[alsa-devel] [PATCH v2 3/3] ASoC: SOF: pci: add module param to disable pm_runtime

[Pierre-Louis Bossart]

Add debug option to disable pm_runtime. This is not intended for
production devices but is very useful for platform bringup.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at 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 ab58d4f9119f..ffe485f4ba71 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_debug, sof_pci_debug, int, 0444);
+MODULE_PARM_DESC(sof_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,
@@ -213,6 +219,9 @@ 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);
@@ -333,7 +342,8 @@ 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