diff mbox series

[V3,8/8] soundwire: amd: add pm_prepare callback and pm ops support

Message ID 20230220100418.76754-9-Vijendar.Mukunda@amd.com
State Superseded
Headers show
Series Add SoundWire support for AMD platforms | expand

Commit Message

Vijendar Mukunda Feb. 20, 2023, 10:04 a.m. UTC 
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 | 89 +++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

Comments

Pierre-Louis Bossart Feb. 21, 2023, 4:24 p.m. UTC | #1 
> +static int amd_resume_child_device(struct device *dev, void *data)
> +{
> +	int ret;
> +	struct sdw_slave *slave = dev_to_sdw_dev(dev);

style: invert two lines?

> +
> +	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);

why not resume unconditionally and let the pm_runtime framework figure
things out?

That's what we did for Intel...

> +	if (ret < 0)
> +		dev_err(dev, "pm_request_resume failed: %d\n", 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);

same, why not simplify and use:

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) {
> +		ret = amd_sdw_clock_stop(amd_manager);
> +		if (ret)
> +			return ret;

you could do a 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;
> +		ret = amd_deinit_sdw_manager(amd_manager);
> +		if (ret)
> +			return ret;
> +	}
> +	return 0;
> +}
diff mbox series

Patch

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index a7182aa78652..b974e52248da 100644
--- a/drivers/soundwire/amd_manager.c
+++ b/drivers/soundwire/amd_manager.c
@@ -1155,6 +1155,93 @@  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, "pm_request_resume failed: %d\n", 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, "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) {
+		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);
@@ -1227,6 +1314,8 @@  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)
 };