From 7346a046c6a9b9f30cb1f7d301449300a9174c71 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Thu, 20 Aug 2026 09:02:01 -0400 Subject: [PATCH] drm/amdgpu/gfx8: only apply compute quantums to KCQs 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") Reviewed-by: Jesse Zhang Reviewed-by: Kent Russell Signed-off-by: Alex Deucher (cherry picked from commit 6aae7bab029cdccae9a7157facfe36bfc35fc940) Cc: stable@vger.kernel.org --- 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 6cf427995078..7f91186ef1d1 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,