Re: [PATCH v2 3/3] drm/simpledrm: Add XRGB2101010 format

[Thomas Zimmermann]

Hi

Am 07.12.21 um 08:29 schrieb Hector Martin:
> This is the format used by the bootloader framebuffer on Apple ARM64
> platforms.
>
> Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
> ---
>   drivers/gpu/drm/tiny/simpledrm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
> index 2f999915b9aa..edadfd9ee882 100644
> --- a/drivers/gpu/drm/tiny/simpledrm.c
> +++ b/drivers/gpu/drm/tiny/simpledrm.c
> @@ -571,7 +571,7 @@ static const uint32_t simpledrm_default_formats[] = {
>   	//DRM_FORMAT_XRGB1555,
>   	//DRM_FORMAT_ARGB1555,
>   	DRM_FORMAT_RGB888,
> -	//DRM_FORMAT_XRGB2101010,
> +	DRM_FORMAT_XRGB2101010,
>   	//DRM_FORMAT_ARGB2101010,

You should also enable DRM_FORMAT_ARGB2101010 here. You added the 
conversion function, so DRM can deal with it. Having an alpha channel 
isn't typically supported for primary planes, but the format is listed 
in SIMPLEFB_FORMATS. [1]

With this change:

Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

Best regards

[1] 
https://elixir.bootlin.com/linux/latest/source/include/linux/platform_data/simplefb.h#L16

>   };
>   

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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