[PATCH] clk: qcom: gdsc: WARN when failing to toggle

[PATCH] clk: qcom: gdsc: WARN when failing to toggle

[Bjorn Andersson]

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@linaro.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)
-- 
2.18.0

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

[Jeffrey Hugo]

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@linaro.org>

Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.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.

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

[Marc Gonzalez]

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@linaro.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@free.fr>

Regards.

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

[Stephen Boyd]

Quoting Bjorn Andersson (2019-05-03 17:17:36)
> 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@linaro.org>
> ---

Applied to clk-next