[PATCH 1/2] drm/amdgpu/gfx9: fix the doorbell missing when in CGPG issue.

[Alex Deucher]

Series is:
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

On Tue, Jun 15, 2021 at 6:04 AM Yifan Zhang <yifan1.zhang at amd.com> wrote:
>
> If GC has entered CGPG, ringing doorbell > first page doesn't wakeup GC.
> Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround this issue.
>
> Signed-off-by: Yifan Zhang <yifan1.zhang at amd.com>
> Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> index 044076ec1d03..922420a2c102 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -3675,8 +3675,12 @@ static int gfx_v9_0_kiq_init_register(struct amdgpu_ring *ring)
>         if (ring->use_doorbell) {
>                 WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_LOWER,
>                                         (adev->doorbell_index.kiq * 2) << 2);
> +               /* If GC has entered CGPG, ringing doorbell > first page doesn't
> +                * wakeup GC. Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround
> +                * this issue.
> +                */
>                 WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
> -                                       (adev->doorbell_index.userqueue_end * 2) << 2);
> +                                       (adev->doorbell.size - 4));
>         }
>
>         WREG32_SOC15_RLC(GC, 0, mmCP_HQD_PQ_DOORBELL_CONTROL,
> --
> 2.25.1
>
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