Add debug parameter for snd-sof-acpi.
One of the usages for this debug parameter to disable pm_runtime,
which can be useful for platform bringup, or keep the parent device
active while enabling pm_runtime for child devices (e.g. with
SoundWire or MFD). This can also be useful to measure suspend-resume
latencies or child devices.
Signed-off-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
sound/soc/sof/sof-acpi-dev.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/sound/soc/sof/sof-acpi-dev.c b/sound/soc/sof/sof-acpi-dev.c
index ea7b8b895412..df318f50dd0b 100644
--- a/sound/soc/sof/sof-acpi-dev.c
+++ b/sound/soc/sof/sof-acpi-dev.c
@@ -29,6 +29,12 @@ static char *tplg_path;
module_param(tplg_path, charp, 0444);
MODULE_PARM_DESC(tplg_path, "alternate path for SOF topology.");
+static int sof_acpi_debug;
+module_param_named(sof_acpi_debug, sof_acpi_debug, int, 0444);
+MODULE_PARM_DESC(sof_acpi_debug, "SOF ACPI debug options (0x0 all off)");
+
+#define SOF_ACPI_DISABLE_PM_RUNTIME BIT(0)
+
#if IS_ENABLED(CONFIG_SND_SOC_SOF_HASWELL)
static const struct sof_dev_desc sof_acpi_haswell_desc = {
.machines = snd_soc_acpi_intel_haswell_machines,
@@ -121,6 +127,9 @@ static const struct dev_pm_ops sof_acpi_pm = {
static void sof_acpi_probe_complete(struct device *dev)
{
+ if (sof_acpi_debug & SOF_ACPI_DISABLE_PM_RUNTIME)
+ return;
+
/* allow runtime_pm */
pm_runtime_set_autosuspend_delay(dev, SND_SOF_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(dev);
@@ -221,7 +230,8 @@ static int sof_acpi_probe(struct platform_device *pdev)
static int sof_acpi_remove(struct platform_device *pdev)
{
- pm_runtime_disable(&pdev->dev);
+ if (!(sof_acpi_debug & SOF_ACPI_DISABLE_PM_RUNTIME))
+ pm_runtime_disable(&pdev->dev);
/* call sof helper for DSP hardware remove */
snd_sof_device_remove(&pdev->dev);
--
2.20.1
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