Hi Alex,
No, it won't break gfxoff. The "gfxoff broken" issue we saw last time has been fixed on CP firmware update for Renoir, and this patch changes doorbell range setting specifically for Renoir, not covering the other ASICs. I think it is better to change doorbell range setting per ASIC to mitigate possible side effects.
BRs,
Yifan
-----Original Message-----
From: Alex Deucher <alexdeucher@xxxxxxxxx>
Sent: Wednesday, July 28, 2021 9:46 PM
To: Zhang, Yifan <Yifan1.Zhang@xxxxxxx>
Cc: amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v2] drm/amdgpu: fix the doorbell missing when in CGPG issue for renoir.
On Wed, Jul 28, 2021 at 2:10 AM Yifan Zhang <yifan1.zhang@xxxxxxx> 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@xxxxxxx>
I assume this won't break gfxoff? The last time we changed this, it broke a bunch of scenarios. Won't this cause just about all doorbells to wake gfx?
Alex
> ---
> drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 10 +++++++++-
> 1 file changed, 9 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 03acc777adf7..70b64b510743 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -3675,7 +3675,15 @@ 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);
> - WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
> + /* In renoir, if GC has entered CGPG, ringing doorbell > first page
> + * doesn't wakeup GC. Enlarge CP_MEC_DOORBELL_RANGE_UPPER to
> + * workaround this issue.
> + */
> + if (adev->asic_type == CHIP_RENOIR)
> + WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
> + (adev->doorbell.size - 4));
> + else
> + WREG32_SOC15(GC, 0,
> + mmCP_MEC_DOORBELL_RANGE_UPPER,
> (adev->doorbell_index.userqueue_end * 2) << 2);
> }
>
> --
> 2.25.1
>
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