[Intel-gfx] [PATCH 2/5] drm/i915/dp: Restrict link retrain workaround to external monitors

[Dhinakaran Pandiyan]

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. Limit 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 at redhat.com>
Cc: Jan-Marek Glogowski <glogow at fbihome.de>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
References: 3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"")
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
---
 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 cac1c7c6cbfd..8bf9afa5683c 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5072,7 +5072,9 @@ intel_dp_long_pulse(struct intel_connector *connector,
 		 */
 		status = connector_status_disconnected;
 		goto out;
-	} else {
+	}
+
+	if (!intel_dp_is_edp(intel_dp)) {
 		/*
 		 * Some monitors do not signal loss of link synchronization
 		 * with an IRQ_HPD, so force a link status check.
-- 
2.14.1