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From: Dave Airlie <airlied@gmail.com>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH] drm/radeon: don't probe MST on hw we don't support it on
Date: Thu, 18 Jun 2015 14:29:18 +1000	[thread overview]
Message-ID: <1434601758-31326-1-git-send-email-airlied@gmail.com> (raw)

From: Dave Airlie <airlied@redhat.com>

If you do radeon.mst=1 on a gpu without mst hw, and then
plug some mst hw it will oops instead of falling back.

So check we have DCE5 at least before proceeding.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/radeon/radeon_dp_mst.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index 2b98ed3..257b10be 100644
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -663,12 +663,17 @@ int
 radeon_dp_mst_probe(struct radeon_connector *radeon_connector)
 {
 	struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+	struct drm_device *dev = radeon_connector->base.dev;
+	struct radeon_device *rdev = dev->dev_private;
 	int ret;
 	u8 msg[1];
 
 	if (!radeon_mst)
 		return 0;
 
+	if (!ASIC_IS_DCE5(rdev))
+		return 0;
+
 	if (dig_connector->dpcd[DP_DPCD_REV] < 0x12)
 		return 0;
 
-- 
2.4.2

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             reply	other threads:[~2015-06-18  4:34 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-18  4:29 Dave Airlie [this message]
2015-06-18  7:39 ` [PATCH] drm/radeon: don't probe MST on hw we don't support it on Christian König
2015-06-18  8:31   ` Dave Airlie
2015-06-18 13:12     ` Christian König
2015-06-19  1:58       ` Dave Airlie

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