[alsa-devel] [PATCH v4 2/5] ASoC: Move standard kcontrol helpers to the component level

[Shawn Guo]

On Sat, May 10, 2014 at 09:11:04AM +0200, Lars-Peter Clausen wrote:
> On 05/10/2014 09:04 AM, Lars-Peter Clausen wrote:
> [..]
> >>The error message only shows up with Debian wheezy and does not with
> >>yocto rootfs.  And even when the error message shows, the audio still
> >>functions well on Debian wheezy.  So it's just a noisy error message
> >>for me which is only seen after your kernel patch.
> >
> >The keyword here is "seen". The error quite likely predated the commit, but
> >it was silently discarded.
> >
> >regmap_read() returns -EBUSY when there is no cached register value and
> >cache_only is set to true. But I'm not sure why that would happen, try to
> >add some printks to _regmap_read() to see if this is the source and if it is
> >why it is.
> 
> Both SGTL5000_CHIP_ANA_ADC_CTRL and SGTL5000_CHIP_MIC_CTRL don't
> have an entry in sgtl5000_reg_defaults. So if cache_only is true,
> controls which use these registers will return -EBUSY when you try
> to read or write them.

Hmm, it's a wm8962 than sgtl5000 on board imx6q-sabresd.

Shawn