linux-kernel - Re: [Freedreno] [PATCH v4 2/3] drm/msm: reset devfreq freq_table/max_state before devfreq_add_device

Open Source and information security mailing list archives

Date:   Mon, 13 Jul 2020 17:46:14 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     freedreno@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>, Rob Clark <robdclark@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>
Subject: Re: [Freedreno] [PATCH v4 2/3] drm/msm: reset devfreq
 freq_table/max_state before devfreq_add_device

On Mon, Jul 13, 2020 at 06:53:41PM -0400, Jonathan Marek wrote:
> These never get set back to 0 when probing fails, so an attempt to probe
> again results in broken behavior. Fix the problem by setting thse to zero
> before they are used.

Reviewed-by: Jordan Crouse <jcrouse@...eaurora.org>

> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  drivers/gpu/drm/msm/msm_gpu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index a22d30622306..aa9775ab52f0 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -93,7 +93,11 @@ static void msm_devfreq_init(struct msm_gpu *gpu)
>  	/*
>  	 * Don't set the freq_table or max_state and let devfreq build the table
>  	 * from OPP
> +	 * After a deferred probe, these may have be left to non-zero values,
> +	 * so set them back to zero before creating the devfreq device
>  	 */
> +	msm_devfreq_profile.freq_table = NULL;
> +	msm_devfreq_profile.max_state = 0;
>  
>  	gpu->devfreq.devfreq = devm_devfreq_add_device(&gpu->pdev->dev,
>  			&msm_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
> -- 
> 2.26.1
> 
> _______________________________________________
> Freedreno mailing list
> Freedreno@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno

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