Re: [PATCH] drm/amdgpu/gfx8: only apply compute quantums to KCQs

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On Thu, Aug 20, 2026 at 10:10 AM Alex Deucher <[email protected]> wrote:
>
> Don't apply to KIQ.  Seems to cause problems on KIQ
> on some ARM platforms.
>
> Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5658
> Fixes: 91cf34bc5a55 ("drm/amdgpu/gfx8: align mqd settings with KFD")
> Signed-off-by: Alex Deucher <[email protected]>
> ---
>  drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> index f7c2b149acd0a..4241453e0ec8b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> @@ -4546,9 +4546,11 @@ static int gfx_v8_0_mqd_init(struct amdgpu_ring *ring)
>         /* set static priority for a queue/ring */
>         gfx_v8_0_mqd_set_priority(ring, mqd);
>         tmp = RREG32(mmCP_HQD_QUANTUM);
> -       tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_EN, 1);
> -       tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_SCALE, 1);
> -       tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_DURATION, 10);
> +       if (ring != &adev->gfx.kiq[0].ring) {
> +               tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_EN, 1);
> +               tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_SCALE, 1);
> +               tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_DURATION, 10);
> +       }
>         mqd->cp_hqd_quantum = tmp;
>
>         /* map_queues packet doesn't need activate the queue,
> --
> 2.55.0
>