Re: [PATCH v2 2/3] i2c: imx: Check for I2SR_IAL after every byte

[Krzysztof Kozlowski]

On Fri, Oct 02, 2020 at 05:23:04PM +0200, Christian Eggers wrote:
> Arbitration Lost (IAL) can happen after every single byte transfer. If
> arbitration is lost, the I2C hardware will autonomously switch from
> master mode to slave. If a transfer is not aborted in this state,
> consecutive transfers will not be executed by the hardware and will
> timeout.
> 
> Signed-off-by: Christian Eggers <ceggers@xxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
>  drivers/i2c/busses/i2c-imx.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 

Tested (not extensively) on Vybrid VF500 (Toradex VF50):
Tested-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>

The I2C on Vybrid VF500 still works fine. I did not test this actual
condition (arbitration) but only a regular I2C driver (BQ27xxx fuel
gauge). Obviously this only proves that regular operation is not
broken...

Alternatively if you have a specific testing procedure (reproduction of
a problem), please share.

Best regards,
Krzysztof