drm/i915: Extract check_luts()

In prepartion for per-platform color_check() functions extract the
common code into a separate function.

v2: Improve the C8 comment (Matt)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190327155045.28446-2-ville.syrjala@linux.intel.com

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 467fd1a..5d1bf68 100644 (file)
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -771,6 +771,38 @@ static int check_lut_size(const struct drm_property_blob *lut, int expected)
        return 0;
 }
 
+static int check_luts(const struct intel_crtc_state *crtc_state)
+{
+       struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
+       const struct drm_property_blob *gamma_lut = crtc_state->base.gamma_lut;
+       const struct drm_property_blob *degamma_lut = crtc_state->base.degamma_lut;
+       int gamma_length, degamma_length;
+       u32 gamma_tests, degamma_tests;
+
+       /* Always allow legacy gamma LUT with no further checking. */
+       if (crtc_state_is_legacy_gamma(crtc_state))
+               return 0;
+
+       /* C8 relies on its palette being stored in the legacy LUT */
+       if (crtc_state->c8_planes)
+               return -EINVAL;
+
+       degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size;
+       gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size;
+       degamma_tests = INTEL_INFO(dev_priv)->color.degamma_lut_tests;
+       gamma_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
+
+       if (check_lut_size(degamma_lut, degamma_length) ||
+           check_lut_size(gamma_lut, gamma_length))
+               return -EINVAL;
+
+       if (drm_color_lut_check(degamma_lut, degamma_tests) ||
+           drm_color_lut_check(gamma_lut, gamma_tests))
+               return -EINVAL;
+
+       return 0;
+}
+
 static u32 chv_cgm_mode(const struct intel_crtc_state *crtc_state)
 {
        u32 cgm_mode = 0;
@@ -794,19 +826,11 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
        const struct drm_property_blob *gamma_lut = crtc_state->base.gamma_lut;
        const struct drm_property_blob *degamma_lut = crtc_state->base.degamma_lut;
        bool limited_color_range = false;
-       int gamma_length, degamma_length;
-       u32 gamma_tests, degamma_tests;
        int ret;
 
-       degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size;
-       gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size;
-       degamma_tests = INTEL_INFO(dev_priv)->color.degamma_lut_tests;
-       gamma_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
-
-       /* C8 needs the legacy LUT all to itself */
-       if (crtc_state->c8_planes &&
-           !crtc_state_is_legacy_gamma(crtc_state))
-               return -EINVAL;
+       ret = check_luts(crtc_state);
+       if (ret)
+               return ret;
 
        crtc_state->gamma_enable = (gamma_lut || degamma_lut) &&
                !crtc_state->c8_planes;
@@ -828,25 +852,10 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
        if (IS_CHERRYVIEW(dev_priv))
                crtc_state->cgm_mode = chv_cgm_mode(crtc_state);
 
-       /* Always allow legacy gamma LUT with no further checking. */
        if (!crtc_state->gamma_enable ||
-           crtc_state_is_legacy_gamma(crtc_state)) {
+           crtc_state_is_legacy_gamma(crtc_state))
                crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
-               if (INTEL_GEN(dev_priv) >= 11 &&
-                   crtc_state->gamma_enable)
-                       crtc_state->gamma_mode |= POST_CSC_GAMMA_ENABLE;
-               return 0;
-       }
-
-       if (check_lut_size(degamma_lut, degamma_length) ||
-           check_lut_size(gamma_lut, gamma_length))
-               return -EINVAL;
-
-       if (drm_color_lut_check(degamma_lut, degamma_tests) ||
-           drm_color_lut_check(gamma_lut, gamma_tests))
-               return -EINVAL;
-
-       if (INTEL_GEN(dev_priv) >= 11)
+       else if (INTEL_GEN(dev_priv) >= 11)
                crtc_state->gamma_mode = GAMMA_MODE_MODE_10BIT |
                                         PRE_CSC_GAMMA_ENABLE |
                                         POST_CSC_GAMMA_ENABLE;
@@ -858,6 +867,9 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
                crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
 
        if (INTEL_GEN(dev_priv) >= 11) {
+               if (crtc_state->gamma_enable)
+                       crtc_state->gamma_mode |= POST_CSC_GAMMA_ENABLE;
+
                if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB ||
                    crtc_state->limited_color_range)
                        crtc_state->csc_mode |= ICL_OUTPUT_CSC_ENABLE;