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@linux.intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- 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);