drm/amdgpu/sriov: Need to clear kiq position

As will clear vf fw during unload driver, to avoid idle fail. Need
to clear KIQ portion also.

Signed-off-by: Emily Deng <[e-mail]>
Ack-by: Monk.liu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

···
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	int r;
+	uint32_t tmp;
 
 	amdgpu_irq_put(adev, &adev->gfx.priv_reg_irq, 0);
 	amdgpu_irq_put(adev, &adev->gfx.priv_inst_irq, 0);
···
 		DRM_ERROR("KCQ disable failed\n");
 	if (amdgpu_sriov_vf(adev)) {
 		gfx_v10_0_cp_gfx_enable(adev, false);
+		/* Program KIQ position of RLC_CP_SCHEDULERS during destroy */
+		tmp = RREG32_SOC15(GC, 0, mmRLC_CP_SCHEDULERS);
+		tmp &= 0xffffff00;
+		WREG32_SOC15(GC, 0, mmRLC_CP_SCHEDULERS, tmp);
+
 		return 0;
 	}
 	gfx_v10_0_cp_enable(adev, false);