Re: [PATCH] drm/i915/skl: handle all pixel formats in skylake_update_primary_plane()

From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Jani Nikula <jani.nikula@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/i915/skl: handle all pixel formats in skylake_update_primary_plane()
Date: Tue, 10 Feb 2015 13:43:39 +0200	[thread overview]
Message-ID: <20150210114339.GQ9152@intel.com> (raw)
In-Reply-To: <1423566949-5319-1-git-send-email-jani.nikula@intel.com>

On Tue, Feb 10, 2015 at 01:15:49PM +0200, Jani Nikula wrote:
> skylake_update_primary_plane() did not handle all pixel formats returned
> by skl_format_to_fourcc(). Handle alpha similar to skl_update_plane().
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89052
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> 
> ---
> 
> This is purely cargo culting to avoid the BUG.
> ---
>  drivers/gpu/drm/i915/intel_display.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 3fe95982be93..cede05256d56 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2751,10 +2751,19 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
>  	case DRM_FORMAT_XRGB8888:
>  		plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
>  		break;
> +	case DRM_FORMAT_ARGB8888:
> +		plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
> +		plane_ctl |= PLANE_CTL_ALPHA_SW_PREMULTIPLY;

We don't do alpha blending yet properly so we should just ignore alpha
for now. And someone should rip out that bit from skl_update_plane() as
well.

Also we seem to be missing more formats here than just these two. hint:
intel_primary_formats_gen4[]

> +		break;
>  	case DRM_FORMAT_XBGR8888:
>  		plane_ctl |= PLANE_CTL_ORDER_RGBX;
>  		plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
>  		break;
> +	case DRM_FORMAT_ABGR8888:
> +		plane_ctl |= PLANE_CTL_ORDER_RGBX;
> +		plane_ctl |= PLANE_CTL_FORMAT_XRGB_8888;
> +		plane_ctl |= PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> +		break;
>  	case DRM_FORMAT_XRGB2101010:
>  		plane_ctl |= PLANE_CTL_FORMAT_XRGB_2101010;
>  		break;
> -- 
> 2.1.4
> 
> _______________________________________________
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> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC
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