linux-kernel - Re: [PATCH can-next v3 0/3] can: tcan4x5x/m_can: use standby mode when down and in suspend

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Message-ID: <20250110-truthful-adventurous-dodo-576e9e-mkl@pengutronix.de>
Date: Fri, 10 Jan 2025 11:09:03 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Sean Nyekjaer <sean@...nix.com>
Cc: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
	Vincent Mailhol <mailhol.vincent@...adoo.fr>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, linux-can@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH can-next v3 0/3] can: tcan4x5x/m_can: use standby mode
 when down and in suspend

On 03.01.2025 13:37:19, Sean Nyekjaer wrote:
> On Fri, Nov 22, 2024 at 03:52:21PM +0100, Sean Nyekjaer wrote:
> > When downing the tcan4x5x there is no reason to keep the tcan4x5x in
> > "normal" mode and waste power.
> > So set standby mode when the interface is down and normal mode when
> > interface is up.
> > 
> > Also when going into suspend, set the tcan4x5x into standby mode. The
> > tcan4x5x can still be used as a wake-source when in standby as low power
> > rx is enabled.
> > 
> > Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> > ---
> > Changes in v3:
> > - Run deinit in m_can_stop() in any case even if m_can_cccr_update_bits() fails
> > - Link to v2: https://lore.kernel.org/r/20241115-tcan-standby-v2-0-4eb02026b237@geanix.com
> > 
> > Changes in v2:
> > - Reduced code in tcan4x5x_deinit()
> > - Taken care of return values from deinit callback
> > - Link to v1: https://lore.kernel.org/r/20241111-tcan-standby-v1-0-f9337ebaceea@geanix.com
> > 
> > ---
> 
> Hi,
> 
> Anything needed from my side on this?

I think this all could be hidden behind runtime PM, but that would mean
a bigger re-write and a lot of testing. So applied to linux-can-next as
is.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
Embedded Linux                   | https://www.pengutronix.de |
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