From: Pavel Machek <pavel@ucw.cz>
To: Oliver Neukum <oneukum@suse.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Rajaram R <rajaram.officemail@gmail.com>,
Felipe Balbi <felipe.balbi@linux.intel.com>,
Mathias Nyman <mathias.nyman@linux.intel.com>,
Greg KH <gregkh@linuxfoundation.org>,
Guenter Roeck <linux@roeck-us.net>,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [RFC PATCHv2] usb: USB Type-C Connector Class
Date: Sun, 7 Aug 2016 23:37:10 +0200 [thread overview]
Message-ID: <20160807213710.GA27135@amd> (raw)
In-Reply-To: <1466590137.12516.5.camel@suse.com>
Hi!
> > With these boards, you will not see anything on the screen that is
> > attached to a Type-C connector until the OS has booted to the point
> > where it has negotiated the power contract and entered a mode.
> >
> > If the system has BIOS/FW/EC capable of negotiating the power contract
> > and enter a mode, but where we still are expected to take over the
> > whole TCPM in OS, I think the connection will be reset.
>
> Think about a DP over type C display with a USB PD power brick on a
> daisy chain.
> If the host needs more than 15W or more than 5V, a reset is suicide.
>
> And losing earlyprintk hurts a lot.
> This means we need USB PD statically in the kernel. And a kernel
> based policy that brings up all displays.
Yes please.
Of course, even that will hurt, because I guess that means printk()
after USB, and that means late in the boot process, but better late in
kernel than in initrd.
(And yes, N900 has display pretty late in the bootprocess, and yes, it
is very annoying.)
Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2016-08-07 21:37 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-19 12:44 [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus
2016-05-19 14:47 ` Oliver Neukum
2016-05-20 11:24 ` Heikki Krogerus
2016-05-20 13:37 ` Oliver Neukum
2016-05-21 5:51 ` Guenter Roeck
2016-05-21 6:43 ` Oliver Neukum
2016-05-22 15:54 ` Guenter Roeck
2016-05-23 5:34 ` Oliver Neukum
2016-05-23 13:27 ` Guenter Roeck
2016-05-23 13:58 ` Oliver Neukum
2016-05-23 14:43 ` Guenter Roeck
2016-05-23 15:55 ` Oliver Neukum
2016-05-23 16:52 ` Guenter Roeck
2016-05-24 10:08 ` Heikki Krogerus
2016-05-24 10:18 ` Oliver Neukum
2016-05-24 11:04 ` Heikki Krogerus
2016-05-19 14:48 ` Oliver Neukum
2016-05-19 15:43 ` Greg KH
2016-05-20 10:58 ` Heikki Krogerus
2016-05-19 17:53 ` Guenter Roeck
2016-05-20 10:47 ` Heikki Krogerus
2016-05-20 17:02 ` Guenter Roeck
2016-05-23 9:23 ` Heikki Krogerus
2016-05-20 14:19 ` Oliver Neukum
2016-05-23 9:57 ` Heikki Krogerus
2016-05-23 11:25 ` Oliver Neukum
2016-05-23 17:09 ` Guenter Roeck
2016-05-24 9:06 ` Oliver Neukum
2016-05-24 9:32 ` Heikki Krogerus
2016-05-24 12:51 ` Oliver Neukum
2016-05-25 11:28 ` Heikki Krogerus
2016-05-25 15:19 ` Guenter Roeck
2016-05-27 7:30 ` Heikki Krogerus
2016-05-24 13:42 ` Guenter Roeck
2016-05-25 11:30 ` Heikki Krogerus
2016-05-25 13:12 ` Guenter Roeck
2016-05-24 19:28 ` Guenter Roeck
2016-05-25 11:51 ` Heikki Krogerus
2016-05-25 13:21 ` Guenter Roeck
2016-05-25 14:04 ` Heikki Krogerus
2016-05-25 14:20 ` Oliver Neukum
2016-05-25 14:59 ` Guenter Roeck
2016-05-27 7:29 ` Heikki Krogerus
2016-05-25 18:35 ` [RFC PATCH] usb: typec: Various API updates and fixes Guenter Roeck
2016-05-27 7:55 ` Heikki Krogerus
2016-05-27 14:06 ` Guenter Roeck
2016-05-30 12:48 ` Heikki Krogerus
2016-05-30 13:19 ` [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus
2016-05-30 13:59 ` Oliver Neukum
2016-05-31 8:31 ` Heikki Krogerus
2016-05-31 8:48 ` Oliver Neukum
2016-05-31 12:09 ` Heikki Krogerus
2016-05-31 12:43 ` Heikki Krogerus
2016-05-31 17:20 ` Guenter Roeck
2016-06-01 8:23 ` Heikki Krogerus
2016-06-01 8:31 ` Oliver Neukum
2016-06-01 9:04 ` Oliver Neukum
2016-06-01 13:34 ` Guenter Roeck
2016-06-02 6:24 ` Oliver Neukum
2016-06-02 6:37 ` Guenter Roeck
2016-06-02 7:43 ` Oliver Neukum
2016-05-31 17:14 ` Guenter Roeck
2016-06-01 9:26 ` Oliver Neukum
2016-06-01 23:29 ` Guenter Roeck
2016-06-02 6:30 ` Oliver Neukum
2016-06-02 8:27 ` Heikki Krogerus
2016-06-02 10:18 ` Heikki Krogerus
2016-06-02 16:12 ` Guenter Roeck
2016-06-03 13:21 ` Heikki Krogerus
2016-06-03 13:51 ` Guenter Roeck
2016-06-03 15:17 ` Heikki Krogerus
2016-06-03 18:39 ` Guenter Roeck
2016-06-06 13:28 ` Heikki Krogerus
2016-06-06 13:35 ` Oliver Neukum
2016-06-07 8:23 ` Heikki Krogerus
2016-06-07 16:57 ` Guenter Roeck
2016-06-02 8:02 ` Heikki Krogerus
2016-06-03 20:20 ` Pavel Machek
2016-06-06 13:45 ` Heikki Krogerus
2016-06-06 14:41 ` Greg KH
2016-06-07 8:25 ` Heikki Krogerus
2016-06-06 16:02 ` Guenter Roeck
2016-06-10 14:34 ` [RFC PATCHv3] " Heikki Krogerus
2016-06-11 7:05 ` Oliver Neukum
2016-06-11 18:03 ` Guenter Roeck
2016-06-13 7:49 ` Heikki Krogerus
2016-06-13 7:48 ` Heikki Krogerus
2016-06-21 13:08 ` [RFC PATCHv2] " Oliver Neukum
2016-06-21 13:24 ` Guenter Roeck
2016-06-21 19:43 ` Oliver Neukum
2016-06-21 21:37 ` Guenter Roeck
2016-06-21 13:58 ` Heikki Krogerus
2016-06-21 20:43 ` Oliver Neukum
2016-06-22 9:31 ` Heikki Krogerus
2016-06-22 10:08 ` Oliver Neukum
2016-06-22 11:19 ` Heikki Krogerus
2016-08-07 21:37 ` Pavel Machek [this message]
2016-08-08 8:52 ` Oliver Neukum
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