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drm/i915/dp: Restrict link retrain workaround to external monitors

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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@redhat.com>
Cc: Jan-Marek Glogowski <glogow@fbihome.de>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
References: 3cf71bc990 ("drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"")
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180927205735.16651-2-dhinakaran.pandiyan@intel.com
(cherry picked from commit f24f6eb958)
Fixes: 399334708b ("drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"")
Cc: stable@vger.kernel.org
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Dhinakaran Pandiyan 2018-09-27 13:57:31 -07:00 committed by Joonas Lahtinen
parent 49af5d95b9
commit f9776280c2
1 changed files with 7 additions and 6 deletions
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13
drivers/gpu/drm/i915/intel_dp.c
View file

@ -5102,12 +5102,13 @@ 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);