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Commit a887adad authored by Alex Deucher's avatar Alex Deucher
Browse files

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: default avatarAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
parent 924f92bf

drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c

+5 −0
Original line number Diff line number Diff line
@@ -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.