netdev - Re: [PATCH v2 2/5] usb: phy: omap-usb2: use the new generic PHY framework

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Date:	Tue, 19 Feb 2013 10:11:57 +0200
From:	Felipe Balbi <balbi@...com>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	<rob@...dley.net>, <tony@...mide.com>, <linux@....linux.org.uk>,
	<eballetbo@...il.com>, <javier@...hile0.org>, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <akpm@...ux-foundation.org>,
	<mchehab@...hat.com>, <cesarb@...arb.net>, <davem@...emloft.net>,
	<arnd@...db.de>, <santosh.shilimkar@...com>,
	<broonie@...nsource.wolfsonmicro.com>, <swarren@...dia.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] usb: phy: omap-usb2: use the new generic PHY
 framework

Hi,

On Tue, Feb 19, 2013 at 11:23:15AM +0530, Kishon Vijay Abraham I wrote:
> Used the generic PHY framework API to create the PHY. omap_usb2_suspend
> is split into omap_usb_suspend and omap_usb_resume in order to align
> with the new framework.
> 
> However using the old USB PHY library cannot be completely removed
> because OTG is intertwined with PHY and moving to the new framework
> will break OTG. Once we have a separate OTG state machine, we
> can get rid of the USB PHY library.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/usb/phy/omap-usb2.c  |   49 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/omap_usb.h |    3 +++
>  2 files changed, 52 insertions(+)
> 
> diff --git a/drivers/usb/phy/omap-usb2.c b/drivers/usb/phy/omap-usb2.c
> index 844ab68..924ae59 100644
> --- a/drivers/usb/phy/omap-usb2.c
> +++ b/drivers/usb/phy/omap-usb2.c
> @@ -119,9 +119,48 @@ static int omap_usb2_suspend(struct usb_phy *x, int suspend)
>  	return 0;
>  }
>  
> +static int omap_usb_suspend(struct phy_descriptor *desc)
> +{
> +	struct omap_usb *phy = desc_to_omapusb(desc);
> +
> +	if (!phy->is_suspended) {

I wonder if it wouldn't be better to have some refcounting done by phy
framework itself so that this only gets called when phy->refcount == 0

> +		omap_control_usb_phy_power(phy->control_dev, 0);

coudln't you move this to ->runtime_suspend() ?

> +		pm_runtime_put_sync(phy->dev);
> +		phy->is_suspended = 1;
> +	}
> +
> +	return 0;
> +}
> +
> +static int omap_usb_resume(struct phy_descriptor *desc)
> +{
> +	u32 ret;
> +	struct omap_usb *phy = desc_to_omapusb(desc);
> +
> +	if (phy->is_suspended) {
> +		ret = pm_runtime_get_sync(phy->dev);
> +		if (ret < 0) {
> +			dev_err(phy->dev, "get_sync failed with err %d\n",
> +									ret);
> +			return ret;
> +		}
> +		omap_control_usb_phy_power(phy->control_dev, 1);

likewise, this could go to ->runtime_resume().

-- 
balbi

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