On Sat, Jun 25, 2016 at 07:59:22AM +0300, Alexander Shiyan wrote: > The i.MX51 datasheet says: > Chapter 56.1.2.4 I2S Mode > ... > When I2S modes are entered (I2S master (01) or I2S slave (10)), > the following settings are recommended: > ... > - TX Frame Rate should be 2 i.e. (STCCR[12:8] = 1) > - RX Frame Rate should be 2 i.e. (SRCCR[12:8] = 1) > > Chapter 56.3.3.12 SSI Transmit and Receive Clock Control Registers (STCCR & SRCCR) > ... > Bits 12-8 DC4-DC0 > Frame Rate Divider Control. These bits are used to control the divide ratio > for the programmable frame rate dividers. The divide ratio works on the word > clock. In Normal mode, this ratio determines the word transfer rate. > In Network mode, this ratio sets the number of words per frame. The divide > ratio ranges from 1 to 32 in Normal mode and from 2 to 32 in Network mode. > In Normal mode, a divide ratio of 1 (DC=00000) provides continuous periodic > data word transfer. A bit-length frame sync must be used in this case. > > Function fsl_ssi_hw_params() setup Normal mode for MONO output, > so with DC=0, SSI enters to continuous periodic data word transfer. > To fix this, setup DC for any I2S mode. The change looks fine and didn't show any problem when I tested it. But I am wondering what's the failed user case here so we need this patch to fix? (The mono playback works without this patch as well.) Thanks Nicolin _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
