linux-kernel - Re: [PATCH v4 1/2] can: m_can: set init flag earlier in probe

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Message-ID: <20241210-rational-abiding-guppy-0160a3-mkl@pengutronix.de>
Date: Tue, 10 Dec 2024 15:37:19 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Matthias Schiffer <matthias.schiffer@...tq-group.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>, Martin Hundebøll <martin@...nix.com>, 
	Markus Schneider-Pargmann <msp@...libre.com>, "Felipe Balbi (Intel)" <balbi@...nel.org>, 
	Raymond Tan <raymond.tan@...el.com>, Jarkko Nikula <jarkko.nikula@...ux.intel.com>, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux@...tq-group.com
Subject: Re: [PATCH v4 1/2] can: m_can: set init flag earlier in probe

On 07.10.2024 10:23:58, Matthias Schiffer wrote:
> While an m_can controller usually already has the init flag from a
> hardware reset, no such reset happens on the integrated m_can_pci of the
> Intel Elkhart Lake. If the CAN controller is found in an active state,
> m_can_dev_setup() would fail because m_can_niso_supported() calls
> m_can_cccr_update_bits(), which refuses to modify any other configuration
> bits when CCCR_INIT is not set.
> 
> To avoid this issue, set CCCR_INIT before attempting to modify any other
> configuration flags.
> 
> Fixes: cd5a46ce6fa6 ("can: m_can: don't enable transceiver when probing")
> Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> Reviewed-by: Markus Schneider-Pargmann <msp@...libre.com>

Applied to linux-can.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
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