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soundwire: amd: add pm_prepare callback and pm ops support

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Add pm_prepare callback and System level pm ops support for
AMD SoundWire manager driver.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Signed-off-by: Mastan Katragadda <Mastan.Katragadda@amd.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/lkml/20230310162554.699766-9-Vijendar.Mukunda@amd.com
Link: https://lore.kernel.org/r/20230321050901.115439-9-Vijendar.Mukunda@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Vijendar Mukunda 2023-03-21 10:39:01 +05:30 committed by Vinod Koul
parent 66c878838f
commit 9cf1efc5ed
1 changed files with 84 additions and 0 deletions
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84
drivers/soundwire/amd_manager.c
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@ -1043,6 +1043,88 @@ static int amd_sdw_clock_stop_exit(struct amd_sdw_manager *amd_manager)
return 0;
}
static int amd_resume_child_device(struct device *dev, void *data)
{
struct sdw_slave *slave = dev_to_sdw_dev(dev);
int ret;
if (!slave->probed) {
dev_dbg(dev, "skipping device, no probed driver\n");
return 0;
}
if (!slave->dev_num_sticky) {
dev_dbg(dev, "skipping device, never detected on bus\n");
return 0;
}
ret = pm_request_resume(dev);
if (ret < 0) {
dev_err(dev, "pm_request_resume failed: %d\n", ret);
return ret;
}
return 0;
}
static int __maybe_unused amd_pm_prepare(struct device *dev)
{
struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev);
struct sdw_bus *bus = &amd_manager->bus;
int ret;
if (bus->prop.hw_disabled) {
dev_dbg(bus->dev, "SoundWire manager %d is disabled, ignoring\n",
bus->link_id);
return 0;
}
/*
* When multiple peripheral devices connected over the same link, if SoundWire manager
* device is not in runtime suspend state, observed that device alerts are missing
* without pm_prepare on AMD platforms in clockstop mode0.
*/
if (amd_manager->power_mode_mask & AMD_SDW_CLK_STOP_MODE) {
ret = pm_request_resume(dev);
if (ret < 0) {
dev_err(bus->dev, "pm_request_resume failed: %d\n", ret);
return 0;
}
}
/* To force peripheral devices to system level suspend state, resume the devices
* from runtime suspend state first. Without that unable to dispatch the alert
* status to peripheral driver during system level resume as they are in runtime
* suspend state.
*/
ret = device_for_each_child(bus->dev, NULL, amd_resume_child_device);
if (ret < 0)
dev_err(dev, "amd_resume_child_device failed: %d\n", ret);
return 0;
}
static int __maybe_unused amd_suspend(struct device *dev)
{
struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev);
struct sdw_bus *bus = &amd_manager->bus;
int ret;
if (bus->prop.hw_disabled) {
dev_dbg(bus->dev, "SoundWire manager %d is disabled, ignoring\n",
bus->link_id);
return 0;
}
if (amd_manager->power_mode_mask & AMD_SDW_CLK_STOP_MODE) {
return amd_sdw_clock_stop(amd_manager);
} else if (amd_manager->power_mode_mask & AMD_SDW_POWER_OFF_MODE) {
/*
* As per hardware programming sequence on AMD platforms,
* clock stop should be invoked first before powering-off
*/
ret = amd_sdw_clock_stop(amd_manager);
if (ret)
return ret;
return amd_deinit_sdw_manager(amd_manager);
}
return 0;
}
static int __maybe_unused amd_suspend_runtime(struct device *dev)
{
struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev);
@ -1105,6 +1187,8 @@ static int __maybe_unused amd_resume_runtime(struct device *dev)
}
static const struct dev_pm_ops amd_pm = {
.prepare = amd_pm_prepare,
SET_SYSTEM_SLEEP_PM_OPS(amd_suspend, amd_resume_runtime)
SET_RUNTIME_PM_OPS(amd_suspend_runtime, amd_resume_runtime, NULL)
};