linux-kernel - Re: [PATCH 5/5 v4] mfd: omap: usb: Runtime PM support

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Message-ID: <20110810163142.GA10156@google.com>
Date:	Wed, 10 Aug 2011 09:31:42 -0700
From:	Todd Poynor <toddpoynor@...gle.com>
To:	Keshava Munegowda <keshava_mgowda@...com>
Cc:	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, balbi@...com, gadiyar@...com,
	sameo@...ux.intel.com, parthab@...ia.ti.com, tony@...mide.com,
	khilman@...com, b-cousson@...com, paul@...an.com,
	johnstul@...ibm.com, vishwanath.bs@...com
Subject: Re: [PATCH 5/5 v4] mfd: omap: usb: Runtime PM support

On Tue, Aug 09, 2011 at 07:45:09PM +0530, Keshava Munegowda wrote:
> From: Keshava Munegowda <Keshava_mgowda@...com>
> 
> The usbhs core driver does not enable/disable the intefrace and


typo: interface

> fucntional clocks; These clocks are handled by hwmod and runtime pm,


typo: functional

> hence insted of the clock enable/disable, the runtime pm APIS are
> used. however,the port clocks are handled by the usbhs core.
> 
> Signed-off-by: Keshava Munegowda <keshava_mgowda@...com>

...
> @@ -913,12 +598,15 @@ static int usbhs_enable(struct device *dev)
>  				(pdata->ehci_data->reset_gpio_port[1], 1);
>  	}
>  
> -end_count:
> -	omap->count++;
> +	pm_runtime_put_sync(dev);
>  	spin_unlock_irqrestore(&omap->lock, flags);

Is pm_runtime_irq_safe() needed (else I think runtime PM callbacks may
re-enable IRQs... or there's the new *_suspend runtime PM calls that
may avoid this)?

...
> @@ -266,10 +261,12 @@ static int ehci_hcd_omap_remove(struct platform_device *pdev)
>  	struct usb_hcd *hcd	= dev_get_drvdata(dev);
>  
>  	usb_remove_hcd(hcd);
> -	omap_usbhs_disable(dev);
>  	disable_put_regulator(dev->platform_data);
> -	iounmap(hcd->regs);
>  	usb_put_hcd(hcd);
> +	iounmap(hcd->regs);


usb_put_hcd may release the hcd, needs to be after the deref for
iounmap.

> +	pm_runtime_put_sync(dev);
> +	pm_runtime_disable(dev);


Todd
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