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drm/amdgpu/vcn: Document IRQ per-instance irq behavior for VCN 4.0.3

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When examining the VCN function init, it is common to find a loop that
initializes VCN rings, which uses one IRQ per instance. However, VCN
4.0.3 deviates from this pattern, as it includes a distinct field to
differentiate instances, which results in a slightly different ring
init. This commit makes this difference explicit by using a fixed index
when initializing the ring buffer and also adds a comment.

Signed-off-by: Rodrigo Siqueira <siqueira@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira 2025-08-24 18:46:40 -06:00 committed by Alex Deucher
parent 8b38bf3883
commit 3d9752f4f9
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c
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@ -212,7 +212,11 @@ static int vcn_v4_0_3_sw_init(struct amdgpu_ip_block *ip_block)
ring->vm_hub = AMDGPU_MMHUB0(adev->vcn.inst[i].aid_id);
sprintf(ring->name, "vcn_unified_%d", adev->vcn.inst[i].aid_id);
r = amdgpu_ring_init(adev, ring, 512, &adev->vcn.inst->irq, 0,
/* There are no per-instance irq source IDs on 4.0.3, the IH
* packets use a separate field to differentiate instances.
*/
r = amdgpu_ring_init(adev, ring, 512, &adev->vcn.inst[0].irq, 0,
AMDGPU_RING_PRIO_DEFAULT,
&adev->vcn.inst[i].sched_score);
if (r)