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@arri.de Cc: stable@vger.kernel.org
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@kernel.org
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