On 27.06.25 05:39, Alex Deucher wrote:
> There no need to save the ring ptrs. Just reset them.
> This cleans up a conditional in the resume code.
>
> Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Acked-by: Christian König <christian.koe...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c | 27 +++++++++-----------------
> 1 file changed, 9 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> index 5a1098bdd8256..5f4c6a99b06dc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> @@ -680,12 +680,11 @@ static void sdma_v5_0_enable(struct amdgpu_device
> *adev, bool enable)
> *
> * @adev: amdgpu_device pointer
> * @i: instance
> - * @restore: used to restore wptr when restart
> *
> - * Set up the gfx DMA ring buffers and enable them. On restart, we will
> restore wptr and rptr.
> + * Set up the gfx DMA ring buffers and enable them.
> * Return 0 for success.
> */
> -static int sdma_v5_0_gfx_resume_instance(struct amdgpu_device *adev, int i,
> bool restore)
> +static int sdma_v5_0_gfx_resume_instance(struct amdgpu_device *adev, int i)
> {
> struct amdgpu_ring *ring;
> u32 rb_cntl, ib_cntl;
> @@ -713,17 +712,10 @@ static int sdma_v5_0_gfx_resume_instance(struct
> amdgpu_device *adev, int i, bool
> WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_CNTL), rb_cntl);
>
> /* Initialize the ring buffer's read and write pointers */
> - if (restore) {
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_RPTR), lower_32_bits(ring->wptr << 2));
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_RPTR_HI), upper_32_bits(ring->wptr << 2));
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR), lower_32_bits(ring->wptr << 2));
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR_HI), upper_32_bits(ring->wptr << 2));
> - } else {
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_RPTR), 0);
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_RPTR_HI), 0);
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR), 0);
> - WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR_HI), 0);
> - }
> + WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_RPTR), 0);
> + WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_RPTR_HI), 0);
> + WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR), 0);
> + WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR_HI), 0);
> /* setup the wptr shadow polling */
> wptr_gpu_addr = ring->wptr_gpu_addr;
> WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_WPTR_POLL_ADDR_LO),
> @@ -751,8 +743,7 @@ static int sdma_v5_0_gfx_resume_instance(struct
> amdgpu_device *adev, int i, bool
> WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_RB_BASE_HI),
> ring->gpu_addr >> 40);
>
> - if (!restore)
> - ring->wptr = 0;
> + ring->wptr = 0;
>
> /* before programing wptr to a less value, need set minor_ptr_update
> first */
> WREG32_SOC15_IP(GC, sdma_v5_0_get_reg_offset(adev, i,
> mmSDMA0_GFX_MINOR_PTR_UPDATE), 1);
> @@ -851,7 +842,7 @@ static int sdma_v5_0_gfx_resume(struct amdgpu_device
> *adev)
> int i, r;
>
> for (i = 0; i < adev->sdma.num_instances; i++) {
> - r = sdma_v5_0_gfx_resume_instance(adev, i, false);
> + r = sdma_v5_0_gfx_resume_instance(adev, i);
> if (r)
> return r;
> }
> @@ -1616,7 +1607,7 @@ static int sdma_v5_0_restore_queue(struct amdgpu_ring
> *ring)
> freeze = REG_SET_FIELD(freeze, SDMA0_FREEZE, FREEZE, 0);
> WREG32(sdma_v5_0_get_reg_offset(adev, inst_id, mmSDMA0_FREEZE), freeze);
>
> - r = sdma_v5_0_gfx_resume_instance(adev, inst_id, true);
> + r = sdma_v5_0_gfx_resume_instance(adev, inst_id);
> amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
>
> return r;
