Re: [PATCH v4 2/8] drm/vkms: Add support for ARGB8888 formats

[Louis Chauvet]

Le 11/06/2025 à 21:55, Maíra Canal a écrit :
> Hi Louis,
>
> On 5/30/25 11:05, Louis Chauvet wrote:
> > The formats XRGB8888 and ARGB8888 were already supported.
> > Add the support for:
> > - XBGR8888
> > - RGBX8888
> > - BGRX8888
> > - ABGR8888
> > - RGBA8888
> > - BGRA8888
> >
> > Signed-off-by: Louis Chauvet <louis.chauvet@xxxxxxxxxxx>
> > ---
>
> [...]
>
> > +READ_LINE_ARGB8888(RGBX8888_read_line, px, 0xFF, px[3], px[2], px[1])
> > +READ_LINE_ARGB8888(BGRX8888_read_line, px, 0xFF, px[1], px[2], px[3])
>
> How did you test those two formats? I noticed that IGT (kms_plane tests)
> doesn't test them.

Hi Maíra,

Thanks for your review!

I wrote this a long time ago, so I don't remember. I was probably greedy 
and added all the "trivial" formats I was able to do and missed that 
this format was not tested.

For this revision, I just started kms_plane to check if it was happy 
after the rebase, I did not check the formats one by one.

Do you want me to remove those formats? I think it costs nothing to keep 
them, especially with the new READ_LINE_ARGB8888 macro, but I will 
comply if you think we should only merge tested formats.

Thanks,
Louis Chauvet

> Best Regards,
> - Maíra
>
> >    
> >    READ_LINE_ARGB8888(ARGB8888_read_line, px, px[3], px[2], px[1], px[0])
> >    READ_LINE_ARGB8888(ABGR8888_read_line, px, px[3], px[0], px[1], px[2])
> > +READ_LINE_ARGB8888(RGBA8888_read_line, px, px[0], px[3], px[2], px[1])
> > +READ_LINE_ARGB8888(BGRA8888_read_line, px, px[0], px[1], px[2], px[3])
> >    
> >    READ_LINE_le16161616(ARGB16161616_read_line, px, px[3], px[2], px[1], px[0])
> >    READ_LINE_le16161616(XRGB16161616_read_line, px, cpu_to_le16(0xFFFF), px[2], px[1], px[0])
> > @@ -644,10 +649,20 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
> >    	switch (format) {
> >    	case DRM_FORMAT_ARGB8888:
> >    		return &ARGB8888_read_line;
> > -	case DRM_FORMAT_XRGB8888:
> > -		return &XRGB8888_read_line;
> >    	case DRM_FORMAT_ABGR8888:
> >    		return &ABGR8888_read_line;
> > +	case DRM_FORMAT_BGRA8888:
> > +		return &BGRA8888_read_line;
> > +	case DRM_FORMAT_RGBA8888:
> > +		return &RGBA8888_read_line;
> > +	case DRM_FORMAT_XRGB8888:
> > +		return &XRGB8888_read_line;
> > +	case DRM_FORMAT_XBGR8888:
> > +		return &XBGR8888_read_line;
> > +	case DRM_FORMAT_RGBX8888:
> > +		return &RGBX8888_read_line;
> > +	case DRM_FORMAT_BGRX8888:
> > +		return &BGRX8888_read_line;
> >    	case DRM_FORMAT_ARGB16161616:
> >    		return &ARGB16161616_read_line;
> >    	case DRM_FORMAT_XRGB16161616:
> > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> > index e3fdd161d0f0..b7f498944c50 100644
> > --- a/drivers/gpu/drm/vkms/vkms_plane.c
> > +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> > @@ -14,8 +14,13 @@
> >    
> >    static const u32 vkms_formats[] = {
> >    	DRM_FORMAT_ARGB8888,
> > -	DRM_FORMAT_XRGB8888,
> >    	DRM_FORMAT_ABGR8888,
> > +	DRM_FORMAT_BGRA8888,
> > +	DRM_FORMAT_RGBA8888,
> > +	DRM_FORMAT_XRGB8888,
> > +	DRM_FORMAT_XBGR8888,
> > +	DRM_FORMAT_RGBX8888,
> > +	DRM_FORMAT_BGRX8888,
> >    	DRM_FORMAT_XRGB16161616,
> >    	DRM_FORMAT_ARGB16161616,
> >    	DRM_FORMAT_RGB565,

--
Louis Chauvet, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com