drm/i915: Precompute gamma_mode

We shouldn't be computing gamma mode during the commit phase.
Move it to the check phase.

v2: Reword comments a bit (Matt)
    Rebase

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190205160848.24662-3-ville.syrjala@linux.intel.com
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 31fa599..057f060 100644 (file)
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -375,8 +375,7 @@ static void haswell_load_luts(struct intel_crtc_state *crtc_state)
                reenable_ips = true;
        }
 
-       crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
-       I915_WRITE(GAMMA_MODE(crtc->pipe), GAMMA_MODE_MODE_8BIT);
+       I915_WRITE(GAMMA_MODE(crtc->pipe), crtc_state->gamma_mode);
 
        i9xx_load_luts(crtc_state);
 
@@ -476,9 +475,7 @@ static void broadwell_load_luts(struct intel_crtc_state *crtc_state)
        bdw_load_gamma_lut(crtc_state,
                           INTEL_INFO(dev_priv)->color.degamma_lut_size);
 
-       crtc_state->gamma_mode = GAMMA_MODE_MODE_SPLIT;
-       I915_WRITE(GAMMA_MODE(pipe), GAMMA_MODE_MODE_SPLIT);
-       POSTING_READ(GAMMA_MODE(pipe));
+       I915_WRITE(GAMMA_MODE(pipe), crtc_state->gamma_mode);
 
        /*
         * Reset the index, otherwise it prevents the legacy palette to be
@@ -532,9 +529,7 @@ static void glk_load_luts(struct intel_crtc_state *crtc_state)
 
        bdw_load_gamma_lut(crtc_state, 0);
 
-       crtc_state->gamma_mode = GAMMA_MODE_MODE_10BIT;
-       I915_WRITE(GAMMA_MODE(pipe), GAMMA_MODE_MODE_10BIT);
-       POSTING_READ(GAMMA_MODE(pipe));
+       I915_WRITE(GAMMA_MODE(pipe), crtc_state->gamma_mode);
 }
 
 /* Loads the palette/gamma unit for the CRTC on CherryView. */
@@ -634,8 +629,10 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
        gamma_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
 
        /* Always allow legacy gamma LUT with no further checking. */
-       if (crtc_state_is_legacy_gamma(crtc_state))
+       if (crtc_state_is_legacy_gamma(crtc_state)) {
+               crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
                return 0;
+       }
 
        if (check_lut_size(crtc_state->base.degamma_lut, degamma_length) ||
            check_lut_size(crtc_state->base.gamma_lut, gamma_length))
@@ -645,6 +642,12 @@ int intel_color_check(struct intel_crtc_state *crtc_state)
            drm_color_lut_check(crtc_state->base.gamma_lut, gamma_tests))
                return -EINVAL;
 
+       if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+               crtc_state->gamma_mode = GAMMA_MODE_MODE_10BIT;
+       else if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
+               crtc_state->gamma_mode = GAMMA_MODE_MODE_SPLIT;
+       else
+               crtc_state->gamma_mode = GAMMA_MODE_MODE_8BIT;
 
        return 0;
 }