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