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

[Fabio Estevam]

Hi Stefan,

On Mon, Aug 19, 2024 at 4:20 AM Stefan Eichenberger <eichest at gmail.com> wrote:
>
> From: Stefan Eichenberger <stefan.eichenberger at toradex.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 at toradex.com>
> Reviewed-by: Frank Li <Frank.Li at nxp.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 at denx.de>

Thanks a lot,

Fabio Estevam