[Intel-gfx] [PATCH v3 5/7] drm/i915/psr: Handle PSR RFB storage error

[Dhinakaran Pandiyan]

On Thu, 2018-05-17 at 15:21 -0700, José Roberto de Souza wrote:
> Sink will interrupt source when it have any problem saving or reading
> the remote frame buffer.
> 
> v3:
> disabling PSR instead of exiting on error
> 
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>

Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_psr.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index 60797c8f9f0e..f72e3f91809f 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -1046,6 +1046,20 @@ void intel_psr_short_pulse(struct intel_dp
> *intel_dp)
>  		psr_disable(intel_dp);
>  	}
>  
> +	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_ERROR_STATUS,
> &val) != 1) {
> +		DRM_ERROR("PSR_ERROR_STATUS dpcd read failed\n");
> +		goto exit;
> +	}
> +
> +	if (val & DP_PSR_RFB_STORAGE_ERROR) {
> +		DRM_DEBUG_KMS("PSR RFB storage error, exiting
> PSR\n");
> +		psr_disable(intel_dp);
> +	}
> +	if (val & (DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR |
> DP_PSR_LINK_CRC_ERROR))
> +		DRM_ERROR("PSR_ERROR_STATUS not handled %x\n", val);
> +	/* clear status register */
> +	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS,
> val);
> +
>  	/* TODO: handle other PSR/PSR2 errors */
>  exit:
>  	mutex_unlock(&psr->lock);