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ASoC: SOF: pci: add debug module param

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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>
Link: https://lore.kernel.org/r/20191008164443.1358-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2019-10-08 11:44:38 -05:00 committed by Mark Brown
parent 70b0c75ae1
commit 8b160dc2a9
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 1 deletions
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12
sound/soc/sof/sof-pci-dev.c
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@ -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);