[Intel-gfx] [PATCH 10/20] drm/i915: Add gamma/degamma readout for bdw+

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Read out the gamme/degamma LUT on bdw+. Not entirely complete
as we need a bit more special sauce to handle the split gamma
mode.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 6842f5c0356d..5742ac1af862 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1991,6 +1991,32 @@ static struct drm_property_blob *bdw_read_lut_10(struct intel_crtc *crtc,
 	return blob;
 }
 
+static void bdw_read_luts(struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_property_blob **blob =
+		crtc_state->csc_mode & CSC_POSITION_BEFORE_GAMMA ?
+		&crtc_state->hw.gamma_lut : &crtc_state->hw.degamma_lut;
+
+	if (!crtc_state->gamma_enable)
+		return;
+
+	switch (crtc_state->gamma_mode) {
+	case GAMMA_MODE_MODE_8BIT:
+		*blob = ilk_read_lut_8(crtc);
+		break;
+	case GAMMA_MODE_MODE_SPLIT:
+		/* FIXME */
+		break;
+	case GAMMA_MODE_MODE_10BIT:
+		*blob = bdw_read_lut_10(crtc, PAL_PREC_INDEX_VALUE(0));
+		break;
+	default:
+		MISSING_CASE(crtc_state->gamma_mode);
+		break;
+	}
+}
+
 static struct drm_property_blob *glk_read_degamma_lut(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -2154,6 +2180,7 @@ void intel_color_init(struct intel_crtc *crtc)
 			dev_priv->display.read_luts = glk_read_luts;
 		} else if (INTEL_GEN(dev_priv) >= 8) {
 			dev_priv->display.load_luts = bdw_load_luts;
+			dev_priv->display.read_luts = bdw_read_luts;
 		} else if (INTEL_GEN(dev_priv) >= 7) {
 			dev_priv->display.load_luts = ivb_load_luts;
 		} else {
-- 
2.26.2