On Tue, Apr 4, 2017 at 8:38 AM, Fabio Estevam festevam@gmail.com wrote:
I have the following SSI1 values (with the original 4.1-rc5 + pictrl patch):
# cat /sys/kernel/debug/regmap/2028000.ssi/registers 00: 00000200 04: 00000000 10: 0000105b
Bits 6-5 (I2S_MODE) of register SCR are 10 of register SCR, which means I2S slave mode.
The MX6 Reference Manual states:
"In I2S slave mode(SSI_SCR[6:5]=10), the following settings are internally overridden by the hardware:
Normal mode is selected (SSI_SCR[3]=0) Tx frame sync length set to one-bit-long-frame (SSI_STCR[1]=1) Rx frame sync length set to one-bit-long-frame (SSI_SRCR[1]=1)"
so I tried not to use the the one-bit-long-frame (since ENGcm06222 is about bit length frame sync) override and changed it to I2S normal mode instead:
--- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -973,7 +973,7 @@ static int _fsl_ssi_set_dai_fmt(struct device *dev, ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_MASTER; break; case SND_SOC_DAIFMT_CBM_CFM: - ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_SLAVE; + ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_NORMAL; break; default: return -EINVAL;
and I do not get the channel swap anymore.
In what cases could we safely switch to I2S normal mode?
Thanks