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011f2c26f1
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
83 lines
2.9 KiB
Diff
83 lines
2.9 KiB
Diff
From 8f9baa887c3328ee17a78b05eba51af6c8ffc83e Mon Sep 17 00:00:00 2001
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From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
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Date: Sun, 29 May 2016 05:22:29 +0100
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Subject: [PATCH] Add dt param to force HiFiBerry DAC+ Pro into slave mode
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"dtoverlay=hifiberry-dacplus,slave"
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Add 'slave' param to use HiFiBerry DAC+ Pro in slave mode,
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with Pi as master for bit and frame clock.
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Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
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---
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arch/arm/boot/dts/overlays/README | 2 ++
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arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts | 6 ++++--
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sound/soc/bcm/hifiberry_dacplus.c | 10 ++++++++--
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3 files changed, 14 insertions(+), 4 deletions(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -344,6 +344,8 @@ Params: 24db_digital_gain Allow ga
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responsibility of the user to ensure that
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the Digital volume control is set to a value
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that does not result in clipping/distortion!)
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+ slave Force DAC+ Pro into slave mode, using Pi as
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+ master for bit clock and frame clock.
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Name: hifiberry-digi
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--- a/arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/hifiberry-dacplus-overlay.dts
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@@ -41,7 +41,7 @@
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fragment@3 {
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target = <&sound>;
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- frag3: __overlay__ {
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+ hifiberry_dacplus: __overlay__ {
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compatible = "hifiberry,hifiberry-dacplus";
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i2s-controller = <&i2s>;
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status = "okay";
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@@ -49,6 +49,8 @@
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};
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__overrides__ {
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- 24db_digital_gain = <&frag3>,"hifiberry,24db_digital_gain?";
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+ 24db_digital_gain =
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+ <&hifiberry_dacplus>,"hifiberry,24db_digital_gain?";
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+ slave = <&hifiberry_dacplus>,"hifiberry-dacplus,slave?";
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};
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};
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--- a/sound/soc/bcm/hifiberry_dacplus.c
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+++ b/sound/soc/bcm/hifiberry_dacplus.c
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@@ -47,6 +47,7 @@ struct pcm512x_priv {
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/* Clock rate of CLK48EN attached to GPIO3 pin */
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#define CLK_48EN_RATE 24576000UL
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+static bool slave;
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static bool snd_rpi_hifiberry_is_dacpro;
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static bool digital_gain_0db_limit = true;
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@@ -145,8 +146,11 @@ static int snd_rpi_hifiberry_dacplus_ini
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struct snd_soc_codec *codec = rtd->codec;
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struct pcm512x_priv *priv;
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- snd_rpi_hifiberry_is_dacpro
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- = snd_rpi_hifiberry_dacplus_is_pro_card(codec);
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+ if (slave)
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+ snd_rpi_hifiberry_is_dacpro = false;
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+ else
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+ snd_rpi_hifiberry_is_dacpro =
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+ snd_rpi_hifiberry_dacplus_is_pro_card(codec);
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if (snd_rpi_hifiberry_is_dacpro) {
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struct snd_soc_dai_link *dai = rtd->dai_link;
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@@ -314,6 +318,8 @@ static int snd_rpi_hifiberry_dacplus_pro
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digital_gain_0db_limit = !of_property_read_bool(
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pdev->dev.of_node, "hifiberry,24db_digital_gain");
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+ slave = of_property_read_bool(pdev->dev.of_node,
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+ "hifiberry-dacplus,slave");
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}
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ret = snd_soc_register_card(&snd_rpi_hifiberry_dacplus);
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