linux-kernel - Re: [PATCH v3 6/8] usb: dwc2: host: Assume all devices are on one single

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Message-ID: <CAD=FV=UiGNb=aysw2NGPH-bOkCFvXcovNZOWzUdzR4t4AmVD-A@mail.gmail.com>
Date:	Tue, 17 Nov 2015 13:22:55 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	John Youn <John.Youn@...opsys.com>, Felipe Balbi <balbi@...com>
Cc:	Yunzhi Li <lyz@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Julius Werner <jwerner@...omium.org>,
	"Herrero, Gregory" <gregory.herrero@...el.com>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Ming Lei <ming.lei@...onical.com>,
	Douglas Anderson <dianders@...omium.org>,
	John Youn <johnyoun@...opsys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6/8] usb: dwc2: host: Assume all devices are on one
 single_tt hub

Hi,

On Mon, Nov 16, 2015 at 4:51 PM, Douglas Anderson <dianders@...omium.org> wrote:
> Until we have logic to determine which devices share the same TT let's
> add logic to assume that all devices on a given dwc2 controller are on
> one single_tt hub.  This is better than the previous code that assumed
> that all devices were on one multi_tt hub, since single_tt hubs
> appear (in my experience) to be much more common and any schedule that
> would work on a single_tt hub will also work on a multi_tt hub.  This
> will prevent more than 8 total low/full speed devices to be on the bus
> at one time, but that's a reasonable restriction until we've made things
> smarter.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> Changes in v3:
> - Assuming single_tt is new for v3; not terribly well tested (yet).
>
> Changes in v2: None
>
>  drivers/usb/dwc2/core.h      |  1 +
>  drivers/usb/dwc2/hcd_queue.c | 40 +++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 40 insertions(+), 1 deletion(-)

Just as a FYI I managed to make this a little better with
<http://crosreview.com/312981>, but not posting that yet because
Julius has pointed out some things offline that I could be doing
better (actually schedule the low speed bus properly).  I'll hopefully
post something more soon...

-Doug
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