From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Unlike the earlier platforms GLK has dedicated degamma and gamma
LUTs. And quite curiously the degamma LUT is actually controlled
via the PLANE_COLOR_CTL CSC enable bit. Hence we must compute
gamma_enable and csc_enable differently to pre-GLK platforms.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_color.c | 40 ++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index cb40c89da038..90ebcf7bef82 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -883,6 +883,44 @@ static int chv_color_check(struct intel_crtc_state *crtc_state)
return 0;
}
+static u32 glk_gamma_mode(const struct intel_crtc_state *crtc_state)
+{
+ if (!crtc_state->gamma_enable ||
+ crtc_state_is_legacy_gamma(crtc_state))
+ return GAMMA_MODE_MODE_8BIT;
+ else
+ return GAMMA_MODE_MODE_10BIT;
+}
+
+static int glk_color_check(struct intel_crtc_state *crtc_state)
+{
+ int ret;
+
+ ret = check_luts(crtc_state);
+ if (ret)
+ return ret;
+
+ crtc_state->gamma_enable =
+ crtc_state->base.gamma_lut &&
+ !crtc_state->c8_planes;
+
+ /* On GLK+ degamma LUT is controlled by csc_enable */
+ crtc_state->csc_enable =
+ crtc_state->base.degamma_lut ||
+ crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB ||
+ crtc_state->base.ctm || crtc_state->limited_color_range;
+
+ crtc_state->gamma_mode = glk_gamma_mode(crtc_state);
+
+ crtc_state->csc_mode = 0;
+
+ ret = intel_color_add_affected_planes(crtc_state);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
{
u32 gamma_mode = 0;
@@ -993,6 +1031,8 @@ void intel_color_init(struct intel_crtc *crtc)
} else {
if (INTEL_GEN(dev_priv) >= 11)
dev_priv->display.color_check = icl_color_check;
+ else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+ dev_priv->display.color_check = glk_color_check;
else
dev_priv->display.color_check = _intel_color_check;
--
2.19.2
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