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.nik...@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;
+               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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