56 lines
2.1 KiB
Diff
56 lines
2.1 KiB
Diff
From patchwork Thu Sep 27 20:57:31 2018
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
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Subject: [CI, 2/6] drm/i915/dp: Restrict link retrain workaround to external
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monitors
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From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
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X-Patchwork-Id: 253514
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Message-Id: <20180927205735.16651-2-dhinakaran.pandiyan@intel.com>
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To: intel-gfx@lists.freedesktop.org
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Date: Thu, 27 Sep 2018 13:57:31 -0700
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Commit '3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check,
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unconditionally during long pulse"")' applies a work around for sinks
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that don't signal link loss. The work around does not need to have to be
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that broad as the issue was seen with only one particular monitor; limit
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this only for external displays as eDP features like PSR turn off the link
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and the driver ends up retraining the link seeeing that link is not
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synchronized.
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Cc: Lyude Paul <lyude@redhat.com>
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Cc: Jan-Marek Glogowski <glogow@fbihome.de>
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Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
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Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
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References: 3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"")
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Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
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Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
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---
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drivers/gpu/drm/i915/intel_dp.c | 13 +++++++------
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1 file changed, 7 insertions(+), 6 deletions(-)
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diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
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index 207b3ea2ed1a..4e0870f3a4a5 100644
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--- a/drivers/gpu/drm/i915/intel_dp.c
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+++ b/drivers/gpu/drm/i915/intel_dp.c
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@@ -5072,12 +5072,13 @@ intel_dp_long_pulse(struct intel_connector *connector,
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*/
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status = connector_status_disconnected;
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goto out;
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- } else {
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- /*
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- * Some external monitors do not signal loss of link
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- * synchronization with an IRQ_HPD, so force a link status
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- * check.
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- */
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+ }
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+
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+ /*
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+ * Some external monitors do not signal loss of link synchronization
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+ * with an IRQ_HPD, so force a link status check.
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+ */
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+ if (!intel_dp_is_edp(intel_dp)) {
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struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
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intel_dp_retrain_link(encoder, ctx);
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