bridge/imx/Kconfig > > @@ -14,3 +14,11 @@ config DRM_IMX8QXP_PIXEL_LINK > > help > > Choose this to enable display pixel link found in > > Freescale i.MX8qm/qxp processors. > > + > > +config DRM_IMX8QXP_PIXEL_LINK_TO_DPI > > + tristate "Freescale i.MX8QXP pixel link to display pixel interface" > > + depends on OF > > + select DRM_KMS_HELPER > > + help > > + Choose this to enable pixel link to display pixel interface(PXL2DPI) > > + found in Freescale i.MX8qxp processor. > > diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile > > index c15469f..e74dd64 100644 > > --- a/drivers/gpu/drm/bridge/imx/Makefile > > +++ b/drivers/gpu/drm/bridge/imx/Makefile > > @@ -1,2 +1,3 @@ > > obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o > > obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o > > +obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o > > diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c > > new file mode 100644 > > index 00000000..6696855 > > --- /dev/null > > +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c > > @@ -0,0 +1,485 @@ > > +// SPDX-License-Identifier: GPL-2.0+ > > + > > +/* > > + * Copyright 2020 NXP > > + */ > > + > > +#include <linux/firmware/imx/svc/misc.h> > > +#include <linux/mfd/syscon.h> > > +#include <linux/module.h> > > +#include <linux/of.h> > > +#include <linux/of_device.h> > > +#include <linux/of_graph.h> > > +#include <linux/platform_device.h> > > +#include <linux/pm_runtime.h> > > +#include <linux/regmap.h> > > + > > +#include <drm/drm_atomic_state_helper.h> > > +#include <drm/drm_bridge.h> > > +#include <drm/drm_of.h> > > +#include <drm/drm_print.h> > > + > > +#include <dt-bindings/firmware/imx/rsrc.h> > > + > > +#define PXL2DPI_CTRL 0x40 > > +#define CFG1_16BIT 0x0 > > +#define CFG2_16BIT 0x1 > > +#define CFG3_16BIT 0x2 > > +#define CFG1_18BIT 0x3 > > +#define CFG2_18BIT 0x4 > > +#define CFG_24BIT 0x5 > > + > > +#define DRIVER_NAME "imx8qxp-pxl2dpi" > > + > > +struct imx8qxp_pxl2dpi { > > + struct regmap *regmap; > > + struct drm_bridge bridge; > > + struct drm_bridge *next_bridge; > > + struct drm_bridge *companion; > > + struct device *dev; > > + struct imx_sc_ipc *ipc_handle; > > + u32 sc_resource; > > + u32 in_bus_format; > > + u32 out_bus_format; > > + u32 pl_sel; > > +}; > > + > > +#define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge) > > + > > +static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge, > > + enum drm_bridge_attach_flags flags) > > +{ > > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > > + > > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { > > + DRM_DEV_ERROR(p2d->dev, > > + "do not support creating a drm_connector\n"); > > + return -EINVAL; > > + } > > + > > + if (!bridge->encoder) { > > + DRM_DEV_ERROR(p2d->dev, "missing encoder\n"); > > + return -ENODEV; > > + } > > + > > + return drm_bridge_attach(bridge->encoder, > > + p2d->next_bridge, bridge, > > + DRM_BRIDGE_ATTACH_NO_CONNECTOR); > > +} > > + > > +static int > > +imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge, > > + struct drm_bridge_state *bridge_state, > > + struct drm_crtc_state *crtc_state, > > + struct drm_connector_state *conn_state) > > +{ > > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > > + > > + p2d->in_bus_format = bridge_state->input_bus_cfg.format; > > + p2d->out_bus_format = bridge_state->output_bus_cfg.format; > > + > > + return 0; > > +} > > + > > +static void > > +imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge, > > + const struct drm_display_mode *mode, > > + const struct drm_display_mode *adjusted_mode) > > +{ > > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > > + struct imx8qxp_pxl2dpi *companion_p2d; > > + int ret; > > + > > + ret = pm_runtime_get_sync(p2d->dev); > > + if (ret < 0) > > + DRM_DEV_ERROR(p2d->dev, > > + "failed to get runtime PM sync: %d\n", ret); > > + > > + ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource, > > + IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel); > > + if (ret) > > + DRM_DEV_ERROR(p2d->dev, > > + "failed to set pixel link selection(%u): %d\n", > > + p2d->pl_sel, ret); > > + > > + switch (p2d->out_bus_format) { > > + case MEDIA_BUS_FMT_RGB888_1X24: > > + regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT); > > + break; > > + case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: > > + regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT); > > + break; > > + default: > > + DRM_DEV_ERROR(p2d->dev, > > + "unsupported output bus format 0x%08x\n", > > + p2d->out_bus_format); > > + } > > + > > + if (p2d->companion) { > > + companion_p2d = bridge_to_p2d(p2d->companion); > > + > > + companion_p2d->in_bus_format = p2d->in_bus_format; > > + companion_p2d->out_bus_format = p2d->out_bus_format; > > + > > + p2d->companion->funcs->mode_set(p2d->companion, mode, > > + adjusted_mode); > > + } > > +} > > + > > +static void > > +imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge, > > + struct drm_bridge_state *old_bridge_state) > > +{ > > + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; > > + int ret; > > + > > + ret = pm_runtime_put(p2d->dev); > > + if (ret < 0) > > + DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret); > > + > > + if (p2d->companion) > > + p2d->companion->funcs->atomic_disable(p2d->companion, > > + old_bridge_state); > > +} > > + > > +static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = { > > + MEDIA_BUS_FMT_RGB888_1X24, > > + MEDIA_BUS_FMT_RGB666_1X24_CPADHI, > > +}; > > + > > +static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt) > > +{ > > + int i; > > + > > + for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) { > > + if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt) > > + return true; > > + } > > + > > + return false; > > +} > > + > > +static u32 * > > +imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, > > + struct drm_bridge_state *bridge_state, > > + struct drm_crtc_state *crtc_state, > > + struct drm_connector_state *conn_state, > > + u32 output_fmt, > > + unsigned int *num_input_fmts) > > +{ > > CHECK: Alignment should match open parenthesis > #217: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:164: > +imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, A fix for this would require over 80 characters per line. Anyway, to make checkpatch happy, I'll do that in the next version. > > > > + u32 *input_fmts; > > + > > + if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt)) > > + return NULL; > > + > > + *num_input_fmts = 1; > > + > > + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); > > + if (!input_fmts) > > + return NULL; > > + > > + switch (output_fmt) { > > + case MEDIA_BUS_FMT_RGB888_1X24: > > + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO; > > + break; > > + case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: > > + input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO; > > + break; > > + default: > > + kfree(input_fmts); > > + input_fmts = NULL; > > + break; > > + } > > + > > + return input_fmts; > > +} > > + > > +static u32 * > > +imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, > > + struct drm_bridge_state *bridge_state, > > + struct drm_crtc_state *crtc_state, > > + struct drm_connector_state *conn_state, > > + unsigned int *num_output_fmts) > > CHECK: Alignment should match open parenthesis > #252: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:199: > +imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, > + struct drm_bridge_state *bridge_state, Ditto. > > > > +{ > > + *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); > > + return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts, > > + sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL); > > +} > > + > > +static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = { > > + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, > > + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, > > + .atomic_reset = drm_atomic_helper_bridge_reset, > > + .attach = imx8qxp_pxl2dpi_bridge_attach, > > + .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check, > > + .mode_set = imx8qxp_pxl2dpi_bridge_mode_set, > > + .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable, > > + .atomic_get_input_bus_fmts = > > + imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts, > > + .atomic_get_output_bus_fmts = > > + imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts, > > +}; > > + > > +static struct device_node * > > +imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d, > > + u32 port_id) > > +{ > > + struct device_node *port, *ep; > > + int ep_cnt; > > + > > + port = of_graph_get_port_by_id(p2d->dev->of_node, port_id); > > + if (!port) { > > + DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id); > > + return ERR_PTR(-ENODEV); > > + } > > + > > + ep_cnt = of_get_available_child_count(port); > > + if (ep_cnt == 0) { > > + DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", > > + port_id); > > CHECK: Alignment should match open parenthesis > #292: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:239: > + DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", > + port_id); Will fix in the next version. > > > > + ep = ERR_PTR(-ENODEV); > > + goto out; > > + } else if (ep_cnt > 1) { > > + DRM_DEV_ERROR(p2d->dev, > > + "invalid available endpoints of port@%u\n", port_id); > > CHECK: Alignment should match open parenthesis > #297: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:244: > + DRM_DEV_ERROR(p2d->dev, > + "invalid available endpoints of port@%u\n", port_id); Ditto. > > > + ep = ERR_PTR(-ENOTSUPP); > > WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP > #298: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:245: > + ep = ERR_PTR(-ENOTSUPP); > > Maybe the more correct return value would be -EINVAL. Will use -EINVAL in the next version. > > > > + goto out; > > + } > > + > > + ep = of_get_next_available_child(port, NULL); > > + if (!ep) { > > + DRM_DEV_ERROR(p2d->dev, > > + "failed to get available endpoint of port@%u\n", > > + port_id); > > This ^^ indentation also looks funny. Will match the open paranthesis in the next version. > > > + ep = ERR_PTR(-ENODEV); > > + goto out; > > + } > > +out: > > + of_node_put(port); > > + return ep; > > +} > > + > > +static struct drm_bridge * > > +imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d) > > +{ > > + struct device_node *ep, *remote; > > + struct drm_bridge *next_bridge; > > + int ret; > > + > > + ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1); > > + if (IS_ERR(ep)) { > > + ret = PTR_ERR(ep); > > + return ERR_PTR(ret); > > + } > > + > > + remote = of_graph_get_remote_port_parent(ep); > > + if (!remote || !of_device_is_available(remote)) { > > + DRM_DEV_ERROR(p2d->dev, "no available remote\n"); > > + next_bridge = ERR_PTR(-ENODEV); > > + goto out; > > + } else if (!of_device_is_available(remote->parent)) { > > + DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n"); > > + next_bridge = ERR_PTR(-ENODEV); > > + goto out; > > + } > > + > > + next_bridge = of_drm_find_bridge(remote); > > + if (!next_bridge) { > > + next_bridge = ERR_PTR(-EPROBE_DEFER); > > + goto out; > > + } > > +out: > > + of_node_put(remote); > > + of_node_put(ep); > > + > > + return next_bridge; > > +} > > + > > +static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d) > > +{ > > + struct device_node *ep; > > + struct of_endpoint endpoint; > > + int ret; > > + > > + ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0); > > + if (IS_ERR(ep)) > > + return PTR_ERR(ep); > > + > > + ret = of_graph_parse_endpoint(ep, &endpoint); > > + if (ret) { > > + DRM_DEV_ERROR(p2d->dev, > > + "failed to parse endpoint of port@0: %d\n", ret); > > + goto out; > > + } > > + > > + p2d->pl_sel = endpoint.id; > > +out: > > + of_node_put(ep); > > + > > + return ret; > > +} > > + > > +static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d) > > +{ > > + struct imx8qxp_pxl2dpi *companion_p2d; > > + struct device *dev = p2d->dev; > > + struct device_node *companion; > > + struct device_node *port1, *port2; > > + const struct of_device_id *match; > > + int dual_link; > > + int ret = 0; > > + > > + /* Locate the companion PXL2DPI for dual-link operation, if any. */ > > + companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0); > > + if (!companion) > > + return 0; > > + > > + if (!of_device_is_available(companion)) { > > + DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n"); > > + ret = -ENODEV; > > + goto out; > > + } > > + > > + /* > > + * Sanity check: the companion bridge must have the same compatible > > + * string. > > + */ > > + match = of_match_device(dev->driver->of_match_table, dev); > > + if (!of_device_is_compatible(companion, match->compatible)) { > > + DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n"); > > + ret = -ENXIO; > > + goto out; > > + } > > + > > + p2d->companion = of_drm_find_bridge(companion); > > + if (!p2d->companion) { > > + ret = -EPROBE_DEFER; > > + DRM_DEV_DEBUG_DRIVER(p2d->dev, > > + "failed to find companion bridge: %d\n", ret); > > CHECK: Alignment should match open parenthesis > #411: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:358: > + DRM_DEV_DEBUG_DRIVER(p2d->dev, > + "failed to find companion bridge: %d\n", ret); Will fix in the next version. > > > > + goto out; > > + } > > + > > + companion_p2d = bridge_to_p2d(p2d->companion); > > + > > + /* > > + * We need to work out if the sink is expecting us to function in > > + * dual-link mode. We do this by looking at the DT port nodes that > > + * the next bridges are connected to. If they are marked as expecting > > + * even pixels and odd pixels than we need to use the companion PXL2DPI. > > + */ > > + port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1); > > + port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1); > > + dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2); > > + of_node_put(port1); > > + of_node_put(port2); > > + > > + if (dual_link < 0) { > > + ret = dual_link; > > + DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", > > + ret); > > CHECK: Alignment should match open parenthesis > #432: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:379: > + DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", > + ret); Ditto. > > > > + goto out; > > + } > > + > > + DRM_DEV_DEBUG_DRIVER(dev, > > + "dual-link configuration detected (companion bridge %pOF)\n", > > + companion); > > CHECK: Alignment should match open parenthesis > #437: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:384: > + DRM_DEV_DEBUG_DRIVER(dev, > + "dual-link configuration detected (companion bridge %pOF)\n", Ditto. > > > > +out: > > + of_node_put(companion); > > + return ret; > > +} > > + > > +static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev) > > +{ > > + struct imx8qxp_pxl2dpi *p2d; > > + struct device *dev = &pdev->dev; > > + struct device_node *np = dev->of_node; > > + int ret; > > + > > + p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL); > > + if (!p2d) > > + return -ENOMEM; > > + > > + p2d->regmap = syscon_node_to_regmap(np->parent); > > + if (IS_ERR(p2d->regmap)) { > > + ret = PTR_ERR(p2d->regmap); > > + if (ret != -EPROBE_DEFER) > > + DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); > > + return ret; > > + } > > + > > + ret = imx_scu_get_handle(&p2d->ipc_handle); > > + if (ret) { > > + if (ret != -EPROBE_DEFER) > > + DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", > > + ret); > > CHECK: Alignment should match open parenthesis > #467: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:414: > + DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", > + ret); Ditto. > > > > + return ret; > > + } > > + > > + p2d->dev = dev; > > + > > + ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource); > > + if (ret) { > > + DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret); > > + return ret; > > + } > > + > > + p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d); > > + if (IS_ERR(p2d->next_bridge)) { > > + ret = PTR_ERR(p2d->next_bridge); > > + if (ret != -EPROBE_DEFER) > > + DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", > > + ret); > > CHECK: Alignment should match open parenthesis > #484: FILE: drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c:431: > + DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", > + ret); Ditto. Liu Ying > > > > + return ret; > > + } > > + > > + ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d); > > + if (ret) > > + return ret; > > + > > + ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d); > > + if (ret) > > + return ret; > > + > > + platform_set_drvdata(pdev, p2d); > > + pm_runtime_enable(dev); > > + > > + p2d->bridge.driver_private = p2d; > > + p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs; > > + p2d->bridge.of_node = np; > > + > > + drm_bridge_add(&p2d->bridge); > > + > > + return ret; > > +} > > + > > +static int imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev) > > +{ > > + struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev); > > + > > + drm_bridge_remove(&p2d->bridge); > > + > > + pm_runtime_disable(&pdev->dev); > > + > > + return 0; > > +} > > + > > +static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = { > > + { .compatible = "fsl,imx8qxp-pxl2dpi", }, > > + { /* sentinel */ } > > +}; > > +MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids); > > + > > +static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = { > > + .probe = imx8qxp_pxl2dpi_bridge_probe, > > + .remove = imx8qxp_pxl2dpi_bridge_remove, > > + .driver = { > > + .of_match_table = imx8qxp_pxl2dpi_dt_ids, > > + .name = DRIVER_NAME, > > + }, > > +}; > > +module_platform_driver(imx8qxp_pxl2dpi_bridge_driver); > > + > > +MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver"); > > +MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); > > +MODULE_LICENSE("GPL v2"); > > +MODULE_ALIAS("platform:" DRIVER_NAME); > > -- > > 2.7.4 > >
diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig index 4d1f027..1ea1ce7 100644 --- a/drivers/gpu/drm/bridge/imx/Kconfig +++ b/drivers/gpu/drm/bridge/imx/Kconfig @@ -14,3 +14,11 @@ config DRM_IMX8QXP_PIXEL_LINK help Choose this to enable display pixel link found in Freescale i.MX8qm/qxp processors. + +config DRM_IMX8QXP_PIXEL_LINK_TO_DPI + tristate "Freescale i.MX8QXP pixel link to display pixel interface" + depends on OF + select DRM_KMS_HELPER + help + Choose this to enable pixel link to display pixel interface(PXL2DPI) + found in Freescale i.MX8qxp processor. diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile index c15469f..e74dd64 100644 --- a/drivers/gpu/drm/bridge/imx/Makefile +++ b/drivers/gpu/drm/bridge/imx/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o +obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c new file mode 100644 index 00000000..6696855 --- /dev/null +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c @@ -0,0 +1,485 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * Copyright 2020 NXP + */ + +#include <linux/firmware/imx/svc/misc.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +#include <drm/drm_atomic_state_helper.h> +#include <drm/drm_bridge.h> +#include <drm/drm_of.h> +#include <drm/drm_print.h> + +#include <dt-bindings/firmware/imx/rsrc.h> + +#define PXL2DPI_CTRL 0x40 +#define CFG1_16BIT 0x0 +#define CFG2_16BIT 0x1 +#define CFG3_16BIT 0x2 +#define CFG1_18BIT 0x3 +#define CFG2_18BIT 0x4 +#define CFG_24BIT 0x5 + +#define DRIVER_NAME "imx8qxp-pxl2dpi" + +struct imx8qxp_pxl2dpi { + struct regmap *regmap; + struct drm_bridge bridge; + struct drm_bridge *next_bridge; + struct drm_bridge *companion; + struct device *dev; + struct imx_sc_ipc *ipc_handle; + u32 sc_resource; + u32 in_bus_format; + u32 out_bus_format; + u32 pl_sel; +}; + +#define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge) + +static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { + DRM_DEV_ERROR(p2d->dev, + "do not support creating a drm_connector\n"); + return -EINVAL; + } + + if (!bridge->encoder) { + DRM_DEV_ERROR(p2d->dev, "missing encoder\n"); + return -ENODEV; + } + + return drm_bridge_attach(bridge->encoder, + p2d->next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); +} + +static int +imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; + + p2d->in_bus_format = bridge_state->input_bus_cfg.format; + p2d->out_bus_format = bridge_state->output_bus_cfg.format; + + return 0; +} + +static void +imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + const struct drm_display_mode *adjusted_mode) +{ + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; + struct imx8qxp_pxl2dpi *companion_p2d; + int ret; + + ret = pm_runtime_get_sync(p2d->dev); + if (ret < 0) + DRM_DEV_ERROR(p2d->dev, + "failed to get runtime PM sync: %d\n", ret); + + ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource, + IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel); + if (ret) + DRM_DEV_ERROR(p2d->dev, + "failed to set pixel link selection(%u): %d\n", + p2d->pl_sel, ret); + + switch (p2d->out_bus_format) { + case MEDIA_BUS_FMT_RGB888_1X24: + regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT); + break; + case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: + regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT); + break; + default: + DRM_DEV_ERROR(p2d->dev, + "unsupported output bus format 0x%08x\n", + p2d->out_bus_format); + } + + if (p2d->companion) { + companion_p2d = bridge_to_p2d(p2d->companion); + + companion_p2d->in_bus_format = p2d->in_bus_format; + companion_p2d->out_bus_format = p2d->out_bus_format; + + p2d->companion->funcs->mode_set(p2d->companion, mode, + adjusted_mode); + } +} + +static void +imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge, + struct drm_bridge_state *old_bridge_state) +{ + struct imx8qxp_pxl2dpi *p2d = bridge->driver_private; + int ret; + + ret = pm_runtime_put(p2d->dev); + if (ret < 0) + DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret); + + if (p2d->companion) + p2d->companion->funcs->atomic_disable(p2d->companion, + old_bridge_state); +} + +static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = { + MEDIA_BUS_FMT_RGB888_1X24, + MEDIA_BUS_FMT_RGB666_1X24_CPADHI, +}; + +static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) { + if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt) + return true; + } + + return false; +} + +static u32 * +imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + u32 output_fmt, + unsigned int *num_input_fmts) +{ + u32 *input_fmts; + + if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt)) + return NULL; + + *num_input_fmts = 1; + + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); + if (!input_fmts) + return NULL; + + switch (output_fmt) { + case MEDIA_BUS_FMT_RGB888_1X24: + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO; + break; + case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: + input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO; + break; + default: + kfree(input_fmts); + input_fmts = NULL; + break; + } + + return input_fmts; +} + +static u32 * +imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + unsigned int *num_output_fmts) +{ + *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); + return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts, + sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL); +} + +static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = { + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, + .atomic_reset = drm_atomic_helper_bridge_reset, + .attach = imx8qxp_pxl2dpi_bridge_attach, + .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check, + .mode_set = imx8qxp_pxl2dpi_bridge_mode_set, + .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable, + .atomic_get_input_bus_fmts = + imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts, + .atomic_get_output_bus_fmts = + imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts, +}; + +static struct device_node * +imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d, + u32 port_id) +{ + struct device_node *port, *ep; + int ep_cnt; + + port = of_graph_get_port_by_id(p2d->dev->of_node, port_id); + if (!port) { + DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id); + return ERR_PTR(-ENODEV); + } + + ep_cnt = of_get_available_child_count(port); + if (ep_cnt == 0) { + DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n", + port_id); + ep = ERR_PTR(-ENODEV); + goto out; + } else if (ep_cnt > 1) { + DRM_DEV_ERROR(p2d->dev, + "invalid available endpoints of port@%u\n", port_id); + ep = ERR_PTR(-ENOTSUPP); + goto out; + } + + ep = of_get_next_available_child(port, NULL); + if (!ep) { + DRM_DEV_ERROR(p2d->dev, + "failed to get available endpoint of port@%u\n", + port_id); + ep = ERR_PTR(-ENODEV); + goto out; + } +out: + of_node_put(port); + return ep; +} + +static struct drm_bridge * +imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d) +{ + struct device_node *ep, *remote; + struct drm_bridge *next_bridge; + int ret; + + ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1); + if (IS_ERR(ep)) { + ret = PTR_ERR(ep); + return ERR_PTR(ret); + } + + remote = of_graph_get_remote_port_parent(ep); + if (!remote || !of_device_is_available(remote)) { + DRM_DEV_ERROR(p2d->dev, "no available remote\n"); + next_bridge = ERR_PTR(-ENODEV); + goto out; + } else if (!of_device_is_available(remote->parent)) { + DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n"); + next_bridge = ERR_PTR(-ENODEV); + goto out; + } + + next_bridge = of_drm_find_bridge(remote); + if (!next_bridge) { + next_bridge = ERR_PTR(-EPROBE_DEFER); + goto out; + } +out: + of_node_put(remote); + of_node_put(ep); + + return next_bridge; +} + +static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d) +{ + struct device_node *ep; + struct of_endpoint endpoint; + int ret; + + ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0); + if (IS_ERR(ep)) + return PTR_ERR(ep); + + ret = of_graph_parse_endpoint(ep, &endpoint); + if (ret) { + DRM_DEV_ERROR(p2d->dev, + "failed to parse endpoint of port@0: %d\n", ret); + goto out; + } + + p2d->pl_sel = endpoint.id; +out: + of_node_put(ep); + + return ret; +} + +static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d) +{ + struct imx8qxp_pxl2dpi *companion_p2d; + struct device *dev = p2d->dev; + struct device_node *companion; + struct device_node *port1, *port2; + const struct of_device_id *match; + int dual_link; + int ret = 0; + + /* Locate the companion PXL2DPI for dual-link operation, if any. */ + companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0); + if (!companion) + return 0; + + if (!of_device_is_available(companion)) { + DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n"); + ret = -ENODEV; + goto out; + } + + /* + * Sanity check: the companion bridge must have the same compatible + * string. + */ + match = of_match_device(dev->driver->of_match_table, dev); + if (!of_device_is_compatible(companion, match->compatible)) { + DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n"); + ret = -ENXIO; + goto out; + } + + p2d->companion = of_drm_find_bridge(companion); + if (!p2d->companion) { + ret = -EPROBE_DEFER; + DRM_DEV_DEBUG_DRIVER(p2d->dev, + "failed to find companion bridge: %d\n", ret); + goto out; + } + + companion_p2d = bridge_to_p2d(p2d->companion); + + /* + * We need to work out if the sink is expecting us to function in + * dual-link mode. We do this by looking at the DT port nodes that + * the next bridges are connected to. If they are marked as expecting + * even pixels and odd pixels than we need to use the companion PXL2DPI. + */ + port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1); + port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1); + dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2); + of_node_put(port1); + of_node_put(port2); + + if (dual_link < 0) { + ret = dual_link; + DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n", + ret); + goto out; + } + + DRM_DEV_DEBUG_DRIVER(dev, + "dual-link configuration detected (companion bridge %pOF)\n", + companion); +out: + of_node_put(companion); + return ret; +} + +static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev) +{ + struct imx8qxp_pxl2dpi *p2d; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + int ret; + + p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL); + if (!p2d) + return -ENOMEM; + + p2d->regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(p2d->regmap)) { + ret = PTR_ERR(p2d->regmap); + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret); + return ret; + } + + ret = imx_scu_get_handle(&p2d->ipc_handle); + if (ret) { + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n", + ret); + return ret; + } + + p2d->dev = dev; + + ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource); + if (ret) { + DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret); + return ret; + } + + p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d); + if (IS_ERR(p2d->next_bridge)) { + ret = PTR_ERR(p2d->next_bridge); + if (ret != -EPROBE_DEFER) + DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n", + ret); + return ret; + } + + ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d); + if (ret) + return ret; + + ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d); + if (ret) + return ret; + + platform_set_drvdata(pdev, p2d); + pm_runtime_enable(dev); + + p2d->bridge.driver_private = p2d; + p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs; + p2d->bridge.of_node = np; + + drm_bridge_add(&p2d->bridge); + + return ret; +} + +static int imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev) +{ + struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev); + + drm_bridge_remove(&p2d->bridge); + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = { + { .compatible = "fsl,imx8qxp-pxl2dpi", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids); + +static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = { + .probe = imx8qxp_pxl2dpi_bridge_probe, + .remove = imx8qxp_pxl2dpi_bridge_remove, + .driver = { + .of_match_table = imx8qxp_pxl2dpi_dt_ids, + .name = DRIVER_NAME, + }, +}; +module_platform_driver(imx8qxp_pxl2dpi_bridge_driver); + +MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver"); +MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME);
This patch adds a drm bridge driver for i.MX8qxp pixel link to display pixel interface(PXL2DPI). The PXL2DPI interfaces the pixel link 36-bit data output and the DSI controller’s MIPI-DPI 24-bit data input, and inputs of LVDS Display Bridge(LDB) module used in LVDS mode, to remap the pixel color codings between those modules. The PXL2DPI is purely combinatorial. Signed-off-by: Liu Ying <victor.liu@nxp.com> --- v5->v6: * No change. v4->v5: * No change. v3->v4: * Use 'fsl,sc-resource' DT property to get the SCU resource ID associated with the PXL2DPI instance instead of using alias ID. (Rob) v2->v3: * Call syscon_node_to_regmap() to get regmap instead of syscon_regmap_lookup_by_phandle(). v1->v2: * Drop unnecessary port availability check. drivers/gpu/drm/bridge/imx/Kconfig | 8 + drivers/gpu/drm/bridge/imx/Makefile | 1 + drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 485 +++++++++++++++++++++++++++ 3 files changed, 494 insertions(+) create mode 100644 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c