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@xxxxxxxxx>
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
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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