OpenWrt – Rev 4
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From f7045758fffa176ea68730ea855415e619bf516d Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Sat, 3 Mar 2018 16:25:19 +0000
Subject: [PATCH 240/454] audioinjector-octo: Add continuous clock feature
By user request, add a switch to prevent the clocks being stopped when
the stream is paused, stopped or shutdown. Provide access to the switch
by adding a 'non-stop-clocks' parameter to the audioinjector-addons
overlay.
See: https://github.com/raspberrypi/linux/issues/2409
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/README | 5 +++--
.../overlays/audioinjector-addons-overlay.dts | 6 +++++-
sound/soc/bcm/audioinjector-octo-soundcard.c | 19 +++++++++++--------
3 files changed, 19 insertions(+), 11 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -357,8 +357,9 @@ Params: interrupt GPIO use
Name: audioinjector-addons
Info: Configures the audioinjector.net audio add on soundcards
-Load: dtoverlay=audioinjector-addons
-Params: <None>
+Load: dtoverlay=audioinjector-addons,<param>=<val>
+Params: non-stop-clocks Keeps the clocks running even when the stream
+ is paused or stopped (default off)
Name: audioinjector-wm8731-audio
--- a/arch/arm/boot/dts/overlays/audioinjector-addons-overlay.dts
+++ b/arch/arm/boot/dts/overlays/audioinjector-addons-overlay.dts
@@ -42,7 +42,7 @@
fragment@2 {
target = <&sound>;
- __overlay__ {
+ snd: __overlay__ {
compatible = "ai,audioinjector-octo-soundcard";
mult-gpios = <&gpio 27 0>, <&gpio 22 0>, <&gpio 23 0>,
<&gpio 24 0>;
@@ -52,4 +52,8 @@
status = "okay";
};
};
+
+ __overrides__ {
+ non-stop-clocks = <&snd>, "non-stop-clocks?";
+ };
};
--- a/sound/soc/bcm/audioinjector-octo-soundcard.c
+++ b/sound/soc/bcm/audioinjector-octo-soundcard.c
@@ -29,6 +29,7 @@
static struct gpio_descs *mult_gpios;
static struct gpio_desc *codec_rst_gpio;
static unsigned int audioinjector_octo_rate;
+static bool non_stop_clocks;
static const unsigned int audioinjector_octo_rates[] = {
96000, 48000, 32000, 24000, 16000, 8000, 88200, 44100, 29400, 22050, 14700,
@@ -133,12 +134,16 @@ static int audioinjector_octo_hw_params(
static int audioinjector_octo_trigger(struct snd_pcm_substream *substream,
int cmd){
int mult[4];
- mult[0] = 0;
- mult[1] = 0;
- mult[2] = 0;
- mult[3] = 0;
+
+ memset(mult, 0, sizeof(mult));
switch (cmd) {
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (!non_stop_clocks)
+ break;
+ /* Drop through... */
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
@@ -177,10 +182,6 @@ static int audioinjector_octo_trigger(st
return -EINVAL;
}
break;
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- break;
default:
return -EINVAL;
}
@@ -276,6 +277,8 @@ static int audioinjector_octo_probe(stru
if (IS_ERR(codec_rst_gpio))
return PTR_ERR(codec_rst_gpio);
+ non_stop_clocks = of_property_read_bool(pdev->dev.of_node, "non-stop-clocks");
+
if (codec_rst_gpio)
gpiod_set_value(codec_rst_gpio, 1);
msleep(500);