This is a note to let you know that I've just added the patch titled drm/amdgpu: Don't link train DisplayPort on HPD until we get the dpcd to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-amdgpu-don-t-link-train-displayport-on-hpd-until-we-get-the-dpcd.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a887adadb7b9ef9eb4ee48e4ad575aefcfd1db14 Mon Sep 17 00:00:00 2001 From: Alex Deucher <alexander.deucher@xxxxxxx> Date: Fri, 21 Aug 2015 18:07:38 -0400 Subject: drm/amdgpu: Don't link train DisplayPort on HPD until we get the dpcd From: Alex Deucher <alexander.deucher@xxxxxxx> commit a887adadb7b9ef9eb4ee48e4ad575aefcfd1db14 upstream. 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@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c @@ -75,6 +75,11 @@ void amdgpu_connector_hotplug(struct drm 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. Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are queue-4.2/drm-amdgpu-atom-send-out-the-full-aux-address.patch queue-4.2/drm-radeon-atom-send-out-the-full-aux-address.patch queue-4.2/drm-amdgpu-fix-ih-ring-allocation-for-bus-addresses-v2.patch queue-4.2/drm-radeon-don-t-link-train-displayport-on-hpd-until-we-get-the-dpcd.patch queue-4.2/drm-amdgpu-fix-typo-in-dce11-watermark-setup.patch queue-4.2/drm-radeon-native-send-out-the-full-aux-address.patch queue-4.2/drm-amdgpu-don-t-link-train-displayport-on-hpd-until-we-get-the-dpcd.patch queue-4.2/drm-radeon-fix-hdmi-quantization_range-for-pre-dce5-asics.patch queue-4.2/drm-amdgpu-fix-typo-in-dce10-watermark-setup.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html