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| author | Stephen Chandler Paul <cpaul@redhat.com> | 2015-08-21 14:16:12 -0400 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-10-27 22:14:31 -0400 |
| commit | f298cc4107e677f4622a99837044f587e06b1e77 (patch) | |
| tree | 22a9a8735fe6c0f3e7f7e5ffd49751df9e8d3e2e | |
| parent | 7b30a56362585fd98a0fc6fce5573ec45b4e5840 (diff) | |
| download | lwn-f298cc4107e677f4622a99837044f587e06b1e77.tar.gz lwn-f298cc4107e677f4622a99837044f587e06b1e77.zip | |
drm/amdgpu: Don't link train DisplayPort on HPD until we get the dpcd
[ Upstream commit a887adadb7b9ef9eb4ee48e4ad575aefcfd1db14 ]
This is a port of:
DRM - radeon: Don't link train DisplayPort on HPD until we get the dpcd
to amdgpu.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_connectors.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c index 26baa9c05f6c..15f09068ac00 100644 --- a/drivers/gpu/drm/radeon/radeon_connectors.c +++ b/drivers/gpu/drm/radeon/radeon_connectors.c @@ -72,6 +72,11 @@ void radeon_connector_hotplug(struct drm_connector *connector) if (!radeon_hpd_sense(rdev, radeon_connector->hpd.hpd)) { drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF); } else if (radeon_dp_needs_link_train(radeon_connector)) { + /* Don't try to start link training before we + * have the dpcd */ + if (!radeon_dp_getdpcd(radeon_connector)) + return; + /* set it to OFF so that drm_helper_connector_dpms() * won't return immediately since the current state * is ON at this point. |