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Subject[PATCH 5.7 022/179] drm/amd/display: Check DMCU Exists Before Loading
Date
From: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>

[ Upstream commit 17bdb4a82fe5014c8aa5b2103c80c5729744a096 ]

Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

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 d06fa63801799..7da2a22dbde7e 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1342,9 +1342,14 @@ static int dm_late_init(void *handle)
struct dmcu_iram_parameters params;
unsigned int linear_lut[16];
int i;
- struct dmcu *dmcu = adev->dm.dc->res_pool->dmcu;
+ struct dmcu *dmcu = NULL;
bool ret;

+ if (!adev->dm.fw_dmcu)
+ return detect_mst_link_for_all_connectors(adev->ddev);
+
+ dmcu = adev->dm.dc->res_pool->dmcu;
+
for (i = 0; i < 16; i++)
linear_lut[i] = 0xFFFF * i / 15;

--
2.25.1


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