linux-kernel - [PATCH 5.1 040/115] drm/i915: Fix per-pixel alpha with CCS

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Message-Id: <20190617210802.066159118@linuxfoundation.org>
Date:   Mon, 17 Jun 2019 23:09:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Heinrich Fink <heinrich.fink@...ri.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH 5.1 040/115] drm/i915: Fix per-pixel alpha with CCS

From: Ville Syrjälä <ville.syrjala@...ux.intel.com>

commit 77ce94dbe586c1a6a26cf021c08109c9ce71b3e0 upstream.

We forgot to set .has_alpha=true for the A+CCS formats when the code
started to consult .has_alpha. This manifests as A+CCS being treated
as X+CCS which means no per-pixel alpha blending. Fix the format
list appropriately.

Cc: stable@...r.kernel.org
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Matt Roper <matthew.d.roper@...el.com>
Cc: Heinrich Fink <heinrich.fink@...ri.com>
Reported-by: Heinrich Fink <heinrich.fink@...ri.com>
Tested-by: Heinrich Fink <heinrich.fink@...ri.com>
Fixes: b20815255693 ("drm/i915: Add plane alpha blending support, v2.")
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603142500.25680-1-ville.syrjala@linux.intel.com
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
(cherry picked from commit 38f300410f3e15b6fec76c8d8baed7111b5ea4e4)
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/intel_display.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2444,10 +2444,14 @@ static unsigned int intel_fb_modifier_to
  * main surface.
  */
 static const struct drm_format_info ccs_formats[] = {
-	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
-	{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
-	{ .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
-	{ .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2, .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
+	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
+	{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
+	{ .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true, },
+	{ .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true, },
 };
 
 static const struct drm_format_info *