linux-kernel - Re: [PATCH v4] can: m_can: don't enable transceiver when probing

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Date: Fri, 21 Jun 2024 10:32:28 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Martin Hundebøll <martin@...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>, Markus Schneider-Pargmann <msp@...libre.com>, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] can: m_can: don't enable transceiver when probing

On 07.06.2024 12:52:08, Martin Hundebøll wrote:
> The m_can driver sets and clears the CCCR.INIT bit during probe (both
> when testing the NON-ISO bit, and when configuring the chip). After
> clearing the CCCR.INIT bit, the transceiver enters normal mode, where it
> affects the CAN bus (i.e. it ACKs frames). This can cause troubles when
> the m_can node is only used for monitoring the bus, as one cannot setup
> listen-only mode before the device is probed.
> 
> Rework the probe flow, so that the CCCR.INIT bit is only cleared when
> upping the device. First, the tcan4x5x driver is changed to stay in
> standby mode during/after probe. This in turn requires changes when
> setting bits in the CCCR register, as its CSR and CSA bits are always
> high in standby mode.
> 
> Signed-off-by: Martin Hundebøll <martin@...nix.com>

Applied to linux-can-next.

Thanks,
Marc

-- 
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