[PATCH] drm/amdgpu: clear set_q_mode_offs when VM changed

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set_q_mode_offs don't get cleared after GPU reset, nexting SET_Q_MODE
packet to init shadow memory will be skiped, hence there has a page fault.

VM flush is needed after GPU reset, clear set_q_mode_offs when
emitting VM flush.

Fixes: 8dad9c062355 ("drm/amdgpu: workaround to avoid SET_Q_MODE packets v2")
Signed-off-by: ZhenGuo Yin <zhenguo.yin@xxxxxxx>
 drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
index 7a906318e451..c11c6299711e 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
@@ -5465,6 +5465,7 @@ static void gfx_v11_0_ring_emit_vm_flush(struct amdgpu_ring *ring,
 	/* Make sure that we can't skip the SET_Q_MODE packets when the VM
 	 * changed in any way.
+	ring->set_q_mode_offs = 0;
 	ring->set_q_mode_ptr = NULL;

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