[v5 2/6] drm/i915: Sanitize crtc gamma mode

[Uma Shankar <uma.shankar@intel.com>]

Sanitize crtc gamma mode and update the mode in driver in case
BIOS has setup a different gamma mode as to what is expected by
driver. There is restriction on HSW platform not to read/write
color LUT's if ips is enabled. Handled the same accordingly.

Credits-to: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 696e6f5..03c8f68 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15401,6 +15401,23 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
 		}
 	}
 
+	/*
+	 * Sanitize gamma mode incase BIOS leaves it in SPLIT GAMMA MODE
+	 * Workaround HSW : Do not read or write the pipe palette/gamma data
+	 * while GAMMA_MODE is configured for split gamma and IPS_CTL has IPS
+	 * enabled.
+	 */
+	if (IS_HASWELL(dev_priv)) {
+		if (crtc_state->ips_enabled)
+			hsw_disable_ips(crtc_state);
+
+		intel_color_set_csc(crtc_state);
+		intel_color_load_luts(crtc_state);
+
+		if (crtc_state->ips_enabled)
+			hsw_enable_ips(crtc_state);
+	}
+
 	/* Adjust the state of the output pipe according to whether we
 	 * have active connectors/encoders. */
 	if (crtc_state->base.active && !intel_crtc_has_encoders(crtc))
-- 
1.9.1

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