[PATCH 05/10] drm/amdgpu/gfx6: Clean up rings during reset

Clear the WPTR and RPTR at ring initialization.
Additionally clear the ring contents too.
This is necessary so that the IP block soft reset can
bring the rings back to a clean state.

After a reset, the ring contents could contain packets
emitted before the reset, and thus need to be cleared
to prevent the command processor from executing packets
left over in the ring from before the reset.

Signed-off-by: Timur Kristóf <[email protected]>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
index cd8a34d87c6d..ce63417ae17e 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
@@ -2159,8 +2159,12 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 	WREG32(mmSCRATCH_ADDR, 0);
 
 	/* ring 0 - compute and gfx */
-	/* Set ring buffer size */
 	ring = &adev->gfx.gfx_ring[0];
+	*ring->wptr_cpu_addr = 0;
+	*ring->rptr_cpu_addr = 0;
+	amdgpu_ring_clear_ring(ring);
+
+	/* Set ring buffer size */
 	rb_bufsz = order_base_2(ring->ring_size / 8);
 	tmp = (order_base_2(AMDGPU_GPU_PAGE_SIZE/8) << 8) | rb_bufsz;
 
@@ -2172,7 +2176,8 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 	/* Initialize the ring buffer's read and write pointers */
 	WREG32(mmCP_RB0_CNTL, tmp | CP_RB0_CNTL__RB_RPTR_WR_ENA_MASK);
 	ring->wptr = 0;
-	WREG32(mmCP_RB0_WPTR, ring->wptr);
+	WREG32(mmCP_RB0_WPTR, lower_32_bits(ring->wptr));
+	WREG32(mmCP_RB0_RPTR, lower_32_bits(ring->wptr));
 
 	/* set the wb address whether it's enabled or not */
 	rptr_addr = ring->rptr_gpu_addr;
@@ -2189,6 +2194,9 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 	/* ring 1  - compute only */
 	if (adev->gfx.num_compute_rings >= 1) {
 		ring = &adev->gfx.compute_ring[0];
+		*ring->wptr_cpu_addr = 0;
+		*ring->rptr_cpu_addr = 0;
+		amdgpu_ring_clear_ring(ring);
 
 		rb_bufsz = order_base_2(ring->ring_size / 8);
 		tmp = (order_base_2(AMDGPU_GPU_PAGE_SIZE / 8) << 8) | rb_bufsz;
@@ -2199,7 +2207,8 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 
 		WREG32(mmCP_RB1_CNTL, tmp | CP_RB1_CNTL__RB_RPTR_WR_ENA_MASK);
 		ring->wptr = 0;
-		WREG32(mmCP_RB1_WPTR, ring->wptr);
+		WREG32(mmCP_RB1_WPTR, lower_32_bits(ring->wptr));
+		WREG32(mmCP_RB1_RPTR, lower_32_bits(ring->wptr));
 
 		rptr_addr = ring->rptr_gpu_addr;
 		WREG32(mmCP_RB1_RPTR_ADDR, lower_32_bits(rptr_addr));
@@ -2213,6 +2222,9 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 	/* ring 2 - compute only */
 	if (adev->gfx.num_compute_rings >= 2) {
 		ring = &adev->gfx.compute_ring[1];
+		*ring->wptr_cpu_addr = 0;
+		*ring->rptr_cpu_addr = 0;
+		amdgpu_ring_clear_ring(ring);
 
 		rb_bufsz = order_base_2(ring->ring_size / 8);
 		tmp = (order_base_2(AMDGPU_GPU_PAGE_SIZE / 8) << 8) | rb_bufsz;
@@ -2223,7 +2235,9 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 
 		WREG32(mmCP_RB2_CNTL, tmp | CP_RB2_CNTL__RB_RPTR_WR_ENA_MASK);
 		ring->wptr = 0;
-		WREG32(mmCP_RB2_WPTR, ring->wptr);
+		WREG32(mmCP_RB2_WPTR, lower_32_bits(ring->wptr));
+		WREG32(mmCP_RB2_RPTR, lower_32_bits(ring->wptr));
+
 		rptr_addr = ring->rptr_gpu_addr;
 		WREG32(mmCP_RB2_RPTR_ADDR, lower_32_bits(rptr_addr));
 		WREG32(mmCP_RB2_RPTR_ADDR_HI, upper_32_bits(rptr_addr) & 0xFF);
-- 
2.55.0