diff mbox series

[V2,6/8] soundwire: amd: add runtime pm ops for AMD soundwire manager driver

Message ID 20230213094031.2231058-7-Vijendar.Mukunda@amd.com
State Superseded
Headers show
Series [V2,1/8] soundwire: export sdw_compute_slave_ports() function | expand

Commit Message

Vijendar Mukunda Feb. 13, 2023, 9:40 a.m. UTC 
Add support for runtime pm ops 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   | 163 ++++++++++++++++++++++++++++++
 drivers/soundwire/amd_manager.h   |   3 +
 include/linux/soundwire/sdw_amd.h |  16 +++
 3 files changed, 182 insertions(+)

Comments

Vijendar Mukunda Feb. 14, 2023, 6:13 a.m. UTC | #1 
On 13/02/23 23:50, Pierre-Louis Bossart wrote:
>
> On 2/13/23 03:40, Vijendar Mukunda wrote:
>> Add support for runtime pm ops 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   | 163 ++++++++++++++++++++++++++++++
>>  drivers/soundwire/amd_manager.h   |   3 +
>>  include/linux/soundwire/sdw_amd.h |  16 +++
>>  3 files changed, 182 insertions(+)
>>
>> diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
>> index 87f9a987d93a..eced189ba6e0 100644
>> --- a/drivers/soundwire/amd_manager.c
>> +++ b/drivers/soundwire/amd_manager.c
>> @@ -14,6 +14,7 @@
>>  #include <linux/slab.h>
>>  #include <linux/soundwire/sdw.h>
>>  #include <linux/soundwire/sdw_registers.h>
>> +#include <linux/pm_runtime.h>
>>  #include <linux/wait.h>
>>  #include <sound/pcm_params.h>
>>  #include <sound/soc.h>
>> @@ -185,6 +186,15 @@ static void amd_disable_sdw_interrupts(struct amd_sdw_manager *amd_manager)
>>  	acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_ERROR_INTR_MASK);
>>  }
>>  
>> +static int amd_deinit_sdw_manager(struct amd_sdw_manager *amd_manager)
>> +{
>> +	int ret;
>> +
>> +	amd_disable_sdw_interrupts(amd_manager);
>> +	ret = amd_disable_sdw_manager(amd_manager);
>> +	return ret;
>> +}
>> +
>>  static void amd_sdw_set_frameshape(struct amd_sdw_manager *amd_manager)
>>  {
>>  	u32 frame_size;
>> @@ -1043,6 +1053,12 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
>>  	INIT_WORK(&amd_manager->amd_sdw_work, amd_sdw_update_slave_status_work);
>>  	INIT_WORK(&amd_manager->probe_work, amd_sdw_probe_work);
>>  	schedule_work(&amd_manager->probe_work);
>> +	/* Enable runtime PM */
>> +	pm_runtime_set_autosuspend_delay(dev, AMD_SDW_MASTER_SUSPEND_DELAY_MS);
>> +	pm_runtime_use_autosuspend(dev);
>> +	pm_runtime_mark_last_busy(dev);
>> +	pm_runtime_set_active(dev);
>> +	pm_runtime_enable(dev);
> that doesn't sound good to me, why do this here and not in the work
> function? That creates a racy case where the device might suspend before
> being initialized.
This can be moved to work function.
>
>>  	return 0;
>>  }
>>  
>> @@ -1057,14 +1073,161 @@ static int amd_sdw_manager_remove(struct platform_device *pdev)
>>  	amd_disable_sdw_interrupts(amd_manager);
>>  	sdw_bus_master_delete(&amd_manager->bus);
>>  	ret = amd_disable_sdw_manager(amd_manager);
>> +	pm_runtime_disable(&pdev->dev);
> shouldn't you do the pm_runtime_disable first?
I agree. Will fix it.
>
>>  	return ret;
>>  }
>> +/* AMD pm_runtime quirk definitions */
>> +
>> +/*
>> + * Force the clock to stop(ClockStopMode0) when suspend callback
>> + * is invoked.
>> + */
>> +#define AMD_SDW_CLK_STOP_MODE		1
>> +
>> +/*
>> + * Stop the bus when runtime suspend/system level suspend callback
>> + * is invoked. If set, a complete bus reset and re-enumeration will
>> + * be performed when the bus restarts.
>> + */
>> +#define AMD_SDW_POWER_OFF_MODE		2
> You need to clarify this mode, can you deal with device in-band wakes if
> the power is off?
On the Current platform, in-band wakes are not supported if the power is off.


>
>>  #define ACP_SDW0	0
>>  #define ACP_SDW1	1
>>  
>> @@ -57,6 +71,7 @@ struct sdw_amd_dai_runtime {
>>   * @instance: soundwire manager instance
>>   * @quirks: soundwire manager quirks
>>   * @wake_en_mask: wake enable mask per soundwire manager
>> + * @clk_stopped: flag set to true when clock is stopped
>>   * @power_mode_mask: flag interprets amd soundwire manager power mode
>>   * @dai_runtime_array: dai runtime array
>>   */
>> @@ -86,6 +101,7 @@ struct amd_sdw_manager {
>>  	u32 quirks;
>>  	u32 wake_en_mask;
>>  	u32 power_mode_mask;
>> +	bool clk_stopped;
>>  
>>  	struct sdw_amd_dai_runtime **dai_runtime_array;
>>  };
Pierre-Louis Bossart Feb. 14, 2023, 1:33 p.m. UTC | #2 
>>> +/* AMD pm_runtime quirk definitions */
>>> +
>>> +/*
>>> + * Force the clock to stop(ClockStopMode0) when suspend callback
>>> + * is invoked.
>>> + */
>>> +#define AMD_SDW_CLK_STOP_MODE		1
>>> +
>>> +/*
>>> + * Stop the bus when runtime suspend/system level suspend callback
>>> + * is invoked. If set, a complete bus reset and re-enumeration will
>>> + * be performed when the bus restarts.
>>> + */
>>> +#define AMD_SDW_POWER_OFF_MODE		2
>> You need to clarify this mode, can you deal with device in-band wakes if
>> the power is off?
> On the Current platform, in-band wakes are not supported if the power is off.

Humm, that's an important clarification.

Does this mean your link0 will never use the POWER_OFF_MODE since it
includes support for headset codecs and you want the ability to detect
jacks status changes?

Or is this more like CLK_STOP_MODE is used in runtime pm and POWER_OFF
in system suspend?
Vijendar Mukunda Feb. 14, 2023, 9:44 p.m. UTC | #3 
On 14/02/23 19:03, Pierre-Louis Bossart wrote:
>
>>>> +/* AMD pm_runtime quirk definitions */
>>>> +
>>>> +/*
>>>> + * Force the clock to stop(ClockStopMode0) when suspend callback
>>>> + * is invoked.
>>>> + */
>>>> +#define AMD_SDW_CLK_STOP_MODE		1
>>>> +
>>>> +/*
>>>> + * Stop the bus when runtime suspend/system level suspend callback
>>>> + * is invoked. If set, a complete bus reset and re-enumeration will
>>>> + * be performed when the bus restarts.
>>>> + */
>>>> +#define AMD_SDW_POWER_OFF_MODE		2
>>> You need to clarify this mode, can you deal with device in-band wakes if
>>> the power is off?
>> On the Current platform, in-band wakes are not supported if the power is off.
> Humm, that's an important clarification.
>
> Does this mean your link0 will never use the POWER_OFF_MODE since it
> includes support for headset codecs and you want the ability to detect
> jacks status changes?
Yes. we will use CLK_STOP_MODE in runtime pm and system suspend
for Link0 when jack codec is connected over Link 0.
>
> Or is this more like CLK_STOP_MODE is used in runtime pm and POWER_OFF
> in system suspend?
diff mbox series

Patch

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index 87f9a987d93a..eced189ba6e0 100644
--- a/drivers/soundwire/amd_manager.c
+++ b/drivers/soundwire/amd_manager.c
@@ -14,6 +14,7 @@ 
 #include <linux/slab.h>
 #include <linux/soundwire/sdw.h>
 #include <linux/soundwire/sdw_registers.h>
+#include <linux/pm_runtime.h>
 #include <linux/wait.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -185,6 +186,15 @@  static void amd_disable_sdw_interrupts(struct amd_sdw_manager *amd_manager)
 	acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_ERROR_INTR_MASK);
 }
 
+static int amd_deinit_sdw_manager(struct amd_sdw_manager *amd_manager)
+{
+	int ret;
+
+	amd_disable_sdw_interrupts(amd_manager);
+	ret = amd_disable_sdw_manager(amd_manager);
+	return ret;
+}
+
 static void amd_sdw_set_frameshape(struct amd_sdw_manager *amd_manager)
 {
 	u32 frame_size;
@@ -1043,6 +1053,12 @@  static int amd_sdw_manager_probe(struct platform_device *pdev)
 	INIT_WORK(&amd_manager->amd_sdw_work, amd_sdw_update_slave_status_work);
 	INIT_WORK(&amd_manager->probe_work, amd_sdw_probe_work);
 	schedule_work(&amd_manager->probe_work);
+	/* Enable runtime PM */
+	pm_runtime_set_autosuspend_delay(dev, AMD_SDW_MASTER_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
 	return 0;
 }
 
@@ -1057,14 +1073,161 @@  static int amd_sdw_manager_remove(struct platform_device *pdev)
 	amd_disable_sdw_interrupts(amd_manager);
 	sdw_bus_master_delete(&amd_manager->bus);
 	ret = amd_disable_sdw_manager(amd_manager);
+	pm_runtime_disable(&pdev->dev);
 	return ret;
 }
 
+static int amd_sdw_clock_stop(struct amd_sdw_manager *amd_manager)
+{
+	u32 val;
+	u32 retry_count = 0;
+	int ret;
+
+	ret = sdw_bus_prep_clk_stop(&amd_manager->bus);
+	if (ret < 0 && ret != -ENODATA) {
+		dev_err(amd_manager->dev, "prepare clock stop failed %d", ret);
+		return 0;
+	}
+	ret = sdw_bus_clk_stop(&amd_manager->bus);
+	if (ret < 0 && ret != -ENODATA) {
+		dev_err(amd_manager->dev, "bus clock stop failed %d", ret);
+		return 0;
+	}
+
+	do {
+		val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+		if (val & AMD_SDW_CLK_STOP_DONE) {
+			amd_manager->clk_stopped = true;
+			break;
+		}
+	} while (retry_count++ < AMD_SDW_CLK_STOP_MAX_RETRY_COUNT);
+
+	if (!amd_manager->clk_stopped) {
+		dev_err(amd_manager->dev, "SDW%x clock stop failed\n", amd_manager->instance);
+		return 0;
+	}
+
+	if (amd_manager->wake_en_mask)
+		acp_reg_writel(0x01, amd_manager->acp_mmio + ACP_SW_WAKE_EN(amd_manager->instance));
+
+	dev_dbg(amd_manager->dev, "SDW%x clock stop successful\n", amd_manager->instance);
+	return 0;
+}
+
+static int amd_sdw_clock_stop_exit(struct amd_sdw_manager *amd_manager)
+{
+	int ret;
+	u32 val = 0;
+	u32 retry_count = 0;
+
+	if (amd_manager->clk_stopped) {
+		val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+		val |= AMD_SDW_CLK_RESUME_REQ;
+		acp_reg_writel(val, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+		do {
+			val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+			if (val & AMD_SDW_CLK_RESUME_DONE)
+				break;
+			usleep_range(10, 100);
+		} while (retry_count++ < AMD_SDW_CLK_STOP_MAX_RETRY_COUNT);
+		if (val & AMD_SDW_CLK_RESUME_DONE) {
+			acp_reg_writel(0, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+			ret = sdw_bus_exit_clk_stop(&amd_manager->bus);
+			if (ret < 0)
+				dev_err(amd_manager->dev, "bus failed to exit clock stop %d\n",
+					ret);
+			amd_manager->clk_stopped = false;
+		}
+	}
+	if (amd_manager->clk_stopped) {
+		dev_err(amd_manager->dev, "SDW%x clock stop exit failed\n", amd_manager->instance);
+		return 0;
+	}
+	dev_dbg(amd_manager->dev, "SDW%x clock stop exit successful\n", amd_manager->instance);
+	return 0;
+}
+
+static int __maybe_unused amd_suspend_runtime(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,\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) {
+		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_resume_runtime(struct device *dev)
+{
+	struct amd_sdw_manager *amd_manager = dev_get_drvdata(dev);
+	struct sdw_bus *bus = &amd_manager->bus;
+	int ret;
+	u32 val = 0;
+	u32 retry_count = 0;
+
+	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_exit(amd_manager);
+		if (ret)
+			return ret;
+	} else if (amd_manager->power_mode_mask & AMD_SDW_POWER_OFF_MODE) {
+		val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+		if (val) {
+			val |= AMD_SDW_CLK_RESUME_REQ;
+			acp_reg_writel(val, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+			do {
+				val = acp_reg_readl(amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+				if (val & AMD_SDW_CLK_RESUME_DONE)
+					break;
+				usleep_range(10, 100);
+			} while (retry_count++ < AMD_SDW_CLK_STOP_MAX_RETRY_COUNT);
+			if (val & AMD_SDW_CLK_RESUME_DONE) {
+				acp_reg_writel(0, amd_manager->mmio + ACP_SW_CLK_RESUME_CTRL);
+				amd_manager->clk_stopped = false;
+			}
+		}
+		sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
+		amd_init_sdw_manager(amd_manager);
+		amd_enable_sdw_interrupts(amd_manager);
+		ret = amd_enable_sdw_manager(amd_manager);
+		if (ret)
+			return ret;
+		amd_sdw_set_frameshape(amd_manager);
+	}
+	return 0;
+}
+
+static const struct dev_pm_ops amd_pm = {
+	SET_RUNTIME_PM_OPS(amd_suspend_runtime, amd_resume_runtime, NULL)
+};
+
 static struct platform_driver amd_sdw_driver = {
 	.probe	= &amd_sdw_manager_probe,
 	.remove = &amd_sdw_manager_remove,
 	.driver = {
 		.name	= "amd_sdw_manager",
+		.pm = &amd_pm,
 	}
 };
 module_platform_driver(amd_sdw_driver);
diff --git a/drivers/soundwire/amd_manager.h b/drivers/soundwire/amd_manager.h
index 5bcaf7a763bb..6ec37612ae4e 100644
--- a/drivers/soundwire/amd_manager.h
+++ b/drivers/soundwire/amd_manager.h
@@ -187,6 +187,9 @@ 
 #define AMD_SDW0_PAD_KEEPER_DISABLE_MASK		0x1E
 #define AMD_SDW1_PAD_KEEPER_DISABLE_MASK		0xF
 #define AMD_SDW_PREQ_INTR_STAT				BIT(19)
+#define AMD_SDW_CLK_STOP_DONE				1
+#define AMD_SDW_CLK_RESUME_REQ				2
+#define AMD_SDW_CLK_RESUME_DONE				3
 
 enum amd_sdw_cmd_type {
 	AMD_SDW_CMD_PING = 0,
diff --git a/include/linux/soundwire/sdw_amd.h b/include/linux/soundwire/sdw_amd.h
index 003b8a197fc5..9074c7736ff7 100644
--- a/include/linux/soundwire/sdw_amd.h
+++ b/include/linux/soundwire/sdw_amd.h
@@ -8,6 +8,20 @@ 
 
 #include <linux/soundwire/sdw.h>
 
+/* AMD pm_runtime quirk definitions */
+
+/*
+ * Force the clock to stop(ClockStopMode0) when suspend callback
+ * is invoked.
+ */
+#define AMD_SDW_CLK_STOP_MODE		1
+
+/*
+ * Stop the bus when runtime suspend/system level suspend callback
+ * is invoked. If set, a complete bus reset and re-enumeration will
+ * be performed when the bus restarts.
+ */
+#define AMD_SDW_POWER_OFF_MODE		2
 #define ACP_SDW0	0
 #define ACP_SDW1	1
 
@@ -57,6 +71,7 @@  struct sdw_amd_dai_runtime {
  * @instance: soundwire manager instance
  * @quirks: soundwire manager quirks
  * @wake_en_mask: wake enable mask per soundwire manager
+ * @clk_stopped: flag set to true when clock is stopped
  * @power_mode_mask: flag interprets amd soundwire manager power mode
  * @dai_runtime_array: dai runtime array
  */
@@ -86,6 +101,7 @@  struct amd_sdw_manager {
 	u32 quirks;
 	u32 wake_en_mask;
 	u32 power_mode_mask;
+	bool clk_stopped;
 
 	struct sdw_amd_dai_runtime **dai_runtime_array;
 };