drm/amd/display: Fix DPIA outbox timeout after GPU reset

[ Upstream commit 6eff272dbee7ad444c491c9a96d49e78e91e2161 ]

[Why]
The HW interrupt gets disabled after GPU reset so we don't receive
notifications for HPD or AUX from DMUB - leading to timeout and
black screen with (or without) DPIA links connected.

[How]
Re-enable the interrupt after GPU reset like we do for the other
DC interrupts.

Fixes: 81927e2808be ("drm/amd/display: Support for DMUB AUX")

Reviewed-by: Jude Shih <Jude.Shih@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index d159672..56f4569 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2213,6 +2213,8 @@ static int dm_resume(void *handle)
        if (amdgpu_in_reset(adev)) {
                dc_state = dm->cached_dc_state;
 
+               amdgpu_dm_outbox_init(adev);
+
                r = dm_dmub_hw_init(adev);
                if (r)
                        DRM_ERROR("DMUB interface failed to initialize: status=%d\n", r);