Date: Mon, 28 Sep 2009 16:55:44 +0300 From: Andriy Gapon <avg@freebsd.org> To: John Baldwin <john@baldwin.cx> Cc: freebsd-current@freebsd.org, freebsd-usb@freebsd.org, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: sb600/sb700 ohci experimental patch Message-ID: <4AC0C060.20109@freebsd.org> In-Reply-To: <200909280748.45528.john@baldwin.cx> References: <4ABA36B1.9070706@icyb.net.ua> <4ABF57F5.1050106@icyb.net.ua> <4ABF643D.1080705@freebsd.org> <200909280748.45528.john@baldwin.cx>
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on 28/09/2009 14:48 John Baldwin said the following: > I don't think you can do this because it is a "feature" to not disable SMM if > ohci(4) is not loaded so that a USB keyboard works when the USB driver isn't > loaded via PS/2 emulation, even when the OS is running. Very good point. > I am curious if we > really need to do the handover for each controller or if disabling it for > ohci0 effectively disables it for all controllers? What do other OS's do? > Don't have an answer about other OSes. But OHCI controllers have individual "used by SMM" bits and taking over one controller doesn't affect the bits of the other controllers - they remain set. Not that it means that SMM code actually keeps on controlling them. Actually, just checked - Linux also does it per controller: http://lxr.linux.no/#linux+v2.6.31/drivers/usb/host/ohci-hcd.c#L495 -- Andriy Gapon
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