> From: Andy Shevchenko [mailto:[email protected]] > Sent: Monday, September 28, 2015 4:46 PM > To: yitian <[email protected]>; 'Andy Shevchenko' > <[email protected]>; 'Viresh Kumar' <[email protected]> > Cc: 'Viresh Kumar' <[email protected]>; 'Vinod Koul' > <[email protected]>; 'Dan Williams' <[email protected]>; > 'dmaengine' <[email protected]>; 'Linux Kernel Mailing List' > <[email protected]> > 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:[email protected]] > > > Sent: Monday, September 28, 2015 3:06 PM > > > To: Viresh Kumar <[email protected]> > > > Cc: yitian <[email protected]>; Viresh Kumar > > > <[email protected]>; Andy Shevchenko > > > <[email protected]>; Vinod Koul < > > > [email protected]>; > > > Dan Williams <[email protected]>; dmaengine > > > <[email protected]>; Linux Kernel Mailing List > > > <[email protected]> > > > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
