Add debug parameter for snd-sof-pci.
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-pci-dev.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/sound/soc/sof/sof-pci-dev.c b/sound/soc/sof/sof-pci-dev.c
index d66412a77873..030f2cb06921 100644
--- a/sound/soc/sof/sof-pci-dev.c
+++ b/sound/soc/sof/sof-pci-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_pci_debug;
+module_param_named(sof_pci_debug, sof_pci_debug, int, 0444);
+MODULE_PARM_DESC(sof_pci_debug, "SOF PCI debug options (0x0 all off)");
+
+#define SOF_PCI_DISABLE_PM_RUNTIME BIT(0)
+
#if IS_ENABLED(CONFIG_SND_SOC_SOF_APOLLOLAKE)
static const struct sof_dev_desc bxt_desc = {
.machines = snd_soc_acpi_intel_bxt_machines,
@@ -249,6 +255,9 @@ static void sof_pci_probe_complete(struct device *dev)
{
dev_dbg(dev, "Completing SOF PCI probe");
+ if (sof_pci_debug & SOF_PCI_DISABLE_PM_RUNTIME)
+ return;
+
/* allow runtime_pm */
pm_runtime_set_autosuspend_delay(dev, SND_SOF_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(dev);
@@ -370,7 +379,8 @@ static void sof_pci_remove(struct pci_dev *pci)
snd_sof_device_remove(&pci->dev);
/* follow recommendation in pci-driver.c to increment usage counter */
- pm_runtime_get_noresume(&pci->dev);
+ if (!(sof_pci_debug & SOF_PCI_DISABLE_PM_RUNTIME))
+ pm_runtime_get_noresume(&pci->dev);
/* release pci regions and disable device */
pci_release_regions(pci);
--
2.20.1
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