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 | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c
index d503d0f0a5ee..545376ae365b 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.c
+++ b/drivers/gpu/drm/i915/display/intel_histogram.c
@@ -29,6 +29,13 @@ struct intel_histogram {
u32 bin_data[HISTOGRAM_BIN_COUNT];
};
+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)
@@ -207,6 +214,9 @@ static int intel_histogram_enable(struct intel_crtc *intel_crtc)
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
