From: Wolfram Sang <wsa@kernel.org>
To: Roja Rani Yarubandi <rojay@codeaurora.org>
Cc: swboyd@chromium.org, dianders@chromium.org,
saiprakash.ranjan@codeaurora.org, gregkh@linuxfoundation.org,
mka@chromium.org, skananth@codeaurora.org,
msavaliy@qti.qualcomm.com, skakit@codeaurora.org,
rnayak@codeaurora.org, agross@kernel.org,
bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
sumit.semwal@linaro.org, linux-media@vger.kernel.org
Subject: Re: [PATCH V11 1/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c
Date: Fri, 28 May 2021 10:11:23 +0200 [thread overview]
Message-ID: <YLClq6hZKUA1Y4ZW@kunai> (raw)
In-Reply-To: <20210525131051.31250-2-rojay@codeaurora.org>
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On Tue, May 25, 2021 at 06:40:50PM +0530, 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 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@codeaurora.org>
Do we need patch 1 after patch 2 was applied? I always thought all
devices are suspended before shutdown/reboot?
Nice to see that 'mark_adapter_suspended' becomes useful again!
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next prev parent reply other threads:[~2021-05-28 8:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 13:10 [PATCH V11 0/2] Implement Shutdown callback for geni_i2c Roja Rani Yarubandi
2021-05-25 13:10 ` [PATCH V11 1/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c Roja Rani Yarubandi
2021-05-25 21:34 ` Stephen Boyd
2021-05-28 8:11 ` Wolfram Sang [this message]
2021-05-31 5:24 ` rojay
2021-06-02 5:07 ` rojay
2021-06-04 20:33 ` Wolfram Sang
2021-05-25 13:10 ` [PATCH V11 2/2] i2c: i2c-qcom-geni: Suspend and resume the bus during SYSTEM_SLEEP_PM ops Roja Rani Yarubandi
2021-05-25 21:36 ` Stephen Boyd
2021-06-04 20:34 ` Wolfram Sang
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