linux-kernel - Re: [PATCH v2 2/2] Revert "drm/msm/a6xx: Poll for GBIF unhalt status in hw

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Date: Tue, 25 Jun 2024 23:18:30 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	Akhil P Oommen <quic_akhilpo@...cinc.com>
Subject: Re: [PATCH v2 2/2] Revert "drm/msm/a6xx: Poll for GBIF unhalt status
 in hw_init"

On Tue, 25 Jun 2024 at 21:54, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> Commit c9707bcbd0f3 ("drm/msm/adreno: De-spaghettify the use of memory

ID is not present in next

> barriers") made some fixups relating to write arrival, ensuring that
> the GPU's memory interface has *really really really* been told to come
> out of reset. That in turn rendered the hacky commit being reverted no
> longer necessary.
>
> Get rid of it.
>
> This reverts commit b77532803d11f2b03efab2ebfd8c0061cd7f8b30.

b77532803d11 ("drm/msm/a6xx: Poll for GBIF unhalt status in hw_init")

>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 4083d0cad782..03e23eef5126 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -867,10 +867,6 @@ static int hw_init(struct msm_gpu *gpu)
>                 gpu_read(gpu, REG_A6XX_RBBM_GBIF_HALT);
>         }
>
> -       /* Some GPUs are stubborn and take their sweet time to unhalt GBIF! */
> -       if (adreno_is_a7xx(adreno_gpu) && a6xx_has_gbif(adreno_gpu))
> -               spin_until(!gpu_read(gpu, REG_A6XX_GBIF_HALT_ACK));
> -
>         gpu_write(gpu, REG_A6XX_RBBM_SECVID_TSB_CNTL, 0);
>
>         if (adreno_is_a619_holi(adreno_gpu))
>
> --
> 2.45.2
>


-- 
With best wishes
Dmitry