diff mbox series

[v2,28/43] drm/renesas/rcar-du: Use fbdev-dma

Message ID 20240410130557.31572-29-tzimmermann@suse.de
State New
Headers show
Series drm: Provide fbdev emulation per memory manager | expand

Commit Message

Thomas Zimmermann April 10, 2024, 1:02 p.m. UTC
Implement fbdev emulation with fbdev-dma. Fbdev-dma now supports
damage handling, which is required by rcar-du. Avoids the overhead of
fbdev-generic's additional shadow buffering. No functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Laurent Pinchart April 12, 2024, 6:57 p.m. UTC | #1
Hi Thomas,

Thank you for the patch.

On Wed, Apr 10, 2024 at 03:02:24PM +0200, Thomas Zimmermann wrote:
> Implement fbdev emulation with fbdev-dma. Fbdev-dma now supports
> damage handling, which is required by rcar-du. Avoids the overhead of
> fbdev-generic's additional shadow buffering. No functional changes.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

On a side note, I noticed that drm_fbdev_generic_client_funcs and
drm_fbdev_dma_client_funcs point to functions that are identical. Would
there be a way to avoid the code duplication ?

> ---
>  drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
> index dee530e4c8b27..fb719d9aff10d 100644
> --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
> @@ -20,7 +20,7 @@
>  
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_drv.h>
> -#include <drm/drm_fbdev_generic.h>
> +#include <drm/drm_fbdev_dma.h>
>  #include <drm/drm_gem_dma_helper.h>
>  #include <drm/drm_managed.h>
>  #include <drm/drm_probe_helper.h>
> @@ -716,7 +716,7 @@ static int rcar_du_probe(struct platform_device *pdev)
>  
>  	drm_info(&rcdu->ddev, "Device %s probed\n", dev_name(&pdev->dev));
>  
> -	drm_fbdev_generic_setup(&rcdu->ddev, 32);
> +	drm_fbdev_dma_setup(&rcdu->ddev, 32);
>  
>  	return 0;
>
Laurent Pinchart April 12, 2024, 7:03 p.m. UTC | #2
On Fri, Apr 12, 2024 at 09:57:27PM +0300, Laurent Pinchart wrote:
> Hi Thomas,
> 
> Thank you for the patch.
> 
> On Wed, Apr 10, 2024 at 03:02:24PM +0200, Thomas Zimmermann wrote:
> > Implement fbdev emulation with fbdev-dma. Fbdev-dma now supports
> > damage handling, which is required by rcar-du. Avoids the overhead of
> > fbdev-generic's additional shadow buffering. No functional changes.
> > 
> > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

I meant

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

> On a side note, I noticed that drm_fbdev_generic_client_funcs and
> drm_fbdev_dma_client_funcs point to functions that are identical. Would
> there be a way to avoid the code duplication ?
> 
> > ---
> >  drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
> > index dee530e4c8b27..fb719d9aff10d 100644
> > --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
> > +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
> > @@ -20,7 +20,7 @@
> >  
> >  #include <drm/drm_atomic_helper.h>
> >  #include <drm/drm_drv.h>
> > -#include <drm/drm_fbdev_generic.h>
> > +#include <drm/drm_fbdev_dma.h>
> >  #include <drm/drm_gem_dma_helper.h>
> >  #include <drm/drm_managed.h>
> >  #include <drm/drm_probe_helper.h>
> > @@ -716,7 +716,7 @@ static int rcar_du_probe(struct platform_device *pdev)
> >  
> >  	drm_info(&rcdu->ddev, "Device %s probed\n", dev_name(&pdev->dev));
> >  
> > -	drm_fbdev_generic_setup(&rcdu->ddev, 32);
> > +	drm_fbdev_dma_setup(&rcdu->ddev, 32);
> >  
> >  	return 0;
> >
Thomas Zimmermann April 15, 2024, 6:59 a.m. UTC | #3
Hi

Am 12.04.24 um 20:57 schrieb Laurent Pinchart:
> Hi Thomas,
>
> Thank you for the patch.
>
> On Wed, Apr 10, 2024 at 03:02:24PM +0200, Thomas Zimmermann wrote:
>> Implement fbdev emulation with fbdev-dma. Fbdev-dma now supports
>> damage handling, which is required by rcar-du. Avoids the overhead of
>> fbdev-generic's additional shadow buffering. No functional changes.
>>
>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
>> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>> Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>
> On a side note, I noticed that drm_fbdev_generic_client_funcs and
> drm_fbdev_dma_client_funcs point to functions that are identical. Would
> there be a way to avoid the code duplication ?

I avoided this so far as I don't want to accidentally de-duplicate 
functions that later turn out to not be identical. But it is on the TODO 
list.

Best regards
Thomas

>
>> ---
>>   drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
>> index dee530e4c8b27..fb719d9aff10d 100644
>> --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
>> +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
>> @@ -20,7 +20,7 @@
>>   
>>   #include <drm/drm_atomic_helper.h>
>>   #include <drm/drm_drv.h>
>> -#include <drm/drm_fbdev_generic.h>
>> +#include <drm/drm_fbdev_dma.h>
>>   #include <drm/drm_gem_dma_helper.h>
>>   #include <drm/drm_managed.h>
>>   #include <drm/drm_probe_helper.h>
>> @@ -716,7 +716,7 @@ static int rcar_du_probe(struct platform_device *pdev)
>>   
>>   	drm_info(&rcdu->ddev, "Device %s probed\n", dev_name(&pdev->dev));
>>   
>> -	drm_fbdev_generic_setup(&rcdu->ddev, 32);
>> +	drm_fbdev_dma_setup(&rcdu->ddev, 32);
>>   
>>   	return 0;
>>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
index dee530e4c8b27..fb719d9aff10d 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_drv.c
@@ -20,7 +20,7 @@ 
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_drv.h>
-#include <drm/drm_fbdev_generic.h>
+#include <drm/drm_fbdev_dma.h>
 #include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_probe_helper.h>
@@ -716,7 +716,7 @@  static int rcar_du_probe(struct platform_device *pdev)
 
 	drm_info(&rcdu->ddev, "Device %s probed\n", dev_name(&pdev->dev));
 
-	drm_fbdev_generic_setup(&rcdu->ddev, 32);
+	drm_fbdev_dma_setup(&rcdu->ddev, 32);
 
 	return 0;