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Subject: Re: [PATCH v2] usb: dwc3: core: Add shutdown callback for dwc3
From:   Stephen Boyd <swboyd@chromium.org>
Cc:     linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, Manu Gautam <mgautam@codeaurora.org>,
        Sandeep Maheswaram <sanm@codeaurora.org>
To:     Doug Anderson <dianders@chromium.org>,
        Felipe Balbi <balbi@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Matthias Kaehlcke <mka@chromium.org>,
        Sandeep Maheswaram <sanm@codeaurora.org>
Date:   Wed, 14 Apr 2021 09:02:21 -0700
Message-ID: <161841614106.46595.10678714020668948865@swboyd.mtv.corp.google.com>
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Quoting Sandeep Maheswaram (2021-04-13 23:03:29)
> This patch adds a shutdown callback to USB DWC core driver to ensure that
> it is properly shutdown in reboot/shutdown path. This is required
> where SMMU address translation is enabled like on SC7180
> SoC and few others. If the hardware is still accessing memory after
> SMMU translation is disabled as part of SMMU shutdown callback in
> system reboot or shutdown path, then IOVAs(I/O virtual address)
> which it was using will go on the bus as the physical addresses which
> might result in unknown crashes (NoC/interconnect errors).
>=20
> Signed-off-by: Sandeep Maheswaram <sanm@codeaurora.org>
> ---

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