drm/i915: Use drm_color_lut_size()

Avoid all the sizeof(drm_color_lut) business by using
drm_color_lut_size() to convert the blob length into
number of LUT entries.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180223192506.29992-6-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 58d779e..768f1c2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -39,7 +39,7 @@
 #define CTM_COEFF_NEGATIVE(coeff)      (((coeff) & CTM_COEFF_SIGN) != 0)
 #define CTM_COEFF_ABS(coeff)           ((coeff) & (CTM_COEFF_SIGN - 1))
 
-#define LEGACY_LUT_LENGTH              (sizeof(struct drm_color_lut) * 256)
+#define LEGACY_LUT_LENGTH              256
 
 /* Post offset values for RGB->YCBCR conversion */
 #define POSTOFF_RGB_TO_YUV_HI 0x800
@@ -79,7 +79,7 @@ static bool crtc_state_is_legacy_gamma(struct drm_crtc_state *state)
        return !state->degamma_lut &&
                !state->ctm &&
                state->gamma_lut &&
-               state->gamma_lut->length == LEGACY_LUT_LENGTH;
+               drm_color_lut_size(state->gamma_lut) == LEGACY_LUT_LENGTH;
 }
 
 /*
@@ -612,19 +612,17 @@ int intel_color_check(struct drm_crtc *crtc,
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        size_t gamma_length, degamma_length;
 
-       degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size *
-               sizeof(struct drm_color_lut);
-       gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size *
-               sizeof(struct drm_color_lut);
+       degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size;
+       gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size;
 
        /*
         * We allow both degamma & gamma luts at the right size or
         * NULL.
         */
        if ((!crtc_state->degamma_lut ||
-            crtc_state->degamma_lut->length == degamma_length) &&
+            drm_color_lut_size(crtc_state->degamma_lut) == degamma_length) &&
            (!crtc_state->gamma_lut ||
-            crtc_state->gamma_lut->length == gamma_length))
+            drm_color_lut_size(crtc_state->gamma_lut) == gamma_length))
                return 0;
 
        /*