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Date:   Wed, 30 Dec 2020 14:56:57 +0530
From:   Akash Asthana <>
To:     Roja Rani Yarubandi <>,
Subject: Re: [PATCH V7 2/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c

On 12/21/2020 6:08 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 <>
Reviewed-by: Akash Asthana <>

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