[v5][PATCH 09/11] drm/i915: Extract ivb_read_luts()

[Swati Sharma <swati2.sharma@intel.com>]

In this patch, gamma and degamma hw blobs are created for IVB.

v4: -No need to initialize *blob [Jani]
    -Removed right shifts [Jani]
    -Dropped dev local var [Jani]
v5: -Returned blob instead of assigning it internally within the
     function [Ville]
    -Renamed ivb_get_color_config() to ivb_read_luts() [Ville]
    -Enabled degamma blob validation [Ville]

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
 drivers/gpu/drm/i915/intel_color.c | 52 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index c5cc1d9..d8b120a 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -1546,6 +1546,53 @@ static void bdw_read_luts(struct intel_crtc_state *crtc_state)
 	}
 }
 
+static struct drm_property_blob *
+ivb_read_lut_10(struct intel_crtc_state *crtc_state,
+	        u32 prec_index)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	int hw_lut_size = ivb_lut_10_size(prec_index);
+	enum pipe pipe = crtc->pipe;
+	struct drm_property_blob *blob;
+	struct drm_color_lut *blob_data;
+	u32 i, val;
+
+	blob = drm_property_create_blob(&dev_priv->drm,
+					sizeof(struct drm_color_lut) * hw_lut_size,
+					NULL);
+	if (IS_ERR(blob))
+		return NULL;
+
+	blob_data = blob->data;
+
+	for (i = 0; i < hw_lut_size; i++) {
+		I915_WRITE(PREC_PAL_INDEX(pipe), prec_index++);
+		val = I915_READ(PREC_PAL_DATA(pipe));
+
+		blob_data[i].red = intel_color_lut_pack(REG_FIELD_GET(PREC_PAL_DATA_RED_MASK, val), 10);
+		blob_data[i].green = intel_color_lut_pack(REG_FIELD_GET(PREC_PAL_DATA_GREEN_MASK, val), 10);
+		blob_data[i].blue = intel_color_lut_pack(REG_FIELD_GET(PREC_PAL_DATA_BLUE_MASK, val), 10);
+	}
+
+	I915_WRITE(PREC_PAL_INDEX(pipe), 0);
+
+	return blob;
+}
+
+static void ivb_read_luts(struct intel_crtc_state *crtc_state)
+{
+	if (crtc_state->gamma_mode == GAMMA_MODE_MODE_8BIT) {
+		crtc_state->base.gamma_lut = i9xx_read_lut_8(crtc_state);
+	} else if (crtc_state->gamma_mode == GAMMA_MODE_MODE_SPLIT) {
+		crtc_state->base.degamma_lut = ivb_read_lut_10(crtc_state, PAL_PREC_SPLIT_MODE | PAL_PREC_INDEX_VALUE(0));
+		crtc_state->base.gamma_lut = ivb_read_lut_10(crtc_state, PAL_PREC_SPLIT_MODE | PAL_PREC_INDEX_VALUE(512));
+	} else {
+		crtc_state->base.degamma_lut = ivb_read_lut_10(crtc_state, PAL_PREC_INDEX_VALUE(0));
+		crtc_state->base.gamma_lut = ivb_read_lut_10(crtc_state, PAL_PREC_INDEX_VALUE(0));
+	}
+}
+
 void intel_color_init(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -1596,9 +1643,10 @@ void intel_color_init(struct intel_crtc *crtc)
 		} 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)
+		} else if (INTEL_GEN(dev_priv) >= 7) {
 			dev_priv->display.load_luts = ivb_load_luts;
+			dev_priv->display.read_luts = ivb_read_luts;
+		}
 		else
 			dev_priv->display.load_luts = ilk_load_luts;
 	}
-- 
1.9.1

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