[PATCH 1/6] drm/i915/psr: Check if sink PSR capability changed
José Roberto de Souza
jose.souza at intel.com
Sat Nov 2 01:05:48 UTC 2019
eDP specification states that sink can have its PSR capability
changed, I have never found any panel doing that but lets add that
for completeness.
For now it is not reading back the PSR capabilities and if possible
re-enabling PSR, this will be added if a panel is found using this
feature.
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
drivers/gpu/drm/i915/display/intel_psr.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index c1d133362b76..51d8a3231284 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1426,6 +1426,18 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
}
/* clear status register */
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, val);
+
+ if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_ESI, &val) != 1) {
+ DRM_ERROR("DP_PSR_ESI dpcd read failed\n");
+ goto exit;
+ }
+
+ if (val & DP_PSR_CAPS_CHANGE) {
+ DRM_DEBUG_KMS("Sink PSR capability changed, disabling PSR\n");
+ intel_psr_disable_locked(intel_dp);
+ psr->sink_not_reliable = true;
+ }
+
exit:
mutex_unlock(&psr->lock);
}
--
2.23.0
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