Implement suspend/resume capabilities (not runtime_pm for now) The resume part is essentially a full-blown re-enumeration.
When S0ix is supported, we will select clock stop mode when the ACPI target state is S0, and tear down the link for S3.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- drivers/soundwire/intel.c | 75 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 00fa5c3a6c1f..c15596c011de 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1253,10 +1253,85 @@ static int intel_master_remove(struct sdw_master_device *md) return 0; }
+/* + * PM calls + */ + +#ifdef CONFIG_PM + +static int intel_suspend(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + int ret; + + if (cdns->bus.prop.hw_disabled) { + dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n", + cdns->bus.link_id); + return 0; + } + + ret = sdw_cdns_enable_interrupt(cdns, false); + if (ret < 0) { + dev_err(dev, "cannot disable interrupts on suspend\n"); + return ret; + } + + ret = intel_link_power_down(sdw); + if (ret) { + dev_err(dev, "Link power down failed: %d", ret); + return ret; + } + + intel_shim_wake(sdw, false); + + return 0; +} + +static int intel_resume(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + int ret; + + if (cdns->bus.prop.hw_disabled) { + dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n", + cdns->bus.link_id); + return 0; + } + + ret = intel_init(sdw); + if (ret) { + dev_err(dev, "%s failed: %d", __func__, ret); + return ret; + } + + ret = sdw_cdns_enable_interrupt(cdns, true); + if (ret < 0) { + dev_err(dev, "cannot enable interrupts during resume\n"); + return ret; + } + + ret = sdw_cdns_exit_reset(cdns); + if (ret < 0) { + dev_err(dev, "unable to exit bus reset sequence during resume\n"); + return ret; + } + + return ret; +} + +#endif + +static const struct dev_pm_ops intel_pm = { + SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) +}; + struct sdw_md_driver intel_sdw_driver = { .driver = { .name = "intel-sdw", .owner = THIS_MODULE, + .pm = &intel_pm, }, .probe = intel_master_probe, .startup = intel_master_startup,