linux-kernel - Re: [PATCH V7 2/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c

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Message-ID: <f70837e3-2289-5320-df2e-c5a09e03d1c1@codeaurora.org>
Date:   Wed, 30 Dec 2020 14:56:57 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     Roja Rani Yarubandi <rojay@...eaurora.org>, wsa@...nel.org
Cc:     swboyd@...omium.org, dianders@...omium.org,
        saiprakash.ranjan@...eaurora.org, gregkh@...uxfoundation.org,
        mka@...omium.org, msavaliy@....qualcomm.com, skakit@...eaurora.org,
        pyarlaga@...eaurora.org, rnayak@...eaurora.org, agross@...nel.org,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        sumit.semwal@...aro.org, linux-media@...r.kernel.org
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 <rojay@...eaurora.org>
Reviewed-by: Akash Asthana <akashast@...eaurora.org>

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