[Intel-gfx] [PATCH 7/9] drm/i915/xelpd: Enable Pipe Degamma

[Uma Shankar]

Enable Pipe Degamma for XE_LPD. Extend the legacy implementation
to incorparate the extended lut size for XE_LPD.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 18b51b9cc2aa..a8b771f22880 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -829,6 +829,12 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)
 	enum pipe pipe = crtc->pipe;
 	int i, lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size;
 	const struct drm_color_lut *lut = crtc_state->hw.degamma_lut->data;
+	u32 extended_lut_size = 0;
+
+	if (DISPLAY_VER(dev_priv) >= 13)
+		extended_lut_size = 131;
+	else
+		extended_lut_size = 35;
 
 	/*
 	 * When setting the auto-increment bit, the hardware seems to
@@ -841,8 +847,8 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)
 
 	for (i = 0; i < lut_size; i++) {
 		/*
-		 * First 33 entries represent range from 0 to 1.0
-		 * 34th and 35th entry will represent extended range
+		 * First lut_size entries represent range from 0 to 1.0
+		 * 3 additional lut entries will represent extended range
 		 * inputs 3.0 and 7.0 respectively, currently clamped
 		 * at 1.0. Since the precision is 16bit, the user
 		 * value can be directly filled to register.
@@ -858,7 +864,7 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)
 	}
 
 	/* Clamp values > 1.0. */
-	while (i++ < 35)
+	while (i++ < extended_lut_size)
 		intel_de_write(dev_priv, PRE_CSC_GAMC_DATA(pipe), 1 << 16);
 
 	intel_de_write(dev_priv, PRE_CSC_GAMC_INDEX(pipe), 0);
-- 
2.26.2