Re: [PATCH v2 2/3] i2c: imx: Check for I2SR_IAL after every byte
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: 2020-10-05 08:07:32
Also in:
linux-i2c, lkml, stable
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel