On Thu, Sep 06, 2018 at 11:21:34PM -0700, Dhinakaran Pandiyan wrote:
> commit '3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check,
> unconditionally during long pulse"")' applies a work around for monitors
> that don't signal link loss. Apply this only for external displays as
> eDP features like PSR when active will have the link turned off and the
> driver ends up retraining the link seeeing that link is not synchronized.
>
> Cc: Lyude Paul <lyude@xxxxxxxxxx>
> Cc: Jan-Marek Glogowski <glogow@xxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> References: 3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"")
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index befdaa076d8c..c59b2f78f41a 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5072,7 +5072,9 @@ intel_dp_full_detect(struct intel_connector *connector,
> */
> status = connector_status_disconnected;
> goto out;
> - } else {
> + }
> +
> + if (!intel_dp_is_edp(intel_dp)) {
Hmm. How do things work if we get a short hpd from the sink while it's
in PSR link off mode? Won't we try to retrain in that case as well?
> /*
> * Check link status in case the link went out of
> * synchronization and the sink did not tell us.
> --
> 2.17.1
--
Ville Syrjälä
Intel
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