On 5/2/19 9:48 PM, mac.chiang@intel.com wrote:
From: Mac Chiang mac.chiang@intel.com
amplifier feedback is not modeled as being dependent on any active output. Even when there is no playback happening, parts of the graph, specifically the IV sense->speaker protection->output remains active and this prevents the DSP from entering low-power states.
This patch suggest a machine driver level approach where the speaker pins are enabled/disabled dynamically depending on stream start/stop events. DPAM graph representations show the feedback loop is indeed disabled and low-power states can be reached.
Signed-off-by: Jenny TC jenny.tc@intel.com Signed-off-by: Harshapriya.n harshapriya.n@intel.com Signed-off-by: Mac Chiang mac.chiang@intel.com
Acked-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
Changelog: v4: - Changed device name in in kabylake_ssp0_trigger to address a conflict with recently merged patch MAXIM_DEV0_NAME -> MAX98927_DEV0_NAME ... v3: - fixed the return logic at the end of kabylake_card_late_probe() v2: - described clearly in commit message - added snd_soc_dapm_disable_pin in kabylake_card_late_probe()
sound/soc/intel/boards/kbl_da7219_max98927.c | 73 +++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 2 deletions(-)
diff --git a/sound/soc/intel/boards/kbl_da7219_max98927.c b/sound/soc/intel/boards/kbl_da7219_max98927.c index f72a7bf..1efe7fd 100644 --- a/sound/soc/intel/boards/kbl_da7219_max98927.c +++ b/sound/soc/intel/boards/kbl_da7219_max98927.c @@ -219,8 +219,60 @@ static int kabylake_ssp0_hw_params(struct snd_pcm_substream *substream, return 0; }
+static int kabylake_ssp0_trigger(struct snd_pcm_substream *substream, int cmd) +{
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- int j, ret;
- for (j = 0; j < rtd->num_codecs; j++) {
struct snd_soc_dai *codec_dai = rtd->codec_dais[j];const char *name = codec_dai->component->name;struct snd_soc_component *component = codec_dai->component;struct snd_soc_dapm_context *dapm =snd_soc_component_get_dapm(component);char pin_name[20];if (strcmp(name, MAX98927_DEV0_NAME) &&strcmp(name, MAX98927_DEV1_NAME) &&strcmp(name, MAX98373_DEV0_NAME) &&strcmp(name, MAX98373_DEV1_NAME))continue;snprintf(pin_name, ARRAY_SIZE(pin_name), "%s Spk",codec_dai->component->name_prefix);switch (cmd) {case SNDRV_PCM_TRIGGER_START:case SNDRV_PCM_TRIGGER_RESUME:case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:ret = snd_soc_dapm_enable_pin(dapm, pin_name);if (ret) {dev_err(rtd->dev, "failed to enable %s: %d\n",pin_name, ret);return ret;}snd_soc_dapm_sync(dapm);break;case SNDRV_PCM_TRIGGER_STOP:case SNDRV_PCM_TRIGGER_SUSPEND:case SNDRV_PCM_TRIGGER_PAUSE_PUSH:ret = snd_soc_dapm_disable_pin(dapm, pin_name);if (ret) {dev_err(rtd->dev, "failed to disable %s: %d\n",pin_name, ret);return ret;}snd_soc_dapm_sync(dapm);break;}- }
- return 0;
+}
static struct snd_soc_ops kabylake_ssp0_ops = { .hw_params = kabylake_ssp0_hw_params,
.trigger = kabylake_ssp0_trigger, };
static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
@@ -950,6 +1002,7 @@ static int kabylake_card_late_probe(struct snd_soc_card *card) { struct kbl_codec_private *ctx = snd_soc_card_get_drvdata(card); struct kbl_hdmi_pcm *pcm;
- struct snd_soc_dapm_context *dapm = &card->dapm; struct snd_soc_component *component = NULL; int err, i = 0; char jack_name[NAME_SIZE];
@@ -976,9 +1029,25 @@ static int kabylake_card_late_probe(struct snd_soc_card *card) if (!component) return -EINVAL;
return hdac_hdmi_jack_port_init(component, &card->dapm);
return 0;
err = hdac_hdmi_jack_port_init(component, &card->dapm);
if (err < 0)
return err;err = snd_soc_dapm_disable_pin(dapm, "Left Spk");
if (err) {
dev_err(card->dev, "failed to disable Left Spk: %d\n", err);return err;}
err = snd_soc_dapm_disable_pin(dapm, "Right Spk");
if (err) {
dev_err(card->dev, "failed to disable Right Spk: %d\n", err);return err;}
return snd_soc_dapm_sync(dapm); }
/* kabylake audio machine driver for SPT + DA7219 */