Re: [PATCH v4 2/3] i2c: qcom-geni: Add bus recovery support for FIFO mode

[Mukesh Savaliya <mukesh.savaliya@oss.qualcomm.com>]

On 11/3/2026 2:26 PM, Aniket Randive wrote:
> I2C transfers in FIFO mode can fail with -EPROTO, -ETIMEDOUT or
> -EAGAIN when a target holds SDA low, leaving the bus stuck and
> preventing subsequent transactions.
> 
> Add bus recovery support using the I2C_BUS_CLEAR and I2C_STOP_ON_BUS
> hardware opcodes to restore the bus to an idle state. Check the SDA
> line state through SE_GENI_IOS.RX_DATA_IN and skip recovery when the
> bus is already free. Trigger recovery automatically from
> geni_i2c_xfer() on -EPROTO, -ETIMEDOUT and -EAGAIN (arbitration-lost)
> errors, and register the recovery callback through i2c_bus_recovery_info
> to allow recovery via i2c_recover_bus().
> 
> Use the adapter timeout for recovery commands. Configure the serial clock
> and bus timing after runtime resume so direct calls to i2c_recover_bus()
> do not depend on an earlier transfer having configured them.
> 
> This adds bus recovery support for FIFO mode only.
> 
> Signed-off-by: Aniket Randive <aniket.randive@oss.qualcomm.com>
> ---
Reviewed-by: Mukesh Kumar Savaliya <mukesh.savaliya@oss.qualcomm.com>