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Subject: Re: [PATCH v1] usb: xhci: tegra: Check padctrl interrupt presence in
 device tree
From:   Dmitry Osipenko <digetx@gmail.com>
To:     Thierry Reding <thierry.reding@gmail.com>
Cc:     Thierry Reding <treding@nvidia.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mathias Nyman <mathias.nyman@intel.com>,
        JC Kuo <jckuo@nvidia.com>, Nicolas Chauvet <kwizart@gmail.com>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-tegra@vger.kernel.org
References: <20211021115501.14932-1-digetx@gmail.com>
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Message-ID: <2c22dc0c-6709-907d-8296-712d77282f0e@gmail.com>
Date:   Tue, 26 Oct 2021 10:23:16 +0300
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21.10.2021 17:57, Dmitry Osipenko пишет:
> It might be wrong to disable device_may_wakeup() because it will change
> the system suspend-resume behaviour, i.e. you won't be able to resume by
> USB event, see [1].
> 
> [1]
> https://elixir.bootlin.com/linux/v5.15-rc6/source/drivers/usb/host/xhci-tegra.c#L1962
> 
> Although, I'm not sure whether this is a correct behaviour to start
> with. Previously, before the offending commit, device_wakeup was never
> enabled for tegra-xusb. Commit message doesn't explain why wakeup is now
> enabled unconditionally, wakeup checks aren't needed at all then. This
> makes no sense, please check it with JC Kuo.

I looked at it again and now see that disabling wakeup actually should
restore the old code behaviour properly because previously wakeup wasn't
ever enabled. Alright, I'll prepare v2.