linux-kernel - Re: [PATCH 2/2] usb: dwc3: of_simple: don't call pm_runtime_set

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Message-ID: <87k1rlcok2.fsf@linux.intel.com>
Date:   Wed, 30 May 2018 15:31:41 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Roger Quadros <rogerq@...com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roger Quadros <rogerq@...com>
Subject: Re: [PATCH 2/2] usb: dwc3: of_simple: don't call pm_runtime_set_active()

Roger Quadros <rogerq@...com> writes:

> Don't call pm_runtime_set_active() as it will prevent the device
> from being activated in the next pm_runtime_get_sync() call.
>
> Also call pm_runtime_get_sync() before of_platform_populate().
>
> Signed-off-by: Roger Quadros <rogerq@...com>

This patch is wrong.

> ---
>  drivers/usb/dwc3/dwc3-of-simple.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
> index e98d221..2cbb5c0 100644
> --- a/drivers/usb/dwc3/dwc3-of-simple.c
> +++ b/drivers/usb/dwc3/dwc3-of-simple.c
> @@ -121,6 +121,9 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_resetc_assert;
>  
> +	pm_runtime_enable(dev);
> +	pm_runtime_get_sync(dev);

No, this is the wrong way to do things. My device should be enabled
already from probe, specially since I have already enabled clocks.

>  	ret = of_platform_populate(np, NULL, NULL, dev);
>  	if (ret) {
>  		for (i = 0; i < simple->num_clocks; i++) {
> @@ -131,10 +134,6 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
>  		goto err_resetc_assert;
>  	}
>  
> -	pm_runtime_set_active(dev);
> -	pm_runtime_enable(dev);
> -	pm_runtime_get_sync(dev);

this hunk is not wrong at all.

-- 
balbi

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