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 --- drivers/soundwire/amd_manager.c | 90 +++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+)

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c index e53dc67f8529..350d411e695d 100644 --- a/drivers/soundwire/amd_manager.c +++ b/drivers/soundwire/amd_manager.c @@ -1157,6 +1157,94 @@ 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) +{ + int ret; + struct sdw_slave *slave = dev_to_sdw_dev(dev); + + 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; + } + + if (!pm_runtime_suspended(dev)) + return 0; + ret = pm_request_resume(dev); + if (ret < 0) + dev_err(dev, "%s: pm_request_resume failed: %d\n", __func__, ret); + + return ret; +} + +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 (pm_runtime_suspended(dev) && 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, "%s: amd_resume_child_device failed: %d\n", __func__, 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) { + ret = amd_sdw_clock_stop(amd_manager); + if (ret) + return ret; + } 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; + ret = amd_deinit_sdw_manager(amd_manager); + if (ret) + return ret; + } + return 0; +} + static int __maybe_unused amd_suspend_runtime(struct device *dev) { struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev); @@ -1229,6 +1317,8 @@ 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) };