If the panel is 12bpc then Dithering is not enabled in the Legacy
dithering block , instead its Enabled after the C1 CC1 pipe post
color space conversion.For a 6bpc pannel Dithering is enabled in
Legacy block.
Signed-off-by: Nischal Varide <nischal.varide@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_color.c | 7 +++++++
drivers/gpu/drm/i915/display/intel_display.c | 11 ++++++++++-
drivers/gpu/drm/i915/i915_reg.h | 1 +
3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index dab892d2251b..e11b3dbf0b95 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1574,6 +1574,7 @@ static int glk_color_check(struct intel_crtc_state *crtc_state)
static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
{
u32 gamma_mode = 0;
+ struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
if (crtc_state->hw.degamma_lut)
gamma_mode |= PRE_CSC_GAMMA_ENABLE;
@@ -1588,6 +1589,12 @@ static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
else
gamma_mode |= GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED;
+ if (DISPLAY_VER(i915) >= 13) {
+ if (!crtc_state->dither_force_disable &&
+ (crtc_state->pipe_bpp == 36))
+ gamma_mode |= POST_CC1_GAMMA_ENABLE;
+ }
+
return gamma_mode;
}
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index caf0414e0b50..5345779cfce2 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5762,7 +5762,16 @@ static void bdw_set_pipemisc(const struct intel_crtc_state *crtc_state)
break;
}
- if (crtc_state->dither)
+ /*
+ * If 12bpc panel then, Enables dithering after the CC1 pipe
+ * post color space conversion and not here for display_ver
+ * greater than or equal to thirteen.
+ */
+
+ if (crtc_state->dither && (crtc_state->pipe_bpp != 36))
+ val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
+
+ if (crtc_state->dither && (crtc_state->pipe_bpp == 36) && (DISPLAY_VER(dev_priv) < 13))
val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 24307c49085f..fa800a77ea49 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7743,6 +7743,7 @@ enum {
#define GAMMA_MODE(pipe) _MMIO_PIPE(pipe, _GAMMA_MODE_A, _GAMMA_MODE_B)
#define PRE_CSC_GAMMA_ENABLE (1 << 31)
#define POST_CSC_GAMMA_ENABLE (1 << 30)
+#define POST_CC1_GAMMA_ENABLE (1 << 26)
#define GAMMA_MODE_MODE_MASK (3 << 0)
#define GAMMA_MODE_MODE_8BIT (0 << 0)
#define GAMMA_MODE_MODE_10BIT (1 << 0)
--
2.29.2
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