linux-kernel - Re: [PATCH v5 00/11] serial: 8250: split LPSS to 8250

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Message-ID: <1464279069.2351.4.camel@nexus-software.ie>
Date:	Thu, 26 May 2016 17:11:09 +0100
From:	Bryan O'Donoghue <pure.logic@...us-software.ie>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Peter Hurley <peter@...leysoftware.com>,
	linux-serial@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	ismo.puustinen@...el.com,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCH v5 00/11] serial: 8250: split LPSS to 8250_lpss, enable
 DMA on Quark

On Tue, 2016-05-24 at 20:37 +0300, Andy Shevchenko wrote:
> Below results doesn't show DMA case (by the way, how did you disable
> DMA
> in 3.8.7?) for stock kernel.

The stock kernel on SPI flash for my early Gen1 is a non-DMA 8250
driver, so nothing needs to be done to that, it's basically just the
3.8.7 8250 in PIO mode.

> Anyway, I added preliminary support to change DMA mode run-time.
> Check
> my today topic/dw/qrk branch. It would be nice to see all 4 cases:
> DMA
> vs non-DMA on stock kernel (Yocto) and mine.

I'll have another look at your latest branch and run the same tests.

> 
> P.S. What is the point to test arbitrary tip branch?

Just tip-of-tree, we can benchmark against the 4.6 tag if you prefer.


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bod