linux-kernel - Re: [PATCH 2/2] ASoC: tegra: probe deferral error reporting

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Date:   Thu, 26 Jul 2018 10:34:30 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Marcel Ziswiler <marcel@...wiler.com>
Cc:     alsa-devel@...a-project.org, linux-tegra@...r.kernel.org,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-tegra-owner@...r.kernel.org
Subject: Re: [PATCH 2/2] ASoC: tegra: probe deferral error reporting

On 20.07.2018 10:04, Marcel Ziswiler wrote:
> From: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> 
> Actually report the error codes from of_get_named_gpio() resp.
> devm_gpio_request_one() upon trying to get the codec reset resp. sync
> GPIOs which may as well just be a probe deferrals.
> 
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> 
> ---
> 
>  sound/soc/tegra/tegra20_ac97.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/tegra/tegra20_ac97.c b/sound/soc/tegra/tegra20_ac97.c
> index 682ef33afb5f..4875512f0732 100644
> --- a/sound/soc/tegra/tegra20_ac97.c
> +++ b/sound/soc/tegra/tegra20_ac97.c
> @@ -351,18 +351,21 @@ static int tegra20_ac97_platform_probe(struct
> platform_device *pdev)
>  		ret = devm_gpio_request_one(&pdev->dev, ac97->reset_gpio,
>  					    GPIOF_OUT_INIT_HIGH, "codec-reset");
>  		if (ret) {
> -			dev_err(&pdev->dev, "could not get codec-reset GPIO\n");
> +			dev_err(&pdev->dev, "could not get codec-reset GPIO: "
> +					    "%d\n", ret);
>  			goto err_clk_put;
>  		}
>  	} else {
> -		dev_err(&pdev->dev, "no codec-reset GPIO supplied\n");
> +		ret = ac97->reset_gpio;
> +		dev_err(&pdev->dev, "no codec-reset GPIO supplied: %d\n", ret);
>  		goto err_clk_put;
>  	}
>  
>  	ac97->sync_gpio = of_get_named_gpio(pdev->dev.of_node,
>  					    "nvidia,codec-sync-gpio", 0);
>  	if (!gpio_is_valid(ac97->sync_gpio)) {
> -		dev_err(&pdev->dev, "no codec-sync GPIO supplied\n");
> +		ret = ac97->sync_gpio;
> +		dev_err(&pdev->dev, "no codec-sync GPIO supplied: %d\n", ret);
>  		goto err_clk_put;

This will still print an error on defer, which is not really nice. I
suggest to suppress defer errors completely, e.g. by:

		if (ret != -EPROBE_DEFER)
			dev_err(&pdev->dev, "no codec-sync GPIO supplied: %d\n", ret);

The driver framework provides debug level prints if debugging of
deferred probing is required.

--
Stefan


>  	}