linux-kernel - Re: [PATCH] usb: Enable LPM for USB 2.01+ full-speed devices

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Message-ID: <b201d47b7805afee4c9c4c4ba3e95372.squirrel@www.codeaurora.org>
Date:	Wed, 8 Apr 2015 11:24:00 -0000
From:	rtatiya@...eaurora.org
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	rtatiya@...eaurora.org, sarah.a.sharp@...ux.intel.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] usb: Enable LPM for USB 2.01+ full-speed devices

>>
>> USB 2.01+ full-speed devices can have extended descriptor as well
>> and can support LPM.
>
> Yes, they in theory can, but what happens if they are actually
> asked to do so? On how many devices have you tested this patch?
>

I have tested this on Qualcomm USB controller, LPM works. LPM works with
same controller with Microsoft Windows as well. I have looked through few
Broadcom/CSR controllers, but could not find one that had USB version >=
2.01.

Thanks,
Rupesh

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