linux-kernel - Re: [PATCH 3/3] serial: 8250: omap: restore registers on shutdown

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Date:	Fri, 7 Aug 2015 12:41:51 +1200
From:	Charles Manning <cdhmanning@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Ogness <john.ogness@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
	nsekhar@...com, nm@...com, linux-serial@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH 3/3] serial: 8250: omap: restore registers on shutdown

On Fri, Aug 7, 2015 at 6:22 AM, Peter Hurley <peter@...leysoftware.com> wrote:
> I agree; this is what we should do first because someone might want it
> for backports.

Got an idea how far this can be ported back?

I'm being hampered by severe performance issues on a
beagleboneblack-like device (am335x) running on 3.18 kernel.

I have a 1Mbaud link that is getting packets of about 22 bytes @800 Hz
and old omap-serial is keeping up, but killing the CPU.

I'm considering backporting 8250_omap as a get out of jail.

Opinions appreciated.

Thanks.
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