[PATCH 00/14] ASoc: sunxi: Add Allwinner A33 codec driver

On Tue,  4 Oct 2016 11:46:13 +0200
Myl?ne Josserand [off-list ref] wrote:

Hi everyone,


This patchset add the audio codec for Allwinner A33 (sun8i) SoC.

It adds different drivers:
   - sun8i-codec-analog (patch 4): This driver implements the analog
part of the audio codec. The analog part is handled in PRCM registers
so this driver must be added as prcm's subnode (patch 5).
   - sun8i-codec (patch 6): This driver implements the digital part
of the A33 codec.
   - sun8i (patch 7): This driver implements a sound card for A33.
   It links the DAI and the audio codec. The analog codec driver is
handled as an "aux_device".

The DAI for this codec is the same than for A20: "sun4i-i2s".
The digital codec code is coming from Allwinner's BSP (after some
cleanup and DAPM conversion) [1]
The analog codec driver is coming from Chen-Yu Tsai's driver [2]
with some modifications (such as read/write regmap functions).

Currently, all the drivers handle only the playback feature.
The other ones (such as capture) and all other interfaces except
headphone are not supported.

These drivers are functional except for one issue. When playing a
sound for the first time, a short delay can be noticed. On a second
play (right after), the sound is played correctly. If we wait a short
time (~5 sec), the delay is back.
There is the same behavior for left/right channel. On the first
time, a left sound is played on the left channel but in the second
time, the sound will be played on wrong channel.

These issues will be fixed in a second time. Is someone have
suggestions about it?

Examples of amixer commands:
	amixer set 'Headphone' 75%
	amixer set 'Headphone' on
	amixer set 'DAC' on
	amixer set 'Right DAC Mixer RSlot 0' on
	amixer set 'Left DAC Mixer LSlot 0' on
	amixer set 'DAC Reversed Right' on
	amixer set 'DAC Reversed Left' on

It was tested on Parrot and Sinlinx board where device tree's
modifications are added (patch 11 to 14).

I tested it on my iNet D978 Rev2 board (dts available in linux-next now)
Directly output audio from mpg123 to the audio codec failed, with
noises appear in the earphone. (And the mpg123 process terminated very
fast, seems that the bitrate become wrong)

However, paplay works well with the decoded wav file, and ```mpg123 -o
pulse``` works properly.

Thank you in advance,
Best regards,

[1]:
https://github.com/allwinner-zh/linux-3.4-sunxi/blob/master/sound/soc/sunxi/audiocodec/sun8iw5_sndcodec.c
[2]: https://github.com/wens/linux/tree/a31-audio

Myl?ne Josserand (14):
  dma: sun6i-dma: Add burst case of 4
  clk: ccu-sun8i-a33: Add CLK_SET_RATE_PARENT to ac-dig
  ASoC: sun4i-i2s: Add apb reset
  ASoC: Add sun8i analog codec driver
  mfd: sun6i-prcm: Add sun8i analog codec as subnode
  ASoC: Add sun8i digital audio codec
  ASoC: Add sun8i audio card
  dt-bindings: sound: Add sun8i analog codec documentation
  dt-bindings: sound: Add sun8i codec documentation
  dt-bindings: sound: Add sun8i audio card documentation
  ARM: dts: sun8i: Add analog codec on prcm node
  ARM: dts: sun8i: Add audio codec, dai and card for A33
  ARM: dts: sun8i: parrot: Enable audio nodes
  ARM: dts: sun8i: sinlinx: Enable audio nodes

 .../devicetree/bindings/sound/sun8i-audio.txt      |  17 +
 .../bindings/sound/sun8i-codec-analog.txt          |  20 +
 .../devicetree/bindings/sound/sun8i-codec.txt      |  24 +
 arch/arm/boot/dts/sun8i-a23-a33.dtsi               |   7 +
 arch/arm/boot/dts/sun8i-a33-sinlinx-sina33.dts     |   8 +
 arch/arm/boot/dts/sun8i-a33.dtsi                   |  33 ++
 arch/arm/boot/dts/sun8i-r16-parrot.dts             |   8 +
 drivers/clk/sunxi-ng/ccu-sun8i-a33.c               |   2 +-
 drivers/dma/sun6i-dma.c                            |   2 +
 drivers/mfd/sun6i-prcm.c                           |  16 +
 sound/soc/sunxi/Kconfig                            |  30 ++
 sound/soc/sunxi/Makefile                           |   3 +
 sound/soc/sunxi/sun4i-i2s.c                        |  16 +-
 sound/soc/sunxi/sun8i-codec-analog.c               | 305
+++++++++++++ sound/soc/sunxi/sun8i-codec.c                      |
492 +++++++++++++++++++++
sound/soc/sunxi/sun8i.c                            | 101 +++++ 16
files changed, 1082 insertions(+), 2 deletions(-) create mode 100644
Documentation/devicetree/bindings/sound/sun8i-audio.txt create mode
100644 Documentation/devicetree/bindings/sound/sun8i-codec-analog.txt
create mode 100644
Documentation/devicetree/bindings/sound/sun8i-codec.txt create mode
100644 sound/soc/sunxi/sun8i-codec-analog.c create mode 100644
sound/soc/sunxi/sun8i-codec.c create mode 100644
sound/soc/sunxi/sun8i.c