On Tue, Jul 23, 2019 at 9:41 AM Colin King <colin.king@xxxxxxxxxxxxx> wrote:
>
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> The pointer 'ring' is being assigned a value that is never
> read, hence the assignment is redundant and can be removed.
>
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> index 93b3500e522b..a2a8ca942f34 100644
> --- a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
> @@ -1331,7 +1331,6 @@ static int vcn_v1_0_pause_dpg_mode(struct amdgpu_device *adev,
> WREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_CNTL,
> UVD_JRBC_RB_CNTL__RB_RPTR_WR_EN_MASK);
>
> - ring = &adev->vcn.inst->ring_dec;
> WREG32_SOC15(UVD, 0, mmUVD_RBC_RB_WPTR,
> RREG32_SOC15(UVD, 0, mmUVD_SCRATCH2) & 0x7FFFFFFF);
> SOC15_WAIT_ON_RREG(UVD, 0, mmUVD_POWER_STATUS,
While we don't use ring here, I think the assignment is useful to
delineate that we are no longer working with the jpeg ring, but rather
the decode ring. The mmUVD_RBC_RB_WPTR register is part of the decode
ring, not jpeg. We would normally use the ring->wptr like we do for
the other rings, but in this particular case, the value happens to be
shadowed to a scratch register due to the way the dynamic power gating
works on that ring.
Alex
> --
> 2.20.1
>
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