From: gregory.clement@free-electrons•com (Gregory CLEMENT)
To: linux-arm-kernel@lists•infradead.org
Subject: MUSB dual-role on AM335x behaving weirdly
Date: Tue, 04 Aug 2015 15:08:36 +0200 [thread overview]
Message-ID: <55C0B954.3020106@free-electrons.com> (raw)
In-Reply-To: <CADYTM3ZF5m++N1NqmOJoH5agbYrzpvSbLnuLVgttxwzdzwmGwQ@mail.gmail.com>
Hi Bin,
On 02/07/2015 19:05, Bin Liu wrote:
> Hi,
>
> On Thu, Jul 2, 2015 at 2:16 AM, Gregory CLEMENT
> <gregory.clement@free-electrons•com> wrote:
>> Hi Felipe,
>>
>> On 27/05/2015 11:42, Alexandre Belloni wrote:
>>> Hi,
>>>
>>> On 26/05/2015 at 09:51:18 -0500, Felipe Balbi wrote :
>>>> On Thu, May 14, 2015 at 04:36:33PM -0500, Bin Liu wrote:
>>>>> Alexandre,
>>>>>
>>>>> On Thu, May 14, 2015 at 4:26 PM, Alexandre Belloni
>>>>> <alexandre.belloni@free-electrons•com> wrote:
>>>>>> 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.
>>>>>
>>>>> Have you measured the VBUS discharging? Is there any way to share your
>>>>> schematics?
>>>>
>>>> Alexandre, any further comments ?
>>>>
>>>
>>> Yeah, I have just got more info.
>>>
>>> This is the relevant part of the schematic:
>>> http://free-electrons.com/~alexandre/usb.png
>>>
>>> The total VBUS capacitance is 200nF and the USB0 pins are connected
>>> directly to the AM3358 pins. U1 is actually not fitted.
>>>
>>> We didn't measure VBUS discharging but we observe the OTG pin sensing
>>> stops when plugging an OTG cable without any device.
>>
>> Do you have any news about this topic?
>>
>>
>> Is there something else that we can do to help solving this issue?
>
> In the case of CONFIG_USB_MUSB_DUAL_ROLE=y and dr_mode=otg, how is the
> gadget driver configured? It has to be a module not built-in.
Indeed when I configured CONFIG_USB_MUSB_HDRC=m and CONFIG_USB_MUSB_DSPS=m
it worked seamless.
Thanks,
Gregory
>
> Regards,
> -Bin.
>
>>
>>
>> Thanks,
>>
>> Gregory
>>
>>
>> --
>> Gregory Clement, Free Electrons
>> Kernel, drivers, real-time and embedded Linux
>> development, consulting, training and support.
>> http://free-electrons.com
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
next prev parent reply other threads:[~2015-08-04 13:08 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
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 [this message]
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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