linux-kernel - Re: [PATCH v2 1/4] i2c: imx: only poll for bus busy in multi master mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAOMZO5CYUNESmBdZBMSMwNraQbqvvsF5fn8i+nHr=MB_T_AG7w@mail.gmail.com>
Date: Wed, 21 Aug 2024 08:01:20 -0300
From: Fabio Estevam <festevam@...il.com>
To: Stefan Eichenberger <eichest@...il.com>
Cc: o.rempel@...gutronix.de, kernel@...gutronix.de, andi.shyti@...nel.org, 
	shawnguo@...nel.org, s.hauer@...gutronix.de, Frank.Li@....com, 
	francesco.dolcini@...adex.com, linux-i2c@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Stefan Eichenberger <stefan.eichenberger@...adex.com>
Subject: Re: [PATCH v2 1/4] i2c: imx: only poll for bus busy in multi master mode

Hi Stefan,

On Mon, Aug 19, 2024 at 4:20 AM Stefan Eichenberger <eichest@...il.com> wrote:
>
> From: Stefan Eichenberger <stefan.eichenberger@...adex.com>
>
> According to the i.MX8M Mini reference manual chapter "16.1.4.2
> Generation of Start" it is only necessary to poll for bus busy and
> arbitration lost in multi master mode. This helps to avoid rescheduling
> while the i2c bus is busy and avoids SMBus devices to timeout.
>
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@...adex.com>
> Reviewed-by: Frank Li <Frank.Li@....com>

This fixes a pca953x probe error on an imx8mp board running linux-stable 6.6:

[    1.893260] pca953x 2-0020: failed writing register
[    1.898258] pca953x 2-0020: probe with driver pca953x failed with error -11

Could you please add a Fixes tag and Cc stable so that this can reach
the stable kernels?

Tested-by: Fabio Estevam <festevam@...x.de>

Thanks a lot,

Fabio Estevam