From: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Commit '3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check,
unconditionally during long pulse"")' applies a work around for sinks
that don't signal link loss. The work around does not need to have to be
that broad as the issue was seen with only one particular monitor; limit
this only for external displays as eDP features like PSR turn off the link
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>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20180927205735.16651-2-dhinakaran.pandiyan@xxxxxxxxx
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 29cf7695e4c0..5314cff72f17 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4842,12 +4842,13 @@ intel_dp_long_pulse(struct intel_connector *connector,
*/
status = connector_status_disconnected;
goto out;
- } else {
- /*
- * Some external monitors do not signal loss of link
- * synchronization with an IRQ_HPD, so force a link status
- * check.
- */
+ }
+
+ /*
+ * Some external monitors do not signal loss of link synchronization
+ * with an IRQ_HPD, so force a link status check.
+ */
+ if (!intel_dp_is_edp(intel_dp)) {
struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
intel_dp_retrain_link(encoder, ctx);
--
2.17.2
_______________________________________________
kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx
