linux-kernel - Re: [PATCH V11 1/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c

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Message-ID: <CAE-0n50LiQWZSgHZaPL4xq2Bf-EFTb9U7YJ6Ey3Tja1099ij6g@mail.gmail.com>
Date:   Tue, 25 May 2021 17:34:41 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     Roja Rani Yarubandi <rojay@...eaurora.org>, wsa@...nel.org
Cc:     dianders@...omium.org, saiprakash.ranjan@...eaurora.org,
        gregkh@...uxfoundation.org, mka@...omium.org,
        skananth@...eaurora.org, msavaliy@....qualcomm.com,
        skakit@...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 V11 1/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c

Quoting Roja Rani Yarubandi (2021-05-25 06:10:50)
> 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 for i2c driver to suspend the bus
> 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: Stephen Boyd <swboyd@...omium.org>