lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 18 Feb 2016 17:07:04 +0800 From: Peter Chen <hzpeterchen@...il.com> To: Heikki Krogerus <heikki.krogerus@...ux.intel.com> Cc: Felipe Balbi <balbi@...nel.org>, Oliver Neukum <oneukum@...e.com>, Felipe Balbi <balbif@...il.com>, Mathias Nyman <mathias.nyman@...ux.intel.com>, Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org Subject: Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface On Wed, Feb 17, 2016 at 04:28:16PM +0200, Heikki Krogerus wrote: > On Wed, Feb 17, 2016 at 03:36:46PM +0200, Felipe Balbi wrote: > > > > Hi, > > > > > IIRC mode and role negotiation goes via CC pins using the power delivery > > protocol. If I misunderstand anything, let me know. > > The data role swap with USB Type-C connectors is in no way tied to USB > Power Delivery. The USB Type-C spec defines that when USB PD is > available, DR_Swap USB PD function is used to swap the role, otherwise > emulated disconnect will do the trick. > I am interested in how you design role swap on the fly without USB PD. Do you follow the spec like USB OTG 3.0 RSP (Role Swap Protocol) or just echo the /sys to give up current role, and swap to another? -- Best Regards, Peter Chen
Powered by blists - more mailing lists