linux-kernel - Re: [PATCH v2 11/22] usb: chipidea: msm: Mark device as runtime pm active

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Date:	Mon, 11 Jul 2016 11:19:05 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Stephen Boyd <stephen.boyd@...aro.org>
Cc:	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Andy Gross <andy.gross@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Neil Armstrong <narmstrong@...libre.com>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
	Peter Chen <peter.chen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 11/22] usb: chipidea: msm: Mark device as runtime pm
 active

On Thu, Jul 07, 2016 at 03:21:02PM -0700, Stephen Boyd wrote:
> We're not properly marking the glue layer/wrapper device as
> runtime active, so runtime PM believes that the hardware state is
> inactive when we call pm_runtime_enable() in this driver. This
> causes a problem when the glue layer has a power domain
> associated with it, because runtime PM will go and disable the
> power domain to match the 'inactive' state of the device. Let's
> mark the device as active so that runtime PM doesn't improperly
> power down this device when it's actually active.
> 
> Cc: Peter Chen <peter.chen@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index 3889809fd0c4..89c1a02d69b5 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -80,6 +80,7 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, plat_ci);
>  
> +	pm_runtime_set_active(&pdev->dev);
>  	pm_runtime_no_callbacks(&pdev->dev);
>  	pm_runtime_enable(&pdev->dev);
>  

Acked-by: Peter Chen <peter.chen@....com>

-- 

Best Regards,
Peter Chen