[PATCH v2 2/6] drm/i915/dp: Restrict link retrain workaround to external monitors

From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Jan-Marek Glogowski <glogow@fbihome.de>,
	Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: [PATCH v2 2/6] drm/i915/dp: Restrict link retrain workaround to external monitors
Date: Mon, 24 Sep 2018 15:45:24 -0700	[thread overview]
Message-ID: <20180924224528.4744-2-dhinakaran.pandiyan@intel.com> (raw)
In-Reply-To: <20180924224528.4744-1-dhinakaran.pandiyan@intel.com>

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: 3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"")
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
---
 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 34c561011e7a..6130d05d8b88 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5072,12 +5072,13 @@ 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);
-- 
2.17.1

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