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soundwire: intel: Add basic power management support 

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>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200721203723.18305-2-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-07-22 04:37:11 +08:00 committed by Vinod Koul
parent bd84256e86
commit 9b3b4b3f2f
1 changed files with 79 additions and 2 deletions
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81
drivers/soundwire/intel.c
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@ -463,7 +463,7 @@ static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable)
mutex_unlock(sdw->link_res->shim_lock);
}
static int __maybe_unused intel_link_power_down(struct sdw_intel *sdw)
static int intel_link_power_down(struct sdw_intel *sdw)
{
int link_control, spa_mask, cpa_mask;
unsigned int link_id = sdw->instance;
@ -1376,12 +1376,89 @@ int intel_master_process_wakeen_event(struct platform_device *pdev)
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);
struct sdw_bus *bus = &cdns->bus;
int ret;
if (bus->prop.hw_disabled) {
dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
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);
struct sdw_bus *bus = &cdns->bus;
int ret;
if (bus->prop.hw_disabled) {
dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
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)
};
static struct platform_driver sdw_intel_drv = {
.probe = intel_master_probe,
.remove = intel_master_remove,
.driver = {
.name = "intel-sdw",
},
.pm = &intel_pm,
}
};
module_platform_driver(sdw_intel_drv);