Messages in this thread | | | From | "yitian" <> | Subject | RE: [PATCH 1/1] dmaengine: dw: resolve recursion lock when audio playback | Date | Mon, 28 Sep 2015 17:14:36 +0800 |
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> From: Andy Shevchenko [mailto:andriy.shevchenko@linux.intel.com] > Sent: Monday, September 28, 2015 4:46 PM > To: yitian <yitian.bu@tangramtek.com>; 'Andy Shevchenko' > <andy.shevchenko@gmail.com>; 'Viresh Kumar' <viresh.kumar@linaro.org> > Cc: 'Viresh Kumar' <vireshk@kernel.org>; 'Vinod Koul' > <vinod.koul@intel.com>; 'Dan Williams' <dan.j.williams@intel.com>; > 'dmaengine' <dmaengine@vger.kernel.org>; 'Linux Kernel Mailing List' > <linux-kernel@vger.kernel.org> > Subject: Re: [PATCH 1/1] dmaengine: dw: resolve recursion lock when > audio playback > > On Mon, 2015-09-28 at 15:23 +0800, yitian wrote: > > > > > > From: Andy Shevchenko [mailto:andy.shevchenko@gmail.com] > > > Sent: Monday, September 28, 2015 3:06 PM > > > To: Viresh Kumar <viresh.kumar@linaro.org> > > > Cc: yitian <yitian.bu@tangramtek.com>; Viresh Kumar > > > <vireshk@kernel.org>; Andy Shevchenko > > > <andriy.shevchenko@linux.intel.com>; Vinod Koul < > > > vinod.koul@intel.com>; > > > Dan Williams <dan.j.williams@intel.com>; dmaengine > > > <dmaengine@vger.kernel.org>; Linux Kernel Mailing List > > > <linux-kernel@vger.kernel.org> > > > Subject: Re: [PATCH 1/1] dmaengine: dw: resolve recursion > > > > I am not sure if this is a sane way of doing that, and we were > > > > scanning > > > > the descriptors for some valid reason.. > > > > > > Actually one of the patches in a pile sitting in my private repo is > > > also including similar change. In my case the reason is to support > > > cyclic transfers natively. > > > > > > > Yes, i am using DW DMAC to support cyclic transfer. > > Currently it is very easy to get recursion lock crash, but > > after this patch everything is fine on my device. > > What is an actual hardware you are running kernel on? > Hi Andy:
I am using a FPGA, with Cortex-A5 core, Designware I2S IP, Designware DMAC IP. What I was done is to run tinyplay and tinycap to test the playback and capture function on the FPGA. With my change, both of them are okay now. I didn't push the patch which added cyclic DMA support for dw DMAC because I didn't make it decent enough yet.
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