linux-kernel - Re: [PATCH] clk: qcom: gdsc: WARN when failing to toggle

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Date:   Mon, 20 May 2019 10:14:41 +0200
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     MSM <linux-arm-msm@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: qcom: gdsc: WARN when failing to toggle

On 04/05/2019 02:17, Bjorn Andersson wrote:

> Failing to toggle a GDSC as the driver core is attaching the
> power-domain to a device will cause a silent probe deferral. Provide an
> explicit warning to the developer, in order to reduce the amount of time
> it take to debug this.

"it takes"

> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/clk/qcom/gdsc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
> index dd63aa36b092..6a8a4996dde3 100644
> --- a/drivers/clk/qcom/gdsc.c
> +++ b/drivers/clk/qcom/gdsc.c
> @@ -149,7 +149,9 @@ static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
>  		udelay(1);
>  	}
>  
> -	return gdsc_poll_status(sc, status);
> +	ret = gdsc_poll_status(sc, status);
> +	WARN(ret, "%s status stuck at 'o%s'", sc->pd.name, status ? "ff" : "n");
> +	return ret;

In my opinion, the minor obfuscation of "o%s", foo ? "ff" : "n"
does not justify the tiny space savings.

I'd spell it out: "%s", foo ? "off" : "on"

In any event:

Reviewed-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>

Regards.