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

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Date:   Wed, 14 Apr 2021 11:12:02 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Sandeep Maheswaram <sanm@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.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

Sandeep Maheswaram <sanm@...eaurora.org> writes:

> 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>

Acked-by: Felipe Balbi <balbi@...nel.org>

-- 
balbi

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