linux-kernel - Re: [PATCH 5/5] tty: serial: Add 8250-core based omap driver

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Date:	Wed, 13 Aug 2014 09:37:23 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 5/5] tty: serial: Add 8250-core based omap driver

* Sebastian Andrzej Siewior <bigeasy@...utronix.de> [140813 09:23]:
> On 07/21/2014 11:35 AM, Tony Lindgren wrote:
> 
> > Looks like the following is needed to avoid the error, no idea why..
> > But this is what we also do in omap-serial.c. It may be needed in
> > other places too?
> 
> Yes, there was a third one on shutdown.

OK
 
> > Also, no luck yet on runtime PM. If the console is enabled omap won't
> > idle, and if no serial console is enabled, it just hangs. Will try
> > to debug this part further, it may be also related to the above.
> 
> My beaglebone xm won't do idle:
> 
> | omap3_pm_off_mode_enable: Core OFF disabled due to errata i583
> 
> but it would if it could, right? That means that I can't test the wake
> via UART on this one?

Hmm OK yes that's disabled for some earlier ES revisions. I guess you
could comment out the limitations for PM_SDRC_WAKEUP_ERRATUM_i583
in both cpuidle34xx.c and pm34xx.c and see if off-idle is usable for
your tests :) It might be flakey but still usable for testing.
 
> So I will try to fix the tx-pm, fold patches and then prepare another
> batch.

OK great, let me know if you need more help.

> And I could verify that DMA works on that omap3 :)

OK

Regards,

Tony
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