[v8 2/5] drm/i915/icl: Add icl pipe degamma and gamma support

[Uma Shankar <uma.shankar@intel.com>]

Add support for icl pipe degamma and gamma.

v2: Removed a POSTING_READ and corrected the Bit
Definition as per Maarten's comments.

v3: Addressed Matt's review comments. Removed rmw patterns
as suggested by Matt.

v4: Fixed Matt's review comments.

v5: Corrected macro alignment as per Jani Nikula's comments.
Addressed Ville and Matt's  review comments.

v6: Merged ICL degamma handling with GLK and dropped ICL
degamma function as per Ville and Matt's comments.

v7: updated gamma_mode state with pre csc gammma and post
gamma enabling in intel_color_check to align with atomic.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h    | 12 +++++++-----
 drivers/gpu/drm/i915/intel_color.c | 32 ++++++++++++++++++++++++++++++--
 2 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 11bf60d..13a207a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7111,11 +7111,13 @@ enum {
 #define _GAMMA_MODE_A		0x4a480
 #define _GAMMA_MODE_B		0x4ac80
 #define GAMMA_MODE(pipe) _MMIO_PIPE(pipe, _GAMMA_MODE_A, _GAMMA_MODE_B)
-#define GAMMA_MODE_MODE_MASK	(3 << 0)
-#define GAMMA_MODE_MODE_8BIT	(0 << 0)
-#define GAMMA_MODE_MODE_10BIT	(1 << 0)
-#define GAMMA_MODE_MODE_12BIT	(2 << 0)
-#define GAMMA_MODE_MODE_SPLIT	(3 << 0)
+#define  PRE_CSC_GAMMA_ENABLE	(1 << 31)
+#define  POST_CSC_GAMMA_ENABLE	(1 << 30)
+#define  GAMMA_MODE_MODE_MASK	(3 << 0)
+#define  GAMMA_MODE_MODE_8BIT	(0 << 0)
+#define  GAMMA_MODE_MODE_10BIT	(1 << 0)
+#define  GAMMA_MODE_MODE_12BIT	(2 << 0)
+#define  GAMMA_MODE_MODE_SPLIT	(3 << 0)
 
 /* DMC/CSR */
 #define CSR_PROGRAM(i)		_MMIO(0x80000 + (i) * 4)
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 4e13286..0fcaae4 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -583,6 +583,28 @@ static void glk_load_luts(const struct intel_crtc_state *crtc_state)
 	}
 }
 
+static void icl_load_luts(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+
+	glk_load_degamma_lut(crtc_state);
+
+	if (crtc_state_is_legacy_gamma(crtc_state)) {
+		i9xx_load_luts(crtc_state);
+	} else {
+		/* ToDo: Add support for multi segment gamma LUT */
+		bdw_load_gamma_lut(crtc_state, 0);
+
+		/*
+		 * Reset the index, otherwise it prevents the legacy
+		 * palette to be written properly.
+		 */
+		I915_WRITE(PREC_PAL_INDEX(pipe), 0);
+	}
+}
+
 static void cherryview_load_luts(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
@@ -772,7 +794,11 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
 	    drm_color_lut_check(gamma_lut, gamma_tests))
 		return -EINVAL;
 
-	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+	if (INTEL_GEN(dev_priv) >= 11)
+		crtc_state->gamma_mode = GAMMA_MODE_MODE_10BIT |
+					 PRE_CSC_GAMMA_ENABLE |
+					 POST_CSC_GAMMA_ENABLE;
+	else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
 		crtc_state->gamma_mode = GAMMA_MODE_MODE_10BIT;
 	else if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
 		crtc_state->gamma_mode = GAMMA_MODE_MODE_SPLIT;
@@ -796,7 +822,9 @@ void intel_color_init(struct intel_crtc *crtc)
 
 		dev_priv->display.color_commit = i9xx_color_commit;
 	} else {
-		if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
+		if (IS_ICELAKE(dev_priv))
+			dev_priv->display.load_luts = icl_load_luts;
+		else if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
 			dev_priv->display.load_luts = glk_load_luts;
 		else if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
 			dev_priv->display.load_luts = broadwell_load_luts;
-- 
1.9.1

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