tree 7de39a0ee069ef70eef6a52603134435597ccc74
parent e5c02cf541541605f704fbbb9a764e23f88ad0cb
author Roja Rani Yarubandi <rojay@codeaurora.org> 1610118345 +0530
committer Wolfram Sang <wsa@kernel.org> 1612217374 +0100

i2c: i2c-qcom-geni: Add shutdown callback for i2c

If the hardware is still accessing memory after SMMU translation
is disabled (as part of smmu shutdown callback), then the
IOVAs (I/O virtual address) which it was using will go on the bus
as the physical addresses which will result in unknown crashes
like NoC/interconnect errors.

So, implement shutdown callback to i2c driver to stop on-going transfer
and unmap DMA mappings during system "reboot" or "shutdown".

Fixes: 37692de5d523 ("i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller")
Signed-off-by: Roja Rani Yarubandi <rojay@codeaurora.org>
Reviewed-by: Akash Asthana <akashast@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>