Re: [PATCH V8 1/1] i2c: i2c-qcom-geni: Add shutdown callback for i2c
From: Akash Asthana <hidden>
Date: 2021-01-12 07:32:12
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On 1/8/2021 8:35 PM, Roja Rani Yarubandi wrote:
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 <redacted>Reviewed-by: Akash Asthana <redacted> -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project