Re: [PATCH 03/16] drm/i915/skl+: add NV12 in skl_format_to_fourcc

["Sharma, Shashank" <shashank.sharma@intel.com>]

Regards

Shashank


On 2/6/2018 6:28 PM, Vidya Srinivas wrote:
> From: Mahesh Kumar <mahesh1.kumar@intel.com>
>
> Add support of recognizing DRM_FORMAT_NV12 from plane_format
> register value.
>
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
> ---
>   drivers/gpu/drm/i915/intel_display.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 60ba5bb..e3a6a7f 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2626,6 +2626,8 @@ static int skl_format_to_fourcc(int format, bool rgb_order, bool alpha)
>   	switch (format) {
>   	case PLANE_CTL_FORMAT_RGB_565:
>   		return DRM_FORMAT_RGB565;
> +	case PLANE_CTL_FORMAT_NV12:
> +		return DRM_FORMAT_NV12;
I dont think this is correct, the case PLANE_CTL_FORMAT_NV12 is defined 
as (1 << 24) but when I check bspec definition, 24th bit is set for 
P010/12/16 formats. AFAIK NV12 is 8 bit format whereas P0xx formats are 
10/12/16 bit formats (they both are YCBCR 4:2:0 of course). This means 
we have mixed NV12 format with P0xx formats. When I checked the 
definition of DRM_FORMAT_NV12, I am not sure if that's intended for 
this. Ville, I saw that the DRM_FORMAT_NV12 definition was added by you, 
can you please comment if this is the right usage ?

- Shashank
>   	default:
>   	case PLANE_CTL_FORMAT_XRGB_8888:
>   		if (rgb_order) {

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