mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
ASoC: rsnd: add simplified module explanation
Renesas sound driver user needs to read its datasheet when create DT. But it is difficult to understand, because it has many modules (SRC/CTU/MIX/DVC/SSIU/SSI/AudioDMAC/AudioDMACperiperi), and many features (Asynchronous/Synchronous mode on SRC, CTU matrix, DVC volume settings feature, Multi-SSI/TDM-SSI, etc). This patch adds simplified explanation to help setting/understanding. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
parent
09e5907549
commit
f1511a14a4
2 changed files with 363 additions and 0 deletions
|
@ -1,6 +1,337 @@
|
|||
Renesas R-Car sound
|
||||
|
||||
=============================================
|
||||
* Modules
|
||||
=============================================
|
||||
|
||||
Renesas R-Car sound is constructed from below modules
|
||||
(for Gen2 or later)
|
||||
|
||||
SCU : Sampling Rate Converter Unit
|
||||
- SRC : Sampling Rate Converter
|
||||
- CMD
|
||||
- CTU : Channel Transfer Unit
|
||||
- MIX : Mixer
|
||||
- DVC : Digital Volume and Mute Function
|
||||
SSIU : Serial Sound Interface Unit
|
||||
SSI : Serial Sound Interface
|
||||
|
||||
See detail of each module's channels, connection, limitation on datasheet
|
||||
|
||||
=============================================
|
||||
* Multi channel
|
||||
=============================================
|
||||
|
||||
Multi channel is supported by Multi-SSI, or TDM-SSI.
|
||||
|
||||
Multi-SSI : 6ch case, you can use stereo x 3 SSI
|
||||
TDM-SSI : 6ch case, you can use TDM
|
||||
|
||||
=============================================
|
||||
* Enable/Disable each modules
|
||||
=============================================
|
||||
|
||||
See datasheet to check SRC/CTU/MIX/DVC connect-limitation.
|
||||
DT controls enabling/disabling module.
|
||||
${LINUX}/arch/arm/boot/dts/r8a7790-lager.dts can be good example.
|
||||
This is example of
|
||||
|
||||
Playback: [MEM] -> [SRC2] -> [DVC0] -> [SSIU0/SSI0] -> [codec]
|
||||
Capture: [MEM] <- [DVC1] <- [SRC3] <- [SSIU1/SSI1] <- [codec]
|
||||
|
||||
&rcar_sound {
|
||||
...
|
||||
rcar_sound,dai {
|
||||
dai0 {
|
||||
playback = <&ssi0 &src2 &dvc0>;
|
||||
capture = <&ssi1 &src3 &dvc1>;
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
You can use below.
|
||||
${LINUX}/arch/arm/boot/dts/r8a7790.dts can be good example.
|
||||
|
||||
&src0 &ctu00 &mix0 &dvc0 &ssi0
|
||||
&src1 &ctu01 &mix1 &dvc1 &ssi1
|
||||
&src2 &ctu02 &ssi2
|
||||
&src3 &ctu03 &ssi3
|
||||
&src4 &ssi4
|
||||
&src5 &ctu10 &ssi5
|
||||
&src6 &ctu11 &ssi6
|
||||
&src7 &ctu12 &ssi7
|
||||
&src8 &ctu13 &ssi8
|
||||
&src9 &ssi9
|
||||
|
||||
=============================================
|
||||
* SRC (Sampling Rate Converter)
|
||||
=============================================
|
||||
|
||||
[xx]Hz [yy]Hz
|
||||
------> [SRC] ------>
|
||||
|
||||
SRC can convert [xx]Hz to [yy]Hz. Then, it has below 2 modes
|
||||
|
||||
Asynchronous mode: input data / output data are based on different clocks.
|
||||
you can use this mode on Playback / Capture
|
||||
Synchronous mode: input data / output data are based on same clocks.
|
||||
This mode will be used if system doesn't have its input clock,
|
||||
for example digital TV case.
|
||||
you can use this mode on Playback
|
||||
|
||||
------------------
|
||||
** Asynchronous mode
|
||||
------------------
|
||||
|
||||
You need to use "renesas,rsrc-card" sound card for it.
|
||||
example)
|
||||
|
||||
sound {
|
||||
compatible = "renesas,rsrc-card";
|
||||
...
|
||||
/*
|
||||
* SRC Asynchronous mode setting
|
||||
* Playback:
|
||||
* All input data will be converted to 48kHz
|
||||
* Capture:
|
||||
* Inputed 48kHz data will be converted to
|
||||
* system specified Hz
|
||||
*/
|
||||
convert-rate = <48000>;
|
||||
...
|
||||
cpu {
|
||||
sound-dai = <&rcar_sound>;
|
||||
};
|
||||
codec {
|
||||
...
|
||||
};
|
||||
};
|
||||
|
||||
------------------
|
||||
** Synchronous mode
|
||||
------------------
|
||||
|
||||
> amixer set "SRC Out Rate" on
|
||||
> aplay xxxx.wav
|
||||
> amixer set "SRC Out Rate" 48000
|
||||
> amixer set "SRC Out Rate" 44100
|
||||
|
||||
=============================================
|
||||
* CTU (Channel Transfer Unit)
|
||||
=============================================
|
||||
|
||||
[xx]ch [yy]ch
|
||||
------> [CTU] -------->
|
||||
|
||||
CTU can convert [xx]ch to [yy]ch, or exchange outputed channel.
|
||||
CTU conversion needs matrix settings.
|
||||
For more detail information, see below
|
||||
|
||||
Renesas R-Car datasheet
|
||||
- Sampling Rate Converter Unit (SCU)
|
||||
- SCU Operation
|
||||
- CMD Block
|
||||
- Functional Blocks in CMD
|
||||
|
||||
Renesas R-Car datasheet
|
||||
- Sampling Rate Converter Unit (SCU)
|
||||
- Register Description
|
||||
- CTUn Scale Value exx Register (CTUn_SVxxR)
|
||||
|
||||
${LINUX}/sound/soc/sh/rcar/ctu.c
|
||||
- comment of header
|
||||
|
||||
You need to use "renesas,rsrc-card" sound card for it.
|
||||
example)
|
||||
|
||||
sound {
|
||||
compatible = "renesas,rsrc-card";
|
||||
...
|
||||
/*
|
||||
* CTU setting
|
||||
* All input data will be converted to 2ch
|
||||
* as output data
|
||||
*/
|
||||
convert-channels = <2>;
|
||||
...
|
||||
cpu {
|
||||
sound-dai = <&rcar_sound>;
|
||||
};
|
||||
codec {
|
||||
...
|
||||
};
|
||||
};
|
||||
|
||||
Ex) Exchange output channel
|
||||
Input -> Output
|
||||
1ch -> 0ch
|
||||
0ch -> 1ch
|
||||
|
||||
example of using matrix
|
||||
output 0ch = (input 0ch x 0) + (input 1ch x 1)
|
||||
output 1ch = (input 0ch x 1) + (input 1ch x 0)
|
||||
|
||||
amixer set "CTU Reset" on
|
||||
amixer set "CTU Pass" 9,10
|
||||
amixer set "CTU SV0" 0,4194304
|
||||
amixer set "CTU SV1" 4194304,0
|
||||
|
||||
example of changing connection
|
||||
amixer set "CTU Reset" on
|
||||
amixer set "CTU Pass" 2,1
|
||||
|
||||
=============================================
|
||||
* MIX (Mixer)
|
||||
=============================================
|
||||
|
||||
MIX merges 2 sounds path. You can see 2 sound interface on system,
|
||||
and these sounds will be merged by MIX.
|
||||
|
||||
aplay -D plughw:0,0 xxxx.wav &
|
||||
aplay -D plughw:0,1 yyyy.wav
|
||||
|
||||
You need to use "renesas,rsrc-card" sound card for it.
|
||||
Ex)
|
||||
[MEM] -> [SRC1] -> [CTU02] -+-> [MIX0] -> [DVC0] -> [SSI0]
|
||||
|
|
||||
[MEM] -> [SRC2] -> [CTU03] -+
|
||||
|
||||
sound {
|
||||
compatible = "renesas,rsrc-card";
|
||||
...
|
||||
cpu@0 {
|
||||
sound-dai = <&rcar_sound 0>;
|
||||
};
|
||||
cpu@1 {
|
||||
sound-dai = <&rcar_sound 1>;
|
||||
};
|
||||
codec {
|
||||
...
|
||||
};
|
||||
};
|
||||
|
||||
&rcar_sound {
|
||||
...
|
||||
rcar_sound,dai {
|
||||
dai0 {
|
||||
playback = <&src1 &ctu02 &mix0 &dvc0 &ssi0>;
|
||||
};
|
||||
dai1 {
|
||||
playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
=============================================
|
||||
* DVC (Digital Volume and Mute Function)
|
||||
=============================================
|
||||
|
||||
DVC controls Playback/Capture volume.
|
||||
|
||||
Playback Volume
|
||||
amixer set "DVC Out" 100%
|
||||
|
||||
Capture Volume
|
||||
amixer set "DVC In" 100%
|
||||
|
||||
Playback Mute
|
||||
amixer set "DVC Out Mute" on
|
||||
|
||||
Capture Mute
|
||||
amixer set "DVC In Mute" on
|
||||
|
||||
Volume Ramp
|
||||
amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
|
||||
amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
|
||||
amixer set "DVC Out Ramp" on
|
||||
aplay xxx.wav &
|
||||
amixer set "DVC Out" 80% // Volume Down
|
||||
amixer set "DVC Out" 100% // Volume Up
|
||||
|
||||
=============================================
|
||||
* SSIU (Serial Sound Interface Unit)
|
||||
=============================================
|
||||
|
||||
There is no DT settings for SSIU, because SSIU will be automatically
|
||||
selected via SSI.
|
||||
SSIU can avoid some under/over run error, because it has some buffer.
|
||||
But you can't use it if SSI was PIO mode.
|
||||
In DMA mode, you can select not to use SSIU by using "no-busif" on DT.
|
||||
|
||||
&ssi0 {
|
||||
no-busif;
|
||||
};
|
||||
|
||||
=============================================
|
||||
* SSI (Serial Sound Interface)
|
||||
=============================================
|
||||
|
||||
** PIO mode
|
||||
|
||||
You can use PIO mode which is for connection check by using.
|
||||
Note: The system will drop non-SSI modules in PIO mode
|
||||
even though if DT is selecting other modules.
|
||||
|
||||
&ssi0 {
|
||||
pio-transfer
|
||||
};
|
||||
|
||||
** DMA mode without SSIU
|
||||
|
||||
You can use DMA without SSIU.
|
||||
Note: under/over run, or noise are likely to occur
|
||||
|
||||
&ssi0 {
|
||||
no-busif;
|
||||
};
|
||||
|
||||
** PIN sharing
|
||||
|
||||
Each SSI can share WS pin. It is based on platform.
|
||||
This is example if SSI1 want to share WS pin with SSI0
|
||||
|
||||
&ssi1 {
|
||||
shared-pin;
|
||||
};
|
||||
|
||||
** Multi-SSI
|
||||
|
||||
You can use Multi-SSI.
|
||||
This is example of SSI0/SSI1/SSI2 (= for 6ch)
|
||||
|
||||
&rcar_sound {
|
||||
...
|
||||
rcar_sound,dai {
|
||||
dai0 {
|
||||
playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>;
|
||||
};
|
||||
};
|
||||
};
|
||||
|
||||
** TDM-SSI
|
||||
|
||||
You can use TDM with SSI.
|
||||
This is example of TDM 6ch.
|
||||
Driver can automatically switches TDM <-> stereo mode in this case.
|
||||
|
||||
rsnd_tdm: sound {
|
||||
compatible = "simple-audio-card";
|
||||
...
|
||||
simple-audio-card,cpu {
|
||||
/* system can use TDM 6ch */
|
||||
dai-tdm-slot-num = <6>;
|
||||
sound-dai = <&rcar_sound>;
|
||||
};
|
||||
simple-audio-card,codec {
|
||||
...
|
||||
};
|
||||
};
|
||||
|
||||
|
||||
=============================================
|
||||
Required properties:
|
||||
=============================================
|
||||
|
||||
- compatible : "renesas,rcar_sound-<soctype>", fallbacks
|
||||
"renesas,rcar_sound-gen1" if generation1, and
|
||||
"renesas,rcar_sound-gen2" if generation2
|
||||
|
@ -64,7 +395,10 @@ DAI subnode properties:
|
|||
- playback : list of playback modules
|
||||
- capture : list of capture modules
|
||||
|
||||
|
||||
=============================================
|
||||
Example:
|
||||
=============================================
|
||||
|
||||
rcar_sound: sound@ec500000 {
|
||||
#sound-dai-cells = <1>;
|
||||
|
@ -250,7 +584,9 @@ rcar_sound: sound@ec500000 {
|
|||
};
|
||||
};
|
||||
|
||||
=============================================
|
||||
Example: simple sound card
|
||||
=============================================
|
||||
|
||||
rsnd_ak4643: sound {
|
||||
compatible = "simple-audio-card";
|
||||
|
@ -290,7 +626,9 @@ Example: simple sound card
|
|||
shared-pin;
|
||||
};
|
||||
|
||||
=============================================
|
||||
Example: simple sound card for TDM
|
||||
=============================================
|
||||
|
||||
rsnd_tdm: sound {
|
||||
compatible = "simple-audio-card";
|
||||
|
@ -309,7 +647,9 @@ Example: simple sound card for TDM
|
|||
};
|
||||
};
|
||||
|
||||
=============================================
|
||||
Example: simple sound card for Multi channel
|
||||
=============================================
|
||||
|
||||
&rcar_sound {
|
||||
pinctrl-0 = <&sound_pins &sound_clk_pins>;
|
||||
|
|
|
@ -8,6 +8,29 @@
|
|||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Playback Volume
|
||||
* amixer set "DVC Out" 100%
|
||||
*
|
||||
* Capture Volume
|
||||
* amixer set "DVC In" 100%
|
||||
*
|
||||
* Playback Mute
|
||||
* amixer set "DVC Out Mute" on
|
||||
*
|
||||
* Capture Mute
|
||||
* amixer set "DVC In Mute" on
|
||||
*
|
||||
* Volume Ramp
|
||||
* amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
|
||||
* amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
|
||||
* amixer set "DVC Out Ramp" on
|
||||
* aplay xxx.wav &
|
||||
* amixer set "DVC Out" 80% // Volume Down
|
||||
* amixer set "DVC Out" 100% // Volume Up
|
||||
*/
|
||||
|
||||
#include "rsnd.h"
|
||||
|
||||
#define RSND_DVC_NAME_SIZE 16
|
||||
|
|
Loading…
Reference in a new issue