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

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Date:   Fri, 17 May 2019 13:16:39 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: gdsc: WARN when failing to toggle

On 5/3/2019 6:17 PM, 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.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Reviewed-by: Jeffrey Hugo <jhugo@...eaurora.org>
Tested-by: Jeffrey Hugo <jhugo@...eaurora.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;
>   }
>   
>   static inline int gdsc_deassert_reset(struct gdsc *sc)
> 


-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.