drm/i915: Clean up chv CGM (de)gamma defines

Add the missing ldw vs. udw information to the CGM (de)gamma
bit definitions to make it a bit easier to see which should
be used where.

Also use the these appropriately in the LUT entry pack/unpack
functions.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221114153732.11773-5-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/intel_color.c

@@ -1078,13 +1078,13 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
 
 static u32 chv_cgm_degamma_ldw(const struct drm_color_lut *color)
 {
-	return drm_color_lut_extract(color->green, 14) << 16 |
-		drm_color_lut_extract(color->blue, 14);
+	return REG_FIELD_PREP(CGM_PIPE_DEGAMMA_GREEN_LDW_MASK, drm_color_lut_extract(color->green, 14)) |
+		REG_FIELD_PREP(CGM_PIPE_DEGAMMA_BLUE_LDW_MASK, drm_color_lut_extract(color->blue, 14));
 }
 
 static u32 chv_cgm_degamma_udw(const struct drm_color_lut *color)
 {
-	return drm_color_lut_extract(color->red, 14);
+	return REG_FIELD_PREP(CGM_PIPE_DEGAMMA_RED_UDW_MASK, drm_color_lut_extract(color->red, 14));
 }
 
 static void chv_load_cgm_degamma(struct intel_crtc *crtc,
@@ -1105,20 +1105,20 @@ static void chv_load_cgm_degamma(struct intel_crtc *crtc,
 
 static u32 chv_cgm_gamma_ldw(const struct drm_color_lut *color)
 {
-	return drm_color_lut_extract(color->green, 10) << 16 |
-		drm_color_lut_extract(color->blue, 10);
+	return REG_FIELD_PREP(CGM_PIPE_GAMMA_GREEN_LDW_MASK, drm_color_lut_extract(color->green, 10)) |
+		REG_FIELD_PREP(CGM_PIPE_GAMMA_BLUE_LDW_MASK, drm_color_lut_extract(color->blue, 10));
 }
 
 static u32 chv_cgm_gamma_udw(const struct drm_color_lut *color)
 {
-	return drm_color_lut_extract(color->red, 10);
+	return REG_FIELD_PREP(CGM_PIPE_GAMMA_RED_UDW_MASK, drm_color_lut_extract(color->red, 10));
 }
 
 static void chv_cgm_gamma_pack(struct drm_color_lut *entry, u32 ldw, u32 udw)
 {
-	entry->green = intel_color_lut_pack(REG_FIELD_GET(CGM_PIPE_GAMMA_GREEN_MASK, ldw), 10);
-	entry->blue = intel_color_lut_pack(REG_FIELD_GET(CGM_PIPE_GAMMA_BLUE_MASK, ldw), 10);
-	entry->red = intel_color_lut_pack(REG_FIELD_GET(CGM_PIPE_GAMMA_RED_MASK, udw), 10);
+	entry->green = intel_color_lut_pack(REG_FIELD_GET(CGM_PIPE_GAMMA_GREEN_LDW_MASK, ldw), 10);
+	entry->blue = intel_color_lut_pack(REG_FIELD_GET(CGM_PIPE_GAMMA_BLUE_LDW_MASK, ldw), 10);
+	entry->red = intel_color_lut_pack(REG_FIELD_GET(CGM_PIPE_GAMMA_RED_UDW_MASK, udw), 10);
 }
 
 static void chv_load_cgm_gamma(struct intel_crtc *crtc,

drivers/gpu/drm/i915/i915_reg.h

@@ -7651,13 +7651,17 @@ enum skl_power_gate {
 #define _CGM_PIPE_A_CSC_COEFF67	(VLV_DISPLAY_BASE + 0x6790C)
 #define _CGM_PIPE_A_CSC_COEFF8	(VLV_DISPLAY_BASE + 0x67910)
 #define _CGM_PIPE_A_DEGAMMA	(VLV_DISPLAY_BASE + 0x66000)
-#define   CGM_PIPE_DEGAMMA_RED_MASK	REG_GENMASK(13, 0)
-#define   CGM_PIPE_DEGAMMA_GREEN_MASK	REG_GENMASK(29, 16)
-#define   CGM_PIPE_DEGAMMA_BLUE_MASK	REG_GENMASK(13, 0)
+/* cgm degamma ldw */
+#define   CGM_PIPE_DEGAMMA_GREEN_LDW_MASK	REG_GENMASK(29, 16)
+#define   CGM_PIPE_DEGAMMA_BLUE_LDW_MASK	REG_GENMASK(13, 0)
+/* cgm degamma udw */
+#define   CGM_PIPE_DEGAMMA_RED_UDW_MASK		REG_GENMASK(13, 0)
 #define _CGM_PIPE_A_GAMMA	(VLV_DISPLAY_BASE + 0x67000)
-#define   CGM_PIPE_GAMMA_RED_MASK	REG_GENMASK(9, 0)
-#define   CGM_PIPE_GAMMA_GREEN_MASK	REG_GENMASK(25, 16)
-#define   CGM_PIPE_GAMMA_BLUE_MASK	REG_GENMASK(9, 0)
+/* cgm gamma ldw */
+#define   CGM_PIPE_GAMMA_GREEN_LDW_MASK		REG_GENMASK(25, 16)
+#define   CGM_PIPE_GAMMA_BLUE_LDW_MASK		REG_GENMASK(9, 0)
+/* cgm gamma udw */
+#define   CGM_PIPE_GAMMA_RED_UDW_MASK		REG_GENMASK(9, 0)
 #define _CGM_PIPE_A_MODE	(VLV_DISPLAY_BASE + 0x67A00)
 #define   CGM_PIPE_MODE_GAMMA	(1 << 2)
 #define   CGM_PIPE_MODE_CSC	(1 << 1)