From mboxrd@z Thu Jan 1 00:00:00 1970 From: balbi@ti.com (Felipe Balbi) Date: Tue, 26 May 2015 09:51:18 -0500 Subject: MUSB dual-role on AM335x behaving weirdly In-Reply-To: References: <20150514174907.GQ24269@saruman.tx.rr.com> <20150514190429.GT24269@saruman.tx.rr.com> <20150514192125.GU24269@saruman.tx.rr.com> <20150514192946.GV24269@saruman.tx.rr.com> <20150514212653.GC3338@piout.net> Message-ID: <20150526145118.GD26599@saruman.tx.rr.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > 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 ? -- balbi -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: