linux-kernel - Re: [PATCH] drm/msm/a6xx: Fix speed-bin detection vs probe-defer

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Message-ID: <97429a67-e763-4226-828c-8381a2abe9f9@quicinc.com>
Date:   Tue, 15 Nov 2022 01:29:46 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     Rob Clark <robdclark@...il.com>, <dri-devel@...ts.freedesktop.org>
CC:     <freedreno@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        "Rob Clark" <robdclark@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Chia-I Wu <olvaffe@...il.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        "Douglas Anderson" <dianders@...omium.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/a6xx: Fix speed-bin detection vs probe-defer

On 11/15/2022 1:11 AM, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> If we get an error (other than -ENOENT) we need to propagate that up the
> stack.  Otherwise if the nvmem driver hasn't probed yet, we'll end up with
> whatever OPP(s) are represented by bit zero.
>
> Fixed: fe7952c629da ("drm/msm: Add speed-bin support to a618 gpu")
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 7fe60c65a1eb..96de2202c86c 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -1956,7 +1956,7 @@ static int a6xx_set_supported_hw(struct device *dev, struct adreno_rev rev)
>   		DRM_DEV_ERROR(dev,
>   			      "failed to read speed-bin (%d). Some OPPs may not be supported by hardware",
I just noticed and was going to send a similar fix. We should remove ". 
Some OPPs may not be supported by hardware" here.

Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>

Btw, on msm-next-external-fixes + this fix,  I still see boot up issue 
in herobrine due to drm_dev_alloc() failure with -ENOSPC error.

-Akhil.
>   			      ret);
> -		goto done;
> +		return ret;
>   	}
>   
>   	supp_hw = fuse_to_supp_hw(dev, rev, speedbin);