Re: [PATCH v5 00/11] serial: 8250: split LPSS to 8250_lpss, enable DMA on Quark

From: Bryan O'Donoghue
Date: Thu May 26 2016 - 12:11:25 EST

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
> 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:
> 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.