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audioinjector-octo: Add continuous clock feature

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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>
This commit is contained in:
Phil Elwell
2018-03-03 16:25:19 +00:00
committed by popcornmix
parent b39a15e86b
commit 3e16548bbb
1 changed files with 11 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
sound/soc/bcm/audioinjector-octo-soundcard.c
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@@ -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(struct snd_pcm_substream *substream,
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(struct snd_pcm_substream *substream,
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(struct platform_device *pdev)
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);