Re: [PATCH RFC 1/1] ASoC: fsl_ssi: Make fifo watermark and maxburst settings device tree options
From: Caleb Crome <hidden>
Date: 2016-01-15 04:56:53
Also in:
alsa-devel, lkml
On Thu, Jan 14, 2016 at 6:45 PM, Nicolin Chen [off-list ref] wrote:
On Thu, Jan 14, 2016 at 01:26:24PM -0800, Caleb Crome wrote:quoted
As for optimal settings, I finally came to a setting of 4 for depth & maxburst, which will result in more DMA requests, but it's the only way that works at 48kHz for me. The default settings is 13 (15 - 2) for the ones of the 15 item fifo, which is a pretty dramatic difference. I just don't know if other chips will behave badly in that case.What's your final configuration for TFWM0 bits, 4?
Yes, a value of 4 for my use case: i.MX6 @ 768000 words/second (48khz * 16 channels). Also, works at 8kHz, 16kHz 32 kHz. A setting of 8 does not work reliably at 48kHz but does work at 8, 16 and 32. -caleb -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html