From: alexandre.belloni@free-electrons•com (Alexandre Belloni)
To: linux-arm-kernel@lists•infradead.org
Subject: MUSB dual-role on AM335x behaving weirdly
Date: Thu, 14 May 2015 23:26:53 +0200 [thread overview]
Message-ID: <20150514212653.GC3338@piout.net> (raw)
In-Reply-To: <CADYTM3a1QWnec1D=wT=fgZ-RCXAx_qZYYoFg5gWOy0yT4vovHA@mail.gmail.com>
On 14/05/2015 at 16:16:12 -0500, Bin Liu wrote :
> I think I found the root cause of the problem: board design issue - I
> bet the custom board has too much cap on VBUS line. It should be <
> 10uF.
>
We have a custom board that exhibits the issue but it only has a 100nF
cap on VBUS.
> I just noticed I have the Jumper 36 on on my EVM, which adds 154.7uF
> cap on VBUS causing discharge takes ~20sec. After removed the jumper,
> which leaves only 4.7uF cap on VBUS, now it only takes ~0.4sec to
> generate Disconnect IRQ. Here is the log.
>
> root@:~# [ 2504.893123] musb-hdrc musb-hdrc.0.auto: usbintr (1) epintr(0)
> [ 2504.899198] musb-hdrc musb-hdrc.0.auto: <== DevCtl=99, int_usb=0x1
> [ 2504.912751] zero gadget: suspend
> [ 2504.916145] zero gadget: zero_suspend
> [ 2505.303937] musb-hdrc musb-hdrc.0.auto: usbintr (20) epintr(0)
> [ 2505.310072] musb-hdrc musb-hdrc.0.auto: <== DevCtl=88, int_usb=0x20
> [ 2505.325355] zero gadget: reset config
> [ 2507.303288] musb-hdrc musb-hdrc.0.auto: Poll devctl 80 (b_idle)
>
--
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
next prev parent reply other threads:[~2015-05-14 21:26 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-21 16:06 MUSB dual-role on AM335x behaving weirdly Maxime Ripard
2015-01-21 18:53 ` Bin Liu
2015-01-22 7:37 ` Yegor Yefremov
2015-01-22 10:43 ` Maxime Ripard
2015-01-22 11:01 ` Markus Pargmann
2015-01-22 14:00 ` Maxime Ripard
2015-01-22 14:52 ` Bin Liu
2015-02-05 13:21 ` Maxime Ripard
2015-02-24 10:39 ` Maxime Ripard
2015-02-24 14:54 ` Felipe Balbi
2015-02-24 16:50 ` Maxime Ripard
2015-02-24 17:33 ` Felipe Balbi
2015-02-25 11:11 ` Maxime Ripard
2015-02-25 12:11 ` Yegor Yefremov
2015-05-14 17:07 ` Felipe Balbi
2015-05-14 17:40 ` Felipe Balbi
2015-05-14 17:49 ` Felipe Balbi
2015-05-14 19:04 ` Felipe Balbi
2015-05-14 19:19 ` Bin Liu
2015-05-14 19:21 ` Felipe Balbi
2015-05-14 19:29 ` Bin Liu
2015-05-14 19:29 ` Felipe Balbi
2015-05-14 19:49 ` Felipe Balbi
2015-05-14 20:03 ` Bin Liu
2015-05-14 20:10 ` Felipe Balbi
2015-05-14 21:04 ` Bin Liu
2015-05-14 21:16 ` Bin Liu
2015-05-14 21:26 ` Alexandre Belloni [this message]
2015-05-14 21:36 ` Bin Liu
2015-05-26 14:51 ` Felipe Balbi
2015-05-27 9:42 ` Alexandre Belloni
2015-07-02 7:16 ` Gregory CLEMENT
2015-07-02 17:05 ` Bin Liu
2015-08-04 13:08 ` Gregory CLEMENT
2015-08-04 14:23 ` Gregory CLEMENT
2015-08-04 19:32 ` Felipe Balbi
2015-08-18 12:36 ` Gregory CLEMENT
2015-08-18 14:13 ` Felipe Balbi
2015-08-20 16:35 ` Gregory CLEMENT
2015-08-20 16:46 ` Felipe Balbi
2015-08-21 12:19 ` Gregory CLEMENT
2015-04-14 15:46 ` Maxime Ripard
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