linux-kernel - Re: [PATCH v8 2/2] usb: ehci-exynos: Change to use phy provided by the generic phy framework

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Message-ID: <Pine.LNX.4.44L0.1404251039210.1140-100000@iolanthe.rowland.org>
Date:	Fri, 25 Apr 2014 10:41:50 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Vivek Gautam <gautam.vivek@...sung.com>
cc:	linux-usb@...r.kernel.org, <linux-samsung-soc@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<kgene.kim@...sung.com>, <k.debski@...sung.com>,
	<jg1.han@...sung.com>
Subject: Re: [PATCH v8 2/2] usb: ehci-exynos: Change to use phy provided by
 the generic phy framework

On Fri, 25 Apr 2014, Vivek Gautam wrote:

> From: Kamil Debski <k.debski@...sung.com>
> 
> Add the phy provider, supplied by new Exynos-usb2phy using
> Generic phy framework.
> Keeping the support for older USB phy intact right now, in order
> to prevent any functionality break in absence of relevant
> device tree side change for ehci-exynos.
> Once we move to new phy in the device nodes for ehci, we can
> remove the support for older phys.
> 
> Signed-off-by: Kamil Debski <k.debski@...sung.com>
> [gautam.vivek@...sung.com: Addressed review comments from mailing list]
> [gautam.vivek@...sung.com: Kept the code for old usb-phy, and just
> added support for new exynos5-usb2phy in generic phy framework]
> [gautam.vivek@...sung.com: Edited the commit message]
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>

> +static int exynos_ehci_phyg_off(struct phy *phy[])
> +{
> +	int i;
> +	int ret = 0;
> +
> +	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
> +		if (phy[i])
> +			ret = phy_power_off(phy[i]);
> +
> +	return ret;
> +}

Same comment as in the OHCI driver about ret.

> @@ -175,6 +269,7 @@ skip_phy:
>  fail_add_hcd:
>  	if (exynos_ehci->phy)
>  		usb_phy_shutdown(exynos_ehci->phy);
> +	exynos_ehci_phyg_off(exynos_ehci->phy_g);
>  fail_io:
>  	clk_disable_unprepare(exynos_ehci->clk);
>  fail_clk:
> @@ -195,6 +290,8 @@ static int exynos_ehci_remove(struct platform_device *pdev)
>  	if (exynos_ehci->phy)
>  		usb_phy_shutdown(exynos_ehci->phy);
>  
> +	exynos_ehci_phyg_off(exynos_ehci->phy_g);
> +

In both these places, you need to test exynos_ehci->phyg before calling 
exynos_ehci_phyg_off().

Maybe it would help to add exynos_ehci_phy_enable/disable routines, 
like in the OHCI driver.

Alan Stern

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