3fc661a98c
As usual these patches were extracted from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also alphabetically order sound-soc kernel packages. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
60 lines
2.4 KiB
Diff
60 lines
2.4 KiB
Diff
From ba4e2749004660d573c0d62f6fec876cd152bd3e Mon Sep 17 00:00:00 2001
|
|
From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
|
|
Date: Fri, 6 May 2016 09:42:55 +0100
|
|
Subject: [PATCH 327/381] Allow up to 24dB digital gain to be applied when
|
|
using IQAudIO DAC
|
|
|
|
24db_digital_gain DT param can be used to specify that PCM512x
|
|
codec "Digital" volume control should not be limited to 0dB gain,
|
|
and if specified will allow the full 24dB gain.
|
|
|
|
Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
|
|
---
|
|
arch/arm/boot/dts/overlays/README | 17 +++++++++++++++--
|
|
arch/arm/boot/dts/overlays/iqaudio-dac-overlay.dts | 6 +++++-
|
|
2 files changed, 20 insertions(+), 3 deletions(-)
|
|
|
|
--- a/arch/arm/boot/dts/overlays/README
|
|
+++ b/arch/arm/boot/dts/overlays/README
|
|
@@ -490,8 +490,21 @@ Params: <None>
|
|
|
|
Name: iqaudio-dac
|
|
Info: Configures the IQaudio DAC audio card
|
|
-Load: dtoverlay=iqaudio-dac
|
|
-Params: <None>
|
|
+Load: dtoverlay=iqaudio-dac,<param>
|
|
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
|
|
+ Digital volume control. Enable with
|
|
+ "dtoverlay=iqaudio-dac,24db_digital_gain"
|
|
+ (The default behaviour is that the Digital
|
|
+ volume control is limited to a maximum of
|
|
+ 0dB. ie. it can attenuate but not provide
|
|
+ gain. For most users, this will be desired
|
|
+ as it will prevent clipping. By appending
|
|
+ the 24db_digital_gain parameter, the Digital
|
|
+ volume control will allow up to 24dB of
|
|
+ gain. If this parameter is enabled, it is the
|
|
+ responsibility of the user to ensure that
|
|
+ the Digital volume control is set to a value
|
|
+ that does not result in clipping/distortion!)
|
|
|
|
|
|
Name: iqaudio-dacplus
|
|
--- a/arch/arm/boot/dts/overlays/iqaudio-dac-overlay.dts
|
|
+++ b/arch/arm/boot/dts/overlays/iqaudio-dac-overlay.dts
|
|
@@ -30,10 +30,14 @@
|
|
|
|
fragment@2 {
|
|
target = <&sound>;
|
|
- __overlay__ {
|
|
+ frag2: __overlay__ {
|
|
compatible = "iqaudio,iqaudio-dac";
|
|
i2s-controller = <&i2s>;
|
|
status = "okay";
|
|
};
|
|
};
|
|
+
|
|
+ __overrides__ {
|
|
+ 24db_digital_gain = <&frag2>,"iqaudio,24db_digital_gain?";
|
|
+ };
|
|
};
|