提交 a887adad 编写于 作者: A Alex Deucher

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: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
上级 924f92bf
......@@ -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.
......
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