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Message-Id: <20240426-dapm-docs-v2-7-87b07547eb5b@bootlin.com>
Date: Fri, 26 Apr 2024 18:56:40 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
Jonathan Corbet <corbet@....net>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
Bagas Sanjaya <bagasdotme@...il.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
linux-sound@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH v2 07/12] ASoC: doc: dapm: extend initial descrption
Extend the initial description providing clearer definitions of "widget"
and "route", and to stop using the word "component" to mean "widget". Give
more details and clarify wording and add a picture representing a real DAPM
graph.
Group all the introductory paragraphs before the "DAPM power domains", and
split the latter to a specific section.
Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
Documentation/sound/soc/dapm-graph.svg | 375 +++++++++++++++++++++++++++++++++
Documentation/sound/soc/dapm.rst | 30 ++-
2 files changed, 396 insertions(+), 9 deletions(-)
diff --git a/Documentation/sound/soc/dapm-graph.svg b/Documentation/sound/soc/dapm-graph.svg
new file mode 100644
index 000000000000..d783672db815
--- /dev/null
+++ b/Documentation/sound/soc/dapm-graph.svg
@@ -0,0 +1,375 @@
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+<!-- cs42l51.0-004a_Left ADC->cs42l51.0-004a_Capture -->
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+<text text-anchor="middle" x="400" y="-393.8" font-family="sans-serif" font-size="14.00">[mixer]</text>
+</g>
+<!-- cs42l51.0-004a_MICL->cs42l51.0-004a_Mic Preamp Left -->
+<g id="edge12" class="edge">
+<title>cs42l51.0-004a_MICL->cs42l51.0-004a_Mic Preamp Left</title>
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+</g>
+<!-- cs42l51.0-004a_MICR -->
+<g id="node18" class="node">
+<title>cs42l51.0-004a_MICR</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="501.5,-583 440.5,-583 440.5,-545 501.5,-545 501.5,-583"/>
+<text text-anchor="middle" x="471" y="-567.8" font-family="sans-serif" font-size="14.00">MICR</text>
+<text text-anchor="middle" x="471" y="-552.8" font-family="sans-serif" font-size="14.00">[input]</text>
+</g>
+<!-- cs42l51.0-004a_Mic Preamp Right -->
+<g id="node21" class="node">
+<title>cs42l51.0-004a_Mic Preamp Right</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="550.5,-509 417.5,-509 417.5,-471 550.5,-471 550.5,-509"/>
+<text text-anchor="middle" x="484" y="-493.8" font-family="sans-serif" font-size="14.00">Mic Preamp Right</text>
+<text text-anchor="middle" x="484" y="-478.8" font-family="sans-serif" font-size="14.00">[mixer]</text>
+</g>
+<!-- cs42l51.0-004a_MICR->cs42l51.0-004a_Mic Preamp Right -->
+<g id="edge13" class="edge">
+<title>cs42l51.0-004a_MICR->cs42l51.0-004a_Mic Preamp Right</title>
+<path fill="none" stroke="black" d="M474.28,-544.83C475.67,-537.13 477.32,-527.97 478.87,-519.42"/>
+<polygon fill="black" stroke="black" points="482.34,-519.88 480.68,-509.41 475.45,-518.63 482.34,-519.88"/>
+</g>
+<!-- cs42l51.0-004a_Mic Bias -->
+<g id="node19" class="node">
+<title>cs42l51.0-004a_Mic Bias</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="409.5,-583 338.5,-583 338.5,-545 409.5,-545 409.5,-583"/>
+<text text-anchor="middle" x="374" y="-567.8" font-family="sans-serif" font-size="14.00">Mic Bias</text>
+<text text-anchor="middle" x="374" y="-552.8" font-family="sans-serif" font-size="14.00">[supply]</text>
+</g>
+<!-- cs42l51.0-004a_Mic Bias->cs42l51.0-004a_MICL -->
+<g id="edge11" class="edge">
+<title>cs42l51.0-004a_Mic Bias->cs42l51.0-004a_MICL</title>
+<path fill="none" stroke="black" d="M372.74,-544.83C372.2,-537.13 371.57,-527.97 370.97,-519.42"/>
+<polygon fill="black" stroke="black" points="374.46,-519.15 370.28,-509.41 367.48,-519.63 374.46,-519.15"/>
+</g>
+<!-- cs42l51.0-004a_PGA-ADC Mux Left->cs42l51.0-004a_Left PGA -->
+<g id="edge10" class="edge">
+<title>cs42l51.0-004a_PGA-ADC Mux Left->cs42l51.0-004a_Left PGA</title>
+<path fill="none" stroke="black" d="M804.92,-470.99C804.27,-460.3 803.44,-446.5 802.71,-434.37"/>
+<polygon fill="black" stroke="black" points="806.2,-434.03 802.1,-424.26 799.21,-434.45 806.2,-434.03"/>
+</g>
+<!-- cs42l51.0-004a_Right PGA -->
+<g id="node27" class="node">
+<title>cs42l51.0-004a_Right PGA</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="688.5,-424 605.5,-424 605.5,-386 688.5,-386 688.5,-424"/>
+<text text-anchor="middle" x="647" y="-408.8" font-family="sans-serif" font-size="14.00">Right PGA</text>
+<text text-anchor="middle" x="647" y="-393.8" font-family="sans-serif" font-size="14.00">[pga]</text>
+</g>
+<!-- cs42l51.0-004a_PGA-ADC Mux Right->cs42l51.0-004a_Right PGA -->
+<g id="edge19" class="edge">
+<title>cs42l51.0-004a_PGA-ADC Mux Right->cs42l51.0-004a_Right PGA</title>
+<path fill="none" stroke="black" d="M643.87,-470.99C644.38,-460.3 645.05,-446.5 645.63,-434.37"/>
+<polygon fill="black" stroke="black" points="649.13,-434.42 646.12,-424.26 642.14,-434.08 649.13,-434.42"/>
+</g>
+<!-- cs42l51.0-004a_Playback->cs42l51.0-004a_DAC Mux -->
+<g id="edge5" class="edge">
+<title>cs42l51.0-004a_Playback->cs42l51.0-004a_DAC Mux</title>
+<path fill="none" stroke="black" d="M560,-237.83C560,-230.13 560,-220.97 560,-212.42"/>
+<polygon fill="black" stroke="black" points="563.5,-212.41 560,-202.41 556.5,-212.41 563.5,-212.41"/>
+</g>
+<!-- cs42l51.0-004a_Right ADC -->
+<g id="node25" class="node">
+<title>cs42l51.0-004a_Right ADC</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="697,-350 613,-350 613,-312 697,-312 697,-350"/>
+<text text-anchor="middle" x="655" y="-334.8" font-family="sans-serif" font-size="14.00">Right ADC</text>
+<text text-anchor="middle" x="655" y="-319.8" font-family="sans-serif" font-size="14.00">[adc]</text>
+</g>
+<!-- cs42l51.0-004a_Right ADC->cs42l51.0-004a_Capture -->
+<g id="edge3" class="edge">
+<title>cs42l51.0-004a_Right ADC->cs42l51.0-004a_Capture</title>
+<path fill="none" stroke="black" d="M655,-311.83C655,-304.13 655,-294.97 655,-286.42"/>
+<polygon fill="black" stroke="black" points="658.5,-286.41 655,-276.41 651.5,-286.41 658.5,-286.41"/>
+</g>
+<!-- cs42l51.0-004a_Right DAC->cs42l51.0-004a_HPR -->
+<g id="edge7" class="edge">
+<title>cs42l51.0-004a_Right DAC->cs42l51.0-004a_HPR</title>
+<path fill="none" stroke="black" d="M608,-89.83C608,-82.13 608,-72.97 608,-64.42"/>
+<polygon fill="black" stroke="black" points="611.5,-64.41 608,-54.41 604.5,-64.41 611.5,-64.41"/>
+</g>
+<!-- cs42l51.0-004a_Right PGA->cs42l51.0-004a_Right ADC -->
+<g id="edge17" class="edge">
+<title>cs42l51.0-004a_Right PGA->cs42l51.0-004a_Right ADC</title>
+<path fill="none" stroke="black" d="M649.02,-385.83C649.87,-378.13 650.89,-368.97 651.84,-360.42"/>
+<polygon fill="black" stroke="black" points="655.33,-360.74 652.95,-350.41 648.37,-359.97 655.33,-360.74"/>
+</g>
+<!-- hdmi-audio-codec.1.auto_TX -->
+<g id="node30" class="node">
+<title>hdmi-audio-codec.1.auto_TX</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="281.5,-509 210.5,-509 210.5,-471 281.5,-471 281.5,-509"/>
+<text text-anchor="middle" x="246" y="-493.8" font-family="sans-serif" font-size="14.00">TX</text>
+<text text-anchor="middle" x="246" y="-478.8" font-family="sans-serif" font-size="14.00">[output]</text>
+</g>
+<!-- hdmi-audio-codec.1.auto_I2S Playback->hdmi-audio-codec.1.auto_TX -->
+<g id="edge22" class="edge">
+<title>hdmi-audio-codec.1.auto_I2S Playback->hdmi-audio-codec.1.auto_TX</title>
+<path fill="none" stroke="black" d="M254.22,-544.83C253.05,-537.13 251.65,-527.97 250.34,-519.42"/>
+<polygon fill="black" stroke="black" points="253.78,-518.77 248.81,-509.41 246.86,-519.83 253.78,-518.77"/>
+</g>
+<!-- hdmi-audio-codec.1.auto_RX -->
+<g id="node29" class="node">
+<title>hdmi-audio-codec.1.auto_RX</title>
+<polygon fill="#f2f2f2" stroke="#4d4d4d" points="189.5,-583 118.5,-583 118.5,-545 189.5,-545 189.5,-583"/>
+<text text-anchor="middle" x="154" y="-567.8" font-family="sans-serif" font-size="14.00">RX</text>
+<text text-anchor="middle" x="154" y="-552.8" font-family="sans-serif" font-size="14.00">[output]</text>
+</g>
+<!-- hdmi-audio-codec.1.auto_RX->hdmi-audio-codec.1.auto_Capture -->
+<g id="edge20" class="edge">
+<title>hdmi-audio-codec.1.auto_RX->hdmi-audio-codec.1.auto_Capture</title>
+<path fill="none" stroke="black" d="M154.25,-544.83C154.36,-537.13 154.49,-527.97 154.61,-519.42"/>
+<polygon fill="black" stroke="black" points="158.1,-519.46 154.74,-509.41 151.11,-519.36 158.1,-519.46"/>
+</g>
+</g>
+</svg>
diff --git a/Documentation/sound/soc/dapm.rst b/Documentation/sound/soc/dapm.rst
index 11f7f2f685af..58ef880ac8b6 100644
--- a/Documentation/sound/soc/dapm.rst
+++ b/Documentation/sound/soc/dapm.rst
@@ -17,9 +17,27 @@ recompiling are required for user space applications to use it. DAPM makes
power switching decisions based upon any audio stream (capture/playback)
activity and audio mixer settings within the device.
-DAPM spans the whole machine. It covers power control within the entire
-audio subsystem, this includes internal codec power blocks and machine
-level power systems.
+DAPM is based on two basic elements, called widgets and routes:
+
+ * a **widget** is every part of the audio hardware that can be enabled by
+ software when in use and disabled to save power when not in use
+ * a **route** is an interconnection between widgets that exists when sound
+ can flow from one widget to the other
+
+All DAPM power switching decisions are made automatically by consulting an
+audio routing graph. This graph is specific to each sound card and spans
+the whole sound card, so some DAPM routes connect two widgets belonging to
+different components (e.g. the LINE OUT pin of a CODEC and the input pin of
+an amplifier).
+
+The graph for the STM32MP1-DK1 sound card is shown in picture:
+
+.. kernel-figure:: dapm-graph.svg
+ :alt: Example DAPM graph
+ :align: center
+
+DAPM power domains
+==================
There are 4 power domains within DAPM:
@@ -48,12 +66,6 @@ Stream domain
Enabled and disabled when stream playback/capture is started and
stopped respectively. e.g. aplay, arecord.
-All DAPM power switching decisions are made automatically by consulting an audio
-routing graph of the whole machine. This graph is specific to each machine and
-consists of the interconnections between every audio component (including
-internal codec components). All audio components that affect power are called
-widgets hereafter.
-
DAPM Widgets
============
--
2.34.1
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