diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0140-Allow-up-to-24dB-digital-gain-to-be-applied-when-usi.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0140-Allow-up-to-24dB-digital-gain-to-be-applied-when-usi.patch | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0140-Allow-up-to-24dB-digital-gain-to-be-applied-when-usi.patch b/target/linux/brcm2708/patches-4.4/0140-Allow-up-to-24dB-digital-gain-to-be-applied-when-usi.patch deleted file mode 100644 index bb4f692e8c..0000000000 --- a/target/linux/brcm2708/patches-4.4/0140-Allow-up-to-24dB-digital-gain-to-be-applied-when-usi.patch +++ /dev/null @@ -1,99 +0,0 @@ -From fb80a497382f9c693ad78524fb0c17454bd9b7f4 Mon Sep 17 00:00:00 2001 -From: Digital Dreamtime <clive.messer@digitaldreamtime.co.uk> -Date: Thu, 4 Feb 2016 14:14:44 +0000 -Subject: [PATCH] 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. ---- - arch/arm/boot/dts/overlays/README | 17 +++++++++++++++-- - .../boot/dts/overlays/iqaudio-dacplus-overlay.dts | 6 +++++- - sound/soc/bcm/iqaudio-dac.c | 20 ++++++++++++++------ - 3 files changed, 34 insertions(+), 9 deletions(-) - ---- a/arch/arm/boot/dts/overlays/README -+++ b/arch/arm/boot/dts/overlays/README -@@ -362,8 +362,21 @@ Params: <None> - - Name: iqaudio-dacplus - Info: Configures the IQaudio DAC+ audio card --Load: dtoverlay=iqaudio-dacplus --Params: <None> -+Load: dtoverlay=iqaudio-dacplus,<param>=<val> -+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec -+ Digital volume control. Enable with -+ "dtoverlay=iqaudio-dacplus,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: lirc-rpi ---- a/arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts -+++ b/arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts -@@ -7,7 +7,7 @@ - - fragment@0 { - target = <&sound>; -- __overlay__ { -+ frag0: __overlay__ { - compatible = "iqaudio,iqaudio-dac"; - i2s-controller = <&i2s>; - status = "okay"; -@@ -36,4 +36,8 @@ - }; - }; - }; -+ -+ __overrides__ { -+ 24db_digital_gain = <&frag0>,"iqaudio,24db_digital_gain?"; -+ }; - }; ---- a/sound/soc/bcm/iqaudio-dac.c -+++ b/sound/soc/bcm/iqaudio-dac.c -@@ -23,14 +23,19 @@ - #include <sound/soc.h> - #include <sound/jack.h> - -+static bool digital_gain_0db_limit = true; -+ - static int snd_rpi_iqaudio_dac_init(struct snd_soc_pcm_runtime *rtd) - { -- int ret; -- struct snd_soc_card *card = rtd->card; -- -- ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207); -- if (ret < 0) -- dev_warn(card->dev, "Failed to set volume limit: %d\n", ret); -+ if (digital_gain_0db_limit) -+ { -+ int ret; -+ struct snd_soc_card *card = rtd->card; -+ -+ ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207); -+ if (ret < 0) -+ dev_warn(card->dev, "Failed to set volume limit: %d\n", ret); -+ } - - return 0; - } -@@ -94,6 +99,9 @@ static int snd_rpi_iqaudio_dac_probe(str - dai->platform_name = NULL; - dai->platform_of_node = i2s_node; - } -+ -+ digital_gain_0db_limit = !of_property_read_bool(pdev->dev.of_node, -+ "iqaudio,24db_digital_gain"); - } - - ret = snd_soc_register_card(&snd_rpi_iqaudio_dac); |