Re: [linux-sunxi] [PATCH 0/2] ASoC: Add support for the Allwinner A10 codec

From: Hans de Goede
Date: Tue Sep 29 2015 - 17:14:13 EST


On 09/28/2015 09:42 AM, Maxime Ripard wrote:
Hi Priit,

On Tue, Sep 22, 2015 at 04:26:57PM +0300, Priit Laes wrote:
On Sat, 2015-09-12 at 15:26 +0200, Maxime Ripard wrote:
Hi everyone,

This patch set adds the support for what Allwinner calls the codec on
their SoCs.

This codec is actually a combination of a codec and DAI, tied
in a single memory-mapped IP. It is completely standalone, and
directly the analog signal.

While it supports both playback and capture, the capture is not
implemented in this patch, and will be posted eventually as a

This set, in order to be functional, has a dependency on the audio
clocks patch set posted separately. However, it doesn't needs this to
compile properly, so I guess it can be merged without really caring
for the merging status of the clock patches.

It works on Gemei G9 tablet which has also extra chip that
automatically switches output over from internal speakers to headphones
when connector is inserted.

Now I noticed some weird things:

When I have all the switches as ON in alsamixer, and I start disabling
them, I get following weird results.

Left Mixer Left - LML
Right Mixer Left - LMR
Right Mixer Right - RMR

Very faint output:
RML - Mute

Output works fully:
LML - Mute
RML - Mute
RMR - Mute

When I Mute Pre-Amplifier and fiddle any of LML, RML or RMR, the output
stays mute even after setting Pre-Amplifier Mute back on:

1. All switches on
2. Mute pre-amplifier
3. Mute RMR
4. Pre-Amilifier Mute Off
.. Music stays off
5. Toggle Pre-Amplifier twice - output turns on

Unfortunately, I don't have access to that SoC or that setup.

I'm seeing similar stuff on a cubieboard, both A10 and A20
based cubieboards, I have to fiddle a bit with the switches
to get things to work. At boot all switches are disabled.

On both A10 and A20 I need to enable to following for things to work:

unmute Pre-Amplifier DAC
unmute Pre-Amplifier Mute

I guess this is just a question if adding some mixer defaults to
the alsa userspace somewhere ?


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