Re: [Intel-gfx] [PATCH] drm/i915: Add PLANE_CUS_CTL restriction in max_width

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Nov 30, 2021 at 10:42:20PM +0530, Vidya Srinivas wrote:
> PLANE_CUS_CTL has a restriction of 4096 width even though
> PLANE_SIZE and scaler size registers supports max 5120.
> Take care of this restriction in max_width.
> 
> Without this patch, when 5k content is sent on HDR plane
> with NV12 content, FIFO underrun is seen and screen blanks
> out.
> 
> v2: Addressed review comments from Ville. Added separate
> functions for max_width - for HDR and SDR
> 
> Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
> Signed-off-by: Yashashvi Shantam <shantam.yashashvi@intel.com>
> ---
>  .../gpu/drm/i915/display/skl_universal_plane.c  | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> index 28890876bdeb..d320a3ba1ade 100644
> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
> @@ -420,7 +420,17 @@ static int icl_plane_min_width(const struct drm_framebuffer *fb,
>  	}
>  }
>  
> -static int icl_plane_max_width(const struct drm_framebuffer *fb,
> +static int icl_plane_max_width_hdr(const struct drm_framebuffer *fb,

Naming wise I would probably go with icl_hdr_plane_max_width() and 
icl_sdr_plane_max_width().

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +			       int color_plane,
> +			       unsigned int rotation)
> +{
> +	if (intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
> +		return 4096;
> +	else
> +		return 5120;
> +}
> +
> +static int icl_plane_max_width_sdr(const struct drm_framebuffer *fb,
>  			       int color_plane,
>  			       unsigned int rotation)
>  {
> @@ -2108,7 +2118,10 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
>  
>  	if (DISPLAY_VER(dev_priv) >= 11) {
>  		plane->min_width = icl_plane_min_width;
> -		plane->max_width = icl_plane_max_width;
> +		if (icl_is_hdr_plane(dev_priv, plane_id))
> +			plane->max_width = icl_plane_max_width_hdr;
> +		else
> +			plane->max_width = icl_plane_max_width_sdr;
>  		plane->max_height = icl_plane_max_height;
>  		plane->min_cdclk = icl_plane_min_cdclk;
>  	} else if (DISPLAY_VER(dev_priv) >= 10) {
> -- 
> 2.33.0

-- 
Ville Syrjälä
Intel