linux-kernel - Re: [PATCH 1/6] usb: host: add has_tdi_phy

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Date:	Wed, 31 Jul 2013 14:35:47 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
cc:	balbi@...com, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<swarren@...dotorg.org>, <gregkh@...uxfoundation.org>,
	Matthieu CASTET <matthieu.castet@...rot.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH 1/6] usb: host: add has_tdi_phy_lpm capability bit

On Wed, 31 Jul 2013, Tuomas Tynkkynen wrote:

> The has_hostpc capability bit indicates that the host controller has the
> HOSTPC register extensions, but at the same time enables clock disabling
> power saving features with the PHY Low Power Clock Disable (PHCD) bit.
> 
> However, some host controllers have the HOSTPC extensions but don't
> support the low-power feature, so the PHCD bit must not be set on those
> controllers. Add a separate capability bit for the low-power feature
> instead, and change all existing users of has_hostpc to use this new
> capability bit.
> 
> The idea for this commit is taken from an old 2012 commit that never got
> merged ("disociate chipidea PHY low power suspend control from hostpc")
> 
> Inspired-by: Matthieu CASTET <matthieu.castet@...rot.com>
> Signed-off-by: Tuomas Tynkkynen <ttynkkynen@...dia.com>

Acked-by: Alan Stern <stern@...land.harvard.edu>

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