[PATCH] drm/i915: Write LUT entries twice in DSB instead of post-write

[Imre Deak]

Rebased patch based on:
https://patchwork.freedesktop.org/patch/519071/?series=113042

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index d23163dc64d4a..3e2177dff020e 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1336,15 +1336,13 @@ static void ilk_load_lut_8(const struct intel_crtc_state *crtc_state,
 	 * unless we either write each entry twice,
 	 * or use non-posted writes
 	 */
-	if (crtc_state->dsb)
-		intel_dsb_nonpost_start(crtc_state->dsb);
+	for (i = 0; i < 256; i++) {
+		if (crtc_state->dsb)
+			ilk_lut_write(crtc_state, LGC_PALETTE(pipe, i), 0);
 
-	for (i = 0; i < 256; i++)
 		ilk_lut_write(crtc_state, LGC_PALETTE(pipe, i),
 			      i9xx_lut_8(&lut[i]));
-
-	if (crtc_state->dsb)
-		intel_dsb_nonpost_end(crtc_state->dsb);
+	}
 }
 
 static void ilk_load_lut_10(const struct intel_crtc_state *crtc_state,
-- 
2.43.3