diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.18/0084-Add-a-parameter-to-turn-off-SPDIF-output-if-no-audio.patch')
| -rwxr-xr-x | target/linux/brcm2708/patches-3.18/0084-Add-a-parameter-to-turn-off-SPDIF-output-if-no-audio.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-3.18/0084-Add-a-parameter-to-turn-off-SPDIF-output-if-no-audio.patch b/target/linux/brcm2708/patches-3.18/0084-Add-a-parameter-to-turn-off-SPDIF-output-if-no-audio.patch new file mode 100755 index 0000000000..2a6f816aed --- /dev/null +++ b/target/linux/brcm2708/patches-3.18/0084-Add-a-parameter-to-turn-off-SPDIF-output-if-no-audio.patch @@ -0,0 +1,77 @@ +From a09a8ebce7251e2a42668bd5ae57c12ed24fdca8 Mon Sep 17 00:00:00 2001 +From: Daniel Matuschek <daniel@hifiberry.com> +Date: Sat, 31 Jan 2015 16:07:56 +0100 +Subject: [PATCH 084/114] Add a parameter to turn off SPDIF output if no audio + is playing + +This patch adds the paramater auto_shutdown_output to the kernel module. +Default behaviour of the module is the same, but when auto_shutdown_output +is set to 1, the SPDIF oputput will shutdown if no stream is playing. +--- + sound/soc/bcm/hifiberry_digi.c | 29 ++++++++++++++++++++++++++++- + 1 file changed, 28 insertions(+), 1 deletion(-) + +diff --git a/sound/soc/bcm/hifiberry_digi.c b/sound/soc/bcm/hifiberry_digi.c +index 76af8a6..b0e3d28 100644 +--- a/sound/soc/bcm/hifiberry_digi.c ++++ b/sound/soc/bcm/hifiberry_digi.c +@@ -26,6 +26,11 @@ + + #include "../codecs/wm8804.h" + ++static short int auto_shutdown_output = 0; ++module_param(auto_shutdown_output, short, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); ++MODULE_PARM_DESC(auto_shutdown_output, "Shutdown SP/DIF output if playback is stopped"); ++ ++ + static int samplerate=44100; + + static int snd_rpi_hifiberry_digi_init(struct snd_soc_pcm_runtime *rtd) +@@ -38,6 +43,25 @@ static int snd_rpi_hifiberry_digi_init(struct snd_soc_pcm_runtime *rtd) + return 0; + } + ++static int snd_rpi_hifiberry_digi_startup(struct snd_pcm_substream *substream) { ++ /* turn on digital output */ ++ struct snd_soc_pcm_runtime *rtd = substream->private_data; ++ struct snd_soc_codec *codec = rtd->codec; ++ snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00); ++ return 0; ++} ++ ++static void snd_rpi_hifiberry_digi_shutdown(struct snd_pcm_substream *substream) { ++ /* turn off output */ ++ if (auto_shutdown_output) { ++ /* turn off output */ ++ struct snd_soc_pcm_runtime *rtd = substream->private_data; ++ struct snd_soc_codec *codec = rtd->codec; ++ snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c); ++ } ++} ++ ++ + static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) + { +@@ -70,7 +94,8 @@ static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream, + break; + default: + dev_err(substream->pcm->dev, +- "Failed to set WM8804 SYSCLK, unsupported samplerate\n"); ++ "Failed to set WM8804 SYSCLK, unsupported samplerate %d\n", ++ samplerate); + } + + snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div); +@@ -96,6 +121,8 @@ static int snd_rpi_hifiberry_digi_hw_params(struct snd_pcm_substream *substream, + /* machine stream operations */ + static struct snd_soc_ops snd_rpi_hifiberry_digi_ops = { + .hw_params = snd_rpi_hifiberry_digi_hw_params, ++ .startup = snd_rpi_hifiberry_digi_startup, ++ .shutdown = snd_rpi_hifiberry_digi_shutdown, + }; + + static struct snd_soc_dai_link snd_rpi_hifiberry_digi_dai[] = { +-- +1.8.3.2 + |