From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 23 Feb 2018 21:25:06 +0200
Subject: drm/i915: Use drm_color_lut_size()
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Git-commit: 80343b3e477f3b3b5a01be664a526878a18eb57d
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/intel_color.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

--- 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(s
 	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 *c
 	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;
 
 	/*