On Fri, Mar 30, 2018 at 03:23:34PM -0700, José Roberto de Souza wrote:
> eDP spec states that sink device will do a short pulse in HPD
> line when there is a PSR/PSR2 error that needs to be handled by
> source, this is handling the first and most simples error:
> DP_PSR_SINK_INTERNAL_ERROR.
>
> Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 2 ++
> drivers/gpu/drm/i915/intel_drv.h | 1 +
> drivers/gpu/drm/i915/intel_psr.c | 31 +++++++++++++++++++++++++++++++
> 3 files changed, 34 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index c655f6c08a02..fc8b86bc0120 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4518,6 +4518,8 @@ intel_dp_short_pulse(struct intel_dp *intel_dp)
> if (intel_dp_needs_link_retrain(intel_dp))
> return false;
>
> + intel_psr_hpd_short_pulse_handle(intel_dp);
> +
> if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) {
> DRM_DEBUG_KMS("Link Training Compliance Test requested\n");
> /* Send a Hotplug Uevent to userspace to start modeset */
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 177478f0b032..d4c7e1e0fb86 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1897,6 +1897,7 @@ void intel_psr_exit(struct intel_dp *intel_dp, bool
> wait_idle);
> void intel_psr_activate(struct intel_dp *intel_dp, bool schedule);
> void intel_psr_activate_block_get(struct intel_dp *intel_dp);
> void intel_psr_activate_block_put(struct intel_dp *intel_dp);
> +void intel_psr_hpd_short_pulse_handle(struct intel_dp *intel_dp);
>
> /* intel_runtime_pm.c */
> int intel_power_domains_init(struct drm_i915_private *);
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index f88f12246a23..85d201fce287 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -1250,3 +1250,34 @@ void intel_psr_activate_block_put(struct intel_dp
> *intel_dp)
> out:
> mutex_unlock(&dev_priv->psr.lock);
> }
> +
> +void intel_psr_hpd_short_pulse_handle(struct intel_dp *intel_dp)
> +{
> + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> + struct drm_device *dev = intel_dig_port->base.base.dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + struct i915_psr *psr = &dev_priv->psr;
> + uint8_t val;
> +
> + if (!HAS_PSR(dev_priv))
> + return;
> +
> + mutex_lock(&psr->lock);
> + if (psr->enabled != intel_dp)
> + goto out;
> +
> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS, &val) != 1) {
> + DRM_DEBUG_KMS("PSR_STATUS read failed\n");
> + goto dpcd_read_error;
> + }
> +
> + if ((val & DP_PSR_SINK_STATE_MASK) == DP_PSR_SINK_INTERNAL_ERROR)
> + __intel_psr_exit(dev_priv);
shouldn't we add a debug msg here?
> +
> + /* TODO: handle other PSR/PSR2 errors */
> +dpcd_read_error:
> + if (!dev_priv->psr.busy_frontbuffer_bits)
> + __intel_psr_activate(intel_dp);
> +out:
> + mutex_unlock(&psr->lock);
> +}
> --
> 2.16.3
>
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