[Intel-gfx] [PATCH 1/2] drm/i915: Force a LUT update in intel_initial_commit()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

If we force a plane update to fix up our half populated plane state
we'll also force on the pipe gamma for the plane (since we always
enable pipe gamma currently). If the BIOS hasn't programmed a sensible
LUT into the hardware this will cause the image to become corrupted.
Typical symptoms are a purple/yellow/etc. flash when the driver loads.

To avoid this let's program something sensible into the LUT when
we do the plane update. In the future I plan to add proper plane
gamma enable readout so this is just a temporary measure.

Cc: Hans de Goede <hdegoede at redhat.com>
Fixes: 516a49cc1946 ("drm/i915: Fix assert_plane() warning on bootup with external display")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 132e978227fb..60c1e54285c1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15011,6 +15011,14 @@ static int intel_initial_commit(struct drm_device *dev)
 			ret = drm_atomic_add_affected_planes(state, crtc);
 			if (ret)
 				goto out;
+
+			/*
+			 * FIXME hack to force a LUT update to avoid the
+			 * plane update forcing the pipe gamma on without
+			 * having a proper LUT loaded. Remove once we
+			 * have readout for pipe gamma enable.
+			 */
+			crtc_state->color_mgmt_changed = true;
 		}
 	}
 
-- 
2.18.1