linux-kernel - Re: [PATCH v4] usb: ohci-at91: Forcibly suspend ports while USB suspend

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Message-ID: <20160621153041.GW5809@piout.net>
Date:	Tue, 21 Jun 2016 17:30:41 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH v4] usb: ohci-at91: Forcibly suspend ports while USB
 suspend

On 21/06/2016 at 09:32:44 +0800, Wenyou Yang wrote :
> In order to save power consumption, as a workaround, forcibly suspend
> the USB PORTA/B/C via setting the SUSPEND_A/B/C bits of OHCI Interrupt
> Configuration Register in the SFR while OHCI USB suspend.
> 
> This suspend operation must be done before the USB clock is disabled,
> resume after the USB clock is enabled.
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com