linux-kernel - [RESEND PATCH v2 2/2] drm/i915/mst: Reset MST after resume when necessary

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Message-Id: <20181024021925.27026-3-juston.li@intel.com>
Date:   Tue, 23 Oct 2018 19:19:25 -0700
From:   Juston Li <juston.li@...el.com>
To:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     lyude@...hat.com, clinton.a.taylor@...el.com,
        nathan.d.ciobanu@...el.com, mario.limonciello@...l.com,
        jared_dominguez@...l.com, linux-kernel@...r.kernel.org,
        Lyude <cpaul@...hat.com>, stable@...r.kernel.org,
        Juston Li <juston.li@...el.com>
Subject: [RESEND PATCH v2 2/2] drm/i915/mst: Reset MST after resume when necessary

From: Lyude <cpaul@...hat.com>

A follow-up to the previous commit, we skip checking the status of the
MST device and completely reprobe it if drm_dp_mst_topology_mgr_resume()
returns -EINVAL.

Cc: stable@...r.kernel.org
Signed-off-by: Lyude <cpaul@...hat.com>
Signed-off-by: Juston Li <juston.li@...el.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8c38efef77a1..cb5ffec73094 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -6793,7 +6793,12 @@ void intel_dp_mst_resume(struct drm_i915_private *dev_priv)
 			continue;
 
 		ret = drm_dp_mst_topology_mgr_resume(&intel_dp->mst_mgr);
-		if (ret)
+		/* A full reset is required */
+		if (ret == -EINVAL) {
+			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, false);
+			intel_dp_configure_mst(intel_dp);
+		} else if (ret != 0) {
 			intel_dp_check_mst_status(intel_dp);
+		}
 	}
 }
-- 
2.17.2