linux-kernel - Re: [PATCH] usb: xhci: tegra: Add shutdown callback for Tegra XUSB

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Date:   Tue, 18 Jul 2023 09:35:14 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Haotien Hsu <haotienh@...dia.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        inux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Wayne Chang <waynec@...dia.com>,
        JC Kuo <jckuo@...dia.com>, WK Tsai <wtsai@...dia.com>,
        Henry Lin <henryl@...dia.com>
Subject: Re: [PATCH] usb: xhci: tegra: Add shutdown callback for Tegra XUSB

On Tue, Jul 18, 2023 at 03:20:57PM +0800, Haotien Hsu wrote:
> From: Henry Lin <henryl@...dia.com>
> 
> If memory accesses by the Tegra XUSB controller are translated through
> the SMMU (System MMU), the hardware may continue accessing memory even
> after the SMMU translations have been disabled during the shutdown
> process and this can in turn cause unpredictable crashes.
> Fix this by adding a shutdown implementation that ensures the hardware
> is turned off during system reboot or shutdown.
> 
> Signed-off-by: Henry Lin <henryl@...dia.com>
> Signed-off-by: Haotien Hsu <haotienh@...dia.com>
> ---
>  drivers/usb/host/xhci-tegra.c | 28 +++++++++++++++++++++-------
>  1 file changed, 21 insertions(+), 7 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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