linux-kernel - [PATCH 5.15 131/179] drm/amd/display: Fix DPIA outbox timeout after GPU reset

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Message-Id: <20211129181723.266322935@linuxfoundation.org>
Date:   Mon, 29 Nov 2021 19:18:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jude Shih <Jude.Shih@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 131/179] drm/amd/display: Fix DPIA outbox timeout after GPU reset

From: Nicholas Kazlauskas <nicholas.kazlauskas@....com>

[ 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@....com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@....com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

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 d15967239474e..56f4569da2f7d 100644
--- 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);
-- 
2.33.0