[Intel-gfx] [PATCH 08/20] drm/i915: Add glk+ degamma readout

[Ville Syrjala]

From: Ville Syrjälä <ville.syrj...@linux.intel.com>

Read out the degamma LUT on glk+. No state cheker as of yet since
it requires dealing with he glk csc vs. degamma mess.

Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c 
b/drivers/gpu/drm/i915/display/intel_color.c
index 260bbbd5bbf2..437cc56925ab 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1955,10 +1955,51 @@ static struct drm_property_blob *bdw_read_lut_10(struct 
intel_crtc *crtc,
        return blob;
 }
 
+static struct drm_property_blob *glk_read_degamma_lut(struct intel_crtc *crtc)
+{
+       struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+       int i, lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size;
+       enum pipe pipe = crtc->pipe;
+       struct drm_property_blob *blob;
+       struct drm_color_lut *lut;
+
+       blob = drm_property_create_blob(&dev_priv->drm,
+                                       sizeof(struct drm_color_lut) * lut_size,
+                                       NULL);
+       if (IS_ERR(blob))
+               return NULL;
+
+       lut = blob->data;
+
+       /*
+        * When setting the auto-increment bit, the hardware seems to
+        * ignore the index bits, so we need to reset it to index 0
+        * separately.
+        */
+       intel_de_write(dev_priv, PRE_CSC_GAMC_INDEX(pipe), 0);
+       intel_de_write(dev_priv, PRE_CSC_GAMC_INDEX(pipe),
+                      PRE_CSC_GAMC_AUTO_INCREMENT);
+
+       for (i = 0; i < lut_size; i++) {
+               u32 val = intel_de_read(dev_priv, PRE_CSC_GAMC_DATA(pipe));
+
+               lut[i].red = val;
+               lut[i].green = val;
+               lut[i].blue = val;
+       }
+
+       intel_de_write(dev_priv, PRE_CSC_GAMC_INDEX(pipe), 0);
+
+       return blob;
+}
+
 static void glk_read_luts(struct intel_crtc_state *crtc_state)
 {
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 
+       if (crtc_state->csc_enable)
+               crtc_state->hw.degamma_lut = glk_read_degamma_lut(crtc);
+
        if (!crtc_state->gamma_enable)
                return;
 
@@ -2010,6 +2051,9 @@ static void icl_read_luts(struct intel_crtc_state 
*crtc_state)
 {
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 
+       if (crtc_state->gamma_mode & PRE_CSC_GAMMA_ENABLE)
+               crtc_state->hw.degamma_lut = glk_read_degamma_lut(crtc);
+
        if ((crtc_state->gamma_mode & POST_CSC_GAMMA_ENABLE) == 0)
                return;
 
-- 
2.26.2

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