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

AMD General

Review-by: Jesse Zhang <[email protected]>

> -----Original Message-----
> From: amd-gfx <[email protected]> On Behalf Of Alex
> Deucher
> Sent: Tuesday, August 25, 2026 5:24 AM
> To: Deucher, Alexander <[email protected]>
> Cc: [email protected]
> Subject: Re: [PATCH] drm/amdgpu/gfx8: only apply compute quantums to KCQs
>
> Ping?
>
> 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
> >