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drm/amdgpu: Don't link train DisplayPort on HPD until we get the dpcd 

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
This commit is contained in:
Alex Deucher 2015-08-21 18:07:38 -04:00
parent 924f92bf12
commit a887adadb7
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
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@ -75,6 +75,11 @@ void amdgpu_connector_hotplug(struct drm_connector *connector)
if (!amdgpu_display_hpd_sense(adev, amdgpu_connector->hpd.hpd)) {
drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
} else if (amdgpu_atombios_dp_needs_link_train(amdgpu_connector)) {
/* Don't try to start link training before we
* have the dpcd */
if (!amdgpu_atombios_dp_get_dpcd(amdgpu_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.