linux-kernel - Re: [PATCH 2/2] can: m_can: add deep Suspend/Resume support

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Message-ID: <b340a104-9974-d575-670d-5b360dddb266@pengutronix.de>
Date:   Wed, 3 May 2017 14:44:32 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>,
        wg@...ndegger.com, mario.huettel@....net, socketcan@...tkopp.net
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, alexandre.belloni@...e-electrons.com,
        thomas.petazzoni@...e-electrons.com
Subject: Re: [PATCH 2/2] can: m_can: add deep Suspend/Resume support

On 05/03/2017 02:28 PM, Quentin Schulz wrote:
> Hi Marc,
> 
> On 03/05/2017 14:16, Marc Kleine-Budde wrote:
>> On 05/03/2017 02:11 PM, Quentin Schulz wrote:
>>> This adds Power Management deep Suspend/Resume support for Bosch M_CAN
>>> chip.
>>>
>>> When the chip resumes from deep sleep, the RAM needs to be initialized
>>> as it is done when the driver probes. The net interface also needs to be
>>> closed and reopened to be fully functional.
>>
>> Are you sure it's the closing and opening of the net interface. Maybe
>> it's the m_can_start() and/or the subsequent m_can_chip_config()?
>>
> 
> You're right. The chip needs to be completely reinitialized (clocks,
> chip itself) and it also closes and reopens the interface if I'm correct
> with close_candev and open_candev.
> I'm sending a v2 right away to fix the commit log.

:) I mean to fix the call to the proper function and _not_ calling
close() open().

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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