Re: [Intel-gfx] [PATCH v7 3/7] drm/i915: Move CCS stride alignment W/A inside intel_fb_stride_alignment

[Radhakrishna Sripada <radhakrishna.sripada@intel.com>]

On Mon, Nov 25, 2019 at 04:26:31PM -0800, Radhakrishna Sripada wrote:
> From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> 
> Easier to read if all the alignment changes are in one place and contained
> within a function.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 31 ++++++++++----------
>  1 file changed, 16 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 2a4593afbe86..85f009500344 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -2611,7 +2611,22 @@ intel_fb_stride_alignment(const struct drm_framebuffer *fb, int color_plane)
>  		else
>  			return 64;
>  	} else {
> -		return intel_tile_width_bytes(fb, color_plane);
> +		u32 tile_width = intel_tile_width_bytes(fb, color_plane);
> +
> +		/*
> +		 * Display WA #0531: skl,bxt,kbl,glk
> +		 *
> +		 * Render decompression and plane width > 3840
> +		 * combined with horizontal panning requires the
> +		 * plane stride to be a multiple of 4. We'll just
> +		 * require the entire fb to accommodate that to avoid
> +		 * potential runtime errors at plane configuration time.
> +		 */
> +		if (IS_GEN(dev_priv, 9) && is_ccs_modifier(fb->modifier) &&
> +		    color_plane == 0 && fb->width > 3840)
> +			tile_width *= 4;
> +
> +		return tile_width;
>  	}
>  }
>  
> @@ -16463,20 +16478,6 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
>  		}
>  
>  		stride_alignment = intel_fb_stride_alignment(fb, i);
> -
> -		/*
> -		 * Display WA #0531: skl,bxt,kbl,glk
> -		 *
> -		 * Render decompression and plane width > 3840
> -		 * combined with horizontal panning requires the
> -		 * plane stride to be a multiple of 4. We'll just
> -		 * require the entire fb to accommodate that to avoid
> -		 * potential runtime errors at plane configuration time.
> -		 */
> -		if (IS_GEN(dev_priv, 9) && i == 0 && fb->width > 3840 &&
> -		    is_ccs_modifier(fb->modifier))
> -			stride_alignment *= 4;
> -
>  		if (fb->pitches[i] & (stride_alignment - 1)) {
>  			DRM_DEBUG_KMS("plane %d pitch (%d) must be at least %u byte aligned\n",
>  				      i, fb->pitches[i], stride_alignment);
> -- 
> 2.20.1
> 
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