linux-kernel - Re: [PATCH v3 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend

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Date:	Wed, 8 Jun 2016 12:45:39 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Wenyou Yang <wenyou.yang@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Pawel Moll <pawel.moll@....com>, Mark Brown <broonie@...nel.org>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] usb: ohci-at91: Forcibly suspend ports while USB
 suspend

Le 08/06/2016 12:04, Nicolas Ferre a écrit :
> Le 08/06/2016 06:15, Wenyou Yang a écrit :
>> In order to the save power consumption, as a workaround, suspend
>> forcibly the USB PORTA/B/C via set the SUSPEND_A/B/C bits of OHCI
>> Interrupt Configuration Register in the SFRs 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>
> 
> Little nitpicking below...
> 
>> ---
>>
>> Changes in v3:
>>  - Change the compatible description for more precise.
>>
>> Changes in v2:
>>  - Add compatible to support forcibly suspend the ports.
>>  - Add soc/at91/at91_sfr.h to accommodate the defines.
>>  - Add error checking for .sfr_regmap.
>>  - Remove unnecessary regmap_read() statement.
>>
>>  .../devicetree/bindings/usb/atmel-usb.txt          |  6 +-
>>  drivers/usb/host/ohci-at91.c                       | 80 +++++++++++++++++++++-
>>  include/soc/at91/at91_sfr.h                        | 29 ++++++++

Oops sorry, additional comment which is not nitpicking, this one:

We already have SFR header file in this patch:

Author: Cyrille Pitchen <cyrille.pitchen@...el.com>
Date:   Thu Mar 17 17:04:00 2016 +0100

    ARM: dts: at91: sama5d2: add SFR node

    This SFR node is looked up by the I2S controller driver to tune the
    SFR_I2SCLKSEL register.

    Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
    Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
    Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
    Acked-by: Rob Herring <robh@...nel.org>
    Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>

Which is already accepted by arm-soc guys for 4.7... So my ack
transforms into a nack, sorry...

We will have to coordinate the effort and maybe take the whole series
with us. But for sure, you'll have to use the existing
include/soc/at91/atmel-sfr.h file and build on top of it...

Bye,

>>  3 files changed, 112 insertions(+), 3 deletions(-)
>>  create mode 100644 include/soc/at91/at91_sfr.h

[..]

> 
> But you can take my:
> 
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> 
> with the little corrections listed.
> 
> Alan, We plan to take the second patch of this series with AT91 git tree
> through arm-soc. Do you agree to take this one through yours?

Alan, forget this request, we'll have to coordinate differently.

Sorry for the noise. Bye,
-- 
Nicolas Ferre