linux-kernel - Re: [RESEND PATCH] drm/panfrost: Reduce the amount of logs on deferred probe

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Message-ID: <1858ea3d-8f33-66f4-0e71-31bf68443b24@arm.com>
Date:   Thu, 12 Sep 2019 10:36:25 +0100
From:   Steven Price <steven.price@....com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] drm/panfrost: Reduce the amount of logs on
 deferred probe

On 09/09/2019 16:51, Krzysztof Kozlowski wrote:
> There is no point to print deferred probe (and its failures to get
> resources) as an error.
> 
> In case of multiple probe tries this would pollute the dmesg.
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Looks like a good idea, however from what I can tell you haven't
completely silenced the 'error' as the return from
panfrost_regulator_init() will be -EPROBE_DEFER causing another
dev_err() output:

        err = panfrost_regulator_init(pfdev);
        if (err) {
                dev_err(pfdev->dev, "regulator init failed %d\n", err);
                goto err_out0;
        }

Can you fix that up as well? Or indeed drop it altogether since
panfrost_regulator_init() already outputs an appropriate message.

Steve

> ---
>  drivers/gpu/drm/panfrost/panfrost_device.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
> index 46b0b02e4289..2252147bc285 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_device.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_device.c
> @@ -95,7 +95,9 @@ static int panfrost_regulator_init(struct panfrost_device *pfdev)
>  		pfdev->regulator = NULL;
>  		if (ret == -ENODEV)
>  			return 0;
> -		dev_err(pfdev->dev, "failed to get regulator: %d\n", ret);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(pfdev->dev, "failed to get regulator: %d\n",
> +				ret);
>  		return ret;
>  	}
>  
>