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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > -----Original Message----- > From: Benjamin Herrenschmidt > Sent: Tuesday, December 14, 2021 10:36 AM > To: Neal Liu ; Felipe Balbi ; > Greg Kroah-Hartman ; Joel Stanley > ; Andrew Jeffery ; Cai Huoqing > ; Tao Ren ; Julia Lawall > ; kernel test robot ; Sasha Levin > ; linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; linux-aspeed@lists.ozlabs.org > Cc: BMC-SW > Subject: Re: [PATCH v3 2/4] usb: aspeed-vhub: fix remote wakeup failure in > iKVM use case > > On Thu, 2021-12-09 at 02:37 +0000, Neal Liu wrote: > > I'm confused. Signaling Wakeup when wakeup_en is set if it has any ep > > activities is not exactly what you said? > > > > wakeup_en is set only if host allows this device have wakeup > > capability and bus being suspended. > > > > Normal ep activities would not write the MMIO because wakeup_en is not > > set. > > Hrm... I didn't think wakeup_en was limited to the bus being suspended, but > maybe I misremember, it's been a while. > > Cheers, > Ben. > wakeup_en is only set in the case of host set USB_DEVICE_REMOTE_WAKEUP feature to vhub devices. I think this behavior only occurs during host is going to suspend, and set this feature to any device which can wakeup itself before sleep. Thanks -Neal _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel