On Mon, May 8, 2017 at 1:01 PM, Gustavo A. R. Silva
<garsilva at embeddedor.com> wrote:
> Local variable use_doorbell is assigned to a constant value and it is never
> updated again. Remove this variable and the dead code it guards.
>
> Addresses-Coverity-ID: 1401828
> Signed-off-by: Gustavo A. R. Silva <garsilva at embeddedor.com>
This code is already removed in the latest code queued for the next
kernel for gfx8. For gfx7, I think Andres' priority patch set fixes
this up for gfx7.
Alex
> ---
> drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 53 +++++++++++++----------------------
> 1 file changed, 20 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> index 67afc90..e824c2b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> @@ -4991,7 +4991,6 @@ static int gfx_v8_0_cp_compute_resume(struct amdgpu_device *adev)
> {
> int r, i, j;
> u32 tmp;
> - bool use_doorbell = true;
> u64 hqd_gpu_addr;
> u64 mqd_gpu_addr;
> u64 eop_gpu_addr;
> @@ -5079,11 +5078,7 @@ static int gfx_v8_0_cp_compute_resume(struct amdgpu_device *adev)
>
> /* enable doorbell? */
> tmp = RREG32(mmCP_HQD_PQ_DOORBELL_CONTROL);
> - if (use_doorbell) {
> - tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_EN, 1);
> - } else {
> - tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_EN, 0);
> - }
> + tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_EN, 1);
> WREG32(mmCP_HQD_PQ_DOORBELL_CONTROL, tmp);
> mqd->cp_hqd_pq_doorbell_control = tmp;
>
> @@ -5157,29 +5152,23 @@ static int gfx_v8_0_cp_compute_resume(struct amdgpu_device *adev)
> mqd->cp_hqd_pq_wptr_poll_addr_hi);
>
> /* enable the doorbell if requested */
> - if (use_doorbell) {
> - if ((adev->asic_type == CHIP_CARRIZO) ||
> - (adev->asic_type == CHIP_FIJI) ||
> - (adev->asic_type == CHIP_STONEY) ||
> - (adev->asic_type == CHIP_POLARIS11) ||
> - (adev->asic_type == CHIP_POLARIS10) ||
> - (adev->asic_type == CHIP_POLARIS12)) {
> - WREG32(mmCP_MEC_DOORBELL_RANGE_LOWER,
> - AMDGPU_DOORBELL_KIQ << 2);
> - WREG32(mmCP_MEC_DOORBELL_RANGE_UPPER,
> - AMDGPU_DOORBELL_MEC_RING7 << 2);
> - }
> - tmp = RREG32(mmCP_HQD_PQ_DOORBELL_CONTROL);
> - tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL,
> - DOORBELL_OFFSET, ring->doorbell_index);
> - tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_EN, 1);
> - tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_SOURCE, 0);
> - tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_HIT, 0);
> - mqd->cp_hqd_pq_doorbell_control = tmp;
> -
> - } else {
> - mqd->cp_hqd_pq_doorbell_control = 0;
> + if ((adev->asic_type == CHIP_CARRIZO) ||
> + (adev->asic_type == CHIP_FIJI) ||
> + (adev->asic_type == CHIP_STONEY) ||
> + (adev->asic_type == CHIP_POLARIS11) ||
> + (adev->asic_type == CHIP_POLARIS10) ||
> + (adev->asic_type == CHIP_POLARIS12)) {
> + WREG32(mmCP_MEC_DOORBELL_RANGE_LOWER, AMDGPU_DOORBELL_KIQ << 2);
> + WREG32(mmCP_MEC_DOORBELL_RANGE_UPPER, AMDGPU_DOORBELL_MEC_RING7 << 2);
> }
> + tmp = RREG32(mmCP_HQD_PQ_DOORBELL_CONTROL);
> + tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL,
> + DOORBELL_OFFSET, ring->doorbell_index);
> + tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_EN, 1);
> + tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_SOURCE, 0);
> + tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL, DOORBELL_HIT, 0);
> + mqd->cp_hqd_pq_doorbell_control = tmp;
> +
> WREG32(mmCP_HQD_PQ_DOORBELL_CONTROL,
> mqd->cp_hqd_pq_doorbell_control);
>
> @@ -5217,11 +5206,9 @@ static int gfx_v8_0_cp_compute_resume(struct amdgpu_device *adev)
> amdgpu_bo_unreserve(ring->mqd_obj);
> }
>
> - if (use_doorbell) {
> - tmp = RREG32(mmCP_PQ_STATUS);
> - tmp = REG_SET_FIELD(tmp, CP_PQ_STATUS, DOORBELL_ENABLE, 1);
> - WREG32(mmCP_PQ_STATUS, tmp);
> - }
> + tmp = RREG32(mmCP_PQ_STATUS);
> + tmp = REG_SET_FIELD(tmp, CP_PQ_STATUS, DOORBELL_ENABLE, 1);
> + WREG32(mmCP_PQ_STATUS, tmp);
>
> gfx_v8_0_cp_compute_enable(adev, true);
>
> --
> 2.5.0
>
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> amd-gfx at lists.freedesktop.org
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