Enable pipe dithering while enabling histogram to overcome some
atrifacts seen on the screen.
Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_histogram.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c
index d015350b57ed5c8e9aaab71311159bf51e15e9c7..7d0c5d07042c5eb0e33c95e7cadac5c0d1fda379 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.c
+++ b/drivers/gpu/drm/i915/display/intel_histogram.c
@@ -22,6 +22,13 @@
#define HISTOGRAM_BIN_READ_RETRY_COUNT 5
#define IET_SAMPLE_FORMAT_1_INT_9_FRACT 0x1000009
+static void intel_histogram_enable_dithering(struct intel_display *display,
+ enum pipe pipe)
+{
+ intel_de_rmw(display, PIPE_MISC(pipe), PIPE_MISC_DITHER_ENABLE,
+ PIPE_MISC_DITHER_ENABLE);
+}
+
static void set_bin_index_0(struct intel_display *display, enum pipe pipe)
{
if (DISPLAY_VER(display) >= 20)
@@ -200,6 +207,10 @@ static int intel_histogram_enable(struct intel_crtc *intel_crtc, u8 mode)
if (histogram->enable)
return 0;
+
+ /* Pipe Dithering should be enabled with histogram */
+ intel_histogram_enable_dithering(display, pipe);
+
/* enable histogram, clear DPST_BIN reg and select TC function */
if (DISPLAY_VER(display) >= 20)
intel_de_rmw(display, DPST_CTL(pipe),
--
2.25.1
