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Commit 575a07d2 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/amdgpu/sdma4: set wptr shadow atomically (v2) 



No functional change until wptr polling uses this
location (future patch).

v2: use WRITE_ONCE

Cc: Frank Min <Frank.Min@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 5c33f214

drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

+3 −2
Original line number Diff line number Diff line
@@ -293,6 +293,8 @@ static void sdma_v4_0_ring_set_wptr(struct amdgpu_ring *ring) 


	DRM_DEBUG("Setting write pointer\n");

	if (ring->use_doorbell) {

		u64 *wb = (u64 *)&adev->wb.wb[ring->wptr_offs];



		DRM_DEBUG("Using doorbell -- "

				"wptr_offs == 0x%08x "

				"lower_32_bits(ring->wptr) << 2 == 0x%08x "
@@ -301,8 +303,7 @@ static void sdma_v4_0_ring_set_wptr(struct amdgpu_ring *ring) 
				lower_32_bits(ring->wptr << 2),

				upper_32_bits(ring->wptr << 2));

		/* XXX check if swapping is necessary on BE */

		adev->wb.wb[ring->wptr_offs] = lower_32_bits(ring->wptr << 2);

		adev->wb.wb[ring->wptr_offs + 1] = upper_32_bits(ring->wptr << 2);

		WRITE_ONCE(*wb, (ring->wptr << 2));

		DRM_DEBUG("calling WDOORBELL64(0x%08x, 0x%016llx)\n",

				ring->doorbell_index, ring->wptr << 2);