From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bryan O'Donoghue Subject: Re: [PATCH v5 00/11] serial: 8250: split LPSS to 8250_lpss, enable DMA on Quark Date: Thu, 26 May 2016 17:11:09 +0100 Message-ID: <1464279069.2351.4.camel@nexus-software.ie> References: <1462547840-14091-1-git-send-email-andriy.shevchenko@linux.intel.com> <1463065601.17131.319.camel@linux.intel.com> <1463620733.4224.75.camel@nexus-software.ie> <1464111448.31269.67.camel@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1464111448.31269.67.camel@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Andy Shevchenko , Peter Hurley , linux-serial@vger.kernel.org, Vinod Koul , linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, Greg Kroah-Hartman , ismo.puustinen@intel.com, Heikki Krogerus List-Id: linux-serial@vger.kernel.org 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. --- bod