linux-kernel - Re: [PATCH v2] usb: dwc3: core: Add shutdown callback for dwc3

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Message-ID: <161841614106.46595.10678714020668948865@swboyd.mtv.corp.google.com>
Date:   Wed, 14 Apr 2021 09:02:21 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Doug Anderson <dianders@...omium.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Manu Gautam <mgautam@...eaurora.org>,
        Sandeep Maheswaram <sanm@...eaurora.org>
Subject: Re: [PATCH v2] usb: dwc3: core: Add shutdown callback for dwc3

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).
> 
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> ---

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