linux-kernel - Re: [PATCH v8 4/7] can: Add Nuvoton NCT6694 CANFD support

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Message-ID: <CAOoeyxUgRK=Rw0XuYD0raGmv9RGxqMHXofmyytXd+bRxEaBpxQ@mail.gmail.com>
Date: Mon, 17 Mar 2025 10:08:09 +0800
From: Ming Yu <a0282524688@...il.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Vincent Mailhol <mailhol.vincent@...adoo.fr>, linux-kernel@...r.kernel.org, 
	linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, 
	linux-watchdog@...r.kernel.org, linux-hwmon@...r.kernel.org, 
	linux-rtc@...r.kernel.org, linux-usb@...r.kernel.org, tmyu0@...oton.com, 
	lee@...nel.org, linus.walleij@...aro.org, brgl@...ev.pl, 
	andi.shyti@...nel.org, andrew+netdev@...n.ch, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	wim@...ux-watchdog.org, linux@...ck-us.net, jdelvare@...e.com, 
	alexandre.belloni@...tlin.com
Subject: Re: [PATCH v8 4/7] can: Add Nuvoton NCT6694 CANFD support

Dear Marc,

Thank you for reviewing,

Marc Kleine-Budde <mkl@...gutronix.de> 於 2025年2月27日 週四 下午10:17寫道：
>
> On 27.02.2025 11:08:50, Vincent Mailhol wrote:
> > > +static int nct6694_can_stop(struct net_device *ndev)
> > > +{
> > > +   struct nct6694_can_priv *priv = netdev_priv(ndev);
> > > +
> > > +   priv->can.ctrlmode = CAN_CTRLMODE_LISTENONLY;
> >
> > Hmmm, when Marc asked you to put the device in listen only mode, I think
> > he meant that you set it on the device side (i.e. flag
> > NCT6694_CAN_SETTING_CTRL1_MON) and not on the driver side. If you set
> > CAN_CTRLMODE_LISTENONLY flag, that will be reported in the netlink
> > interface. So you should not change that flag.
>
> ACK
>
> > But before that, did you check the datasheet? Don't you have a device
> > flag to actually turn the device off (e.g. sleep mode)?
>
> Please test that the ifup -> ifdown -> ifup sequence works properly,
> even on a busy bus and on a bus without with a 2nd CAN station that is
> sending and you are the only receiver.
>

Understood.


Best regards,
Ming