drm/i915/icl: Drop redundant gamma mode mask

gamma mode mask was not considering the 30th and 31st bits.
Due to this state readout was masking these bits, causing a
mismatch and false warning, even though the registers were
updated correctly. Dropped the gamma mode mask as it is
redundant and ideally entire register content should be
matching. This resolves the state mismatch warnings.
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1550689519-6977-1-git-send-email-uma.shankar@intel.com
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109624

drivers/gpu/drm/i915/i915_reg.h

@@ -7151,7 +7151,6 @@ enum {
 #define GAMMA_MODE(pipe) _MMIO_PIPE(pipe, _GAMMA_MODE_A, _GAMMA_MODE_B)
 #define  PRE_CSC_GAMMA_ENABLE	(1 << 31)
 #define  POST_CSC_GAMMA_ENABLE	(1 << 30)
-#define  GAMMA_MODE_MODE_MASK	(3 << 0)
 #define  GAMMA_MODE_MODE_8BIT	(0 << 0)
 #define  GAMMA_MODE_MODE_10BIT	(1 << 0)
 #define  GAMMA_MODE_MODE_12BIT	(2 << 0)

drivers/gpu/drm/i915/intel_display.c

@@ -9897,8 +9897,7 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 	intel_get_pipe_src_size(crtc, pipe_config);
 	intel_get_crtc_ycbcr_config(crtc, pipe_config);
 
-	pipe_config->gamma_mode =
-		I915_READ(GAMMA_MODE(crtc->pipe)) & GAMMA_MODE_MODE_MASK;
+	pipe_config->gamma_mode = I915_READ(GAMMA_MODE(crtc->pipe));
 
 	if (INTEL_GEN(dev_priv) >= 9) {
 		u32 tmp = I915_READ(SKL_BOTTOM_COLOR(crtc->pipe));