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drm/amdgpu/uvd4.2: Don't initialize UVD 4.2 when DPM is disabled

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UVD 4.2 doesn't work at all when DPM is disabled because
the SMU is responsible for ungating it. So, Linux fails
to boot with CIK GPUs when using the amdgpu.dpm=0 parameter.

Fix this by returning -ENOENT from uvd_v4_2_early_init()
when amdgpu_dpm isn't enabled.

Note: amdgpu.dpm=0 is often suggested as a workaround
for issues and is useful for debugging.

Fixes: a2e73f56fa ("drm/amdgpu: Add support for CIK parts")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Timur Kristóf
2026-03-29 18:03:06 +02:00
committed by Alex Deucher
parent 4724bc5b8d
commit 8b3e8fa6d7
1 changed files with 5 additions and 0 deletions
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drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c
+5
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@@ -93,6 +93,11 @@ static void uvd_v4_2_ring_set_wptr(struct amdgpu_ring *ring)
static int uvd_v4_2_early_init(struct amdgpu_ip_block *ip_block)
{
struct amdgpu_device *adev = ip_block->adev;
/* UVD doesn't work without DPM, it needs DPM to ungate it. */
if (!amdgpu_dpm)
return -ENOENT;
adev->uvd.num_uvd_inst = 1;
uvd_v4_2_set_ring_funcs(adev);