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From: Stephen Boyd <swboyd@chromium.org>
To: Roja Rani Yarubandi <rojay@codeaurora.org>, wsa@kernel.org
Cc: 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: Tue, 25 May 2021 17:34:41 -0400	[thread overview]
Message-ID: <CAE-0n50LiQWZSgHZaPL4xq2Bf-EFTb9U7YJ6Ey3Tja1099ij6g@mail.gmail.com> (raw)
In-Reply-To: <20210525131051.31250-2-rojay@codeaurora.org>

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@codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>

  reply	other threads:[~2021-05-25 21:34 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 [this message]
2021-05-28  8:11   ` Wolfram Sang
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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