From: Mike Frysinger <vapier@gentoo.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] usb: increase delay after port reset
Date: Wed, 9 Nov 2011 20:09:02 -0500 [thread overview]
Message-ID: <201111092009.03751.vapier@gentoo.org> (raw)
In-Reply-To: <1320883438-12274-1-git-send-email-yanok@emcraft.com>
On Wednesday 09 November 2011 19:03:58 Ilya Yanok wrote:
> In our setup (OMAP3 EHCI host, keyboard, mouse mass storage and BT
> dongle devices connected via several hubs) keyboard fails to initialize
> during the bus scan (stalled endpoint while get_descriptor/64) and after
> that keyboard is unusable (even in Linux) until power off/on.
>
> Increasing the delay after port reset from 200ms to 260ms solves this
> problem.
ugh. this doesn't sound like the right way to fix things. looks like Linux
has added a dynamic polling state that automatically deals with broken
devices. look at its hub_port_debounce. seems like we should implement
something like that instead of delaying longer and longer and making the
situation needlessly worse for most systems.
-mike
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next prev parent reply other threads:[~2011-11-10 1:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-10 0:03 [U-Boot] [PATCH] usb: increase delay after port reset Ilya Yanok
2011-11-10 1:09 ` Mike Frysinger [this message]
2011-11-16 21:17 ` Ilya Yanok
2012-04-02 17:29 ` Marek Vasut
2012-04-02 19:00 ` Ilya Yanok
2012-04-03 15:19 ` Stefano Babic
2012-04-03 16:16 ` Marek Vasut
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