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drm/i915/psr: Check if sink PSR capability changed

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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.

v4:
Cleaning DP_PSR_CAPS_CHANGE

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191128014852.214135-4-jose.souza@intel.com
This commit is contained in:
José Roberto de Souza 2019-11-27 17:48:51 -08:00
parent 700355af64
commit ba0af30d24
1 changed files with 24 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

24
drivers/gpu/drm/i915/display/intel_psr.c
View file

@ -1437,6 +1437,29 @@ static void psr_alpm_check(struct intel_dp *intel_dp)
} }
} }
static void psr_capability_changed_check(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct i915_psr *psr = &dev_priv->psr;
u8 val;
int r;
r = drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_ESI, &val);
if (r != 1) {
DRM_ERROR("Error reading DP_PSR_ESI\n");
return;
}
if (val & DP_PSR_CAPS_CHANGE) {
intel_psr_disable_locked(intel_dp);
psr->sink_not_reliable = true;
DRM_DEBUG_KMS("Sink PSR capability changed, disabling PSR\n");
/* Clearing it */
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ESI, val);
}
}
void intel_psr_short_pulse(struct intel_dp *intel_dp) void intel_psr_short_pulse(struct intel_dp *intel_dp)
{ {
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp); struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
@ -1480,6 +1503,7 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, error_status); drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, error_status);
psr_alpm_check(intel_dp); psr_alpm_check(intel_dp);
psr_capability_changed_check(intel_dp);
exit: exit:
mutex_unlock(&psr->lock); mutex_unlock(&psr->lock);