[alsa-devel] iMX6UL EVK with kernel 4.6

[Fabio Estevam]

On Sat, Apr 30, 2016 at 8:18 AM, Petr Kulhavy <brain at jikos.cz> wrote:
> Hi,
>
> I'm trying to run the latest mainline kernel 4.6 on the iMX6UL EVK. The
> board mostly works and the only problem is audio.
> Even though the sound card is detected and the ALSA mixer can be controlled
> there is no MCLK coming out of the SAI2 interface.

Also, have you tried setting bit 20 (SAI2_MCLK_DIR) of register IOMUXC_GPR_GPR1?

You can set this bit in the bootloader for a quick test.