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kernel
os
linux
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
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drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
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drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
···
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if (!amdgpu_display_hpd_sense(adev, amdgpu_connector->hpd.hpd)) {
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drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
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} else if (amdgpu_atombios_dp_needs_link_train(amdgpu_connector)) {
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/* Don't try to start link training before we
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* have the dpcd */
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if (!amdgpu_atombios_dp_get_dpcd(amdgpu_connector))
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return;
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+
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/* set it to OFF so that drm_helper_connector_dpms()
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* won't return immediately since the current state
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* is ON at this point.