[v7 14/16] drm/i915: Enable Plane Gamma/Degamma

[Uma Shankar]

Update the plane gamma and degamma feature in the
plane state and eventually program to PLANE_COLOR_CTL.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      | 1 +
 drivers/gpu/drm/i915/intel_color.c   | 6 ++++++
 drivers/gpu/drm/i915/intel_display.c | 6 +++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5f5c18a..40bde4b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6757,6 +6757,7 @@ enum {
 #define   PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709		(2 << 17)
 #define   PLANE_COLOR_CSC_MODE_YUV2020_TO_RGB2020	(3 << 17)
 #define   PLANE_COLOR_CSC_MODE_RGB709_TO_RGB2020	(4 << 17)
+#define   PLANE_COLOR_PLANE_PRECSC_GAMMA_ENABLE	(1 << 14)
 #define   PLANE_COLOR_PLANE_GAMMA_DISABLE	(1 << 13)
 #define   PLANE_COLOR_ALPHA_MASK		(0x3 << 4)
 #define   PLANE_COLOR_ALPHA_DISABLE		(0 << 4)
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 22790b4..aa73f88 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -769,8 +769,14 @@ static void icl_load_plane_gamma_lut(const struct drm_plane_state *state,
 /* Loads the palette/gamma unit for the CRTC on Gen11+. */
 static void icl_load_plane_luts(const struct drm_plane_state *state)
 {
+	struct intel_plane_state *plane_state =
+				to_intel_plane_state(state);
+
 	icl_load_plane_degamma_lut(state, 0);
 	icl_load_plane_gamma_lut(state, 0);
+
+	plane_state->gamma_mode |= PLANE_COLOR_PLANE_PRECSC_GAMMA_ENABLE;
+	plane_state->gamma_mode |= ~PLANE_COLOR_PLANE_GAMMA_DISABLE;
 }
 
 static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fc43c37..6b37052 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3815,7 +3815,11 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
 	struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
 	u32 plane_color_ctl = 0;
 
-	plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
+	if (INTEL_GEN(dev_priv) <= 11)
+		plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
+	else
+		plane_color_ctl |= plane_state->gamma_mode;
+
 	plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
 
 	if (fb->format->is_yuv && !icl_is_hdr_plane(dev_priv, plane->id)) {
-- 
1.9.1