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drm/i915/psr: Enable ALPM lock timeout error interruption

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When this error happens sink link is not stable after the required
FW_EXIT_LATENCY period so it will miss the selective update.
As the other PSR errors, for now we are not trying to recover from
it.

Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191128014852.214135-3-jose.souza@intel.com
This commit is contained in:
José Roberto de Souza
2019-11-27 17:48:50 -08:00
parent 95851205f9
commit 700355af64
1 changed files with 36 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/gpu/drm/i915/display/intel_psr.c
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@@ -402,7 +402,9 @@ static void intel_psr_enable_sink(struct intel_dp *intel_dp)
/* Enable ALPM at sink for psr2 */
if (dev_priv->psr.psr2_enabled) {
drm_dp_dpcd_writeb(&intel_dp->aux, DP_RECEIVER_ALPM_CONFIG,
DP_ALPM_ENABLE);
DP_ALPM_ENABLE |
DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE);
dpcd_val |= DP_PSR_ENABLE_PSR2 | DP_PSR_IRQ_HPD_WITH_CRC_ERRORS;
} else {
if (dev_priv->psr.link_standby)
@@ -934,6 +936,9 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
/* Disable PSR on Sink */
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
if (dev_priv->psr.psr2_enabled)
drm_dp_dpcd_writeb(&intel_dp->aux, DP_RECEIVER_ALPM_CONFIG, 0);
dev_priv->psr.enabled = false;
}
@@ -1405,6 +1410,33 @@ static int psr_get_status_and_error_status(struct intel_dp *intel_dp,
return 0;
}
static void psr_alpm_check(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct drm_dp_aux *aux = &intel_dp->aux;
struct i915_psr *psr = &dev_priv->psr;
u8 val;
int r;
if (!psr->psr2_enabled)
return;
r = drm_dp_dpcd_readb(aux, DP_RECEIVER_ALPM_STATUS, &val);
if (r != 1) {
DRM_ERROR("Error reading ALPM status\n");
return;
}
if (val & DP_ALPM_LOCK_TIMEOUT_ERROR) {
intel_psr_disable_locked(intel_dp);
psr->sink_not_reliable = true;
DRM_DEBUG_KMS("ALPM lock timeout error, disabling PSR\n");
/* Clearing error */
drm_dp_dpcd_writeb(aux, DP_RECEIVER_ALPM_STATUS, val);
}
}
void intel_psr_short_pulse(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
@@ -1446,6 +1478,9 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
error_status & ~errors);
/* clear status register */
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, error_status);
psr_alpm_check(intel_dp);
exit:
mutex_unlock(&psr->lock);
}