[PATCH V3 6/8] soundwire: amd: add runtime pm ops for AMD SoundWire manager driver

Vijendar Mukunda
2023-02-20T10:05:14Z

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 | 17 ++++
3 files changed, 183 insertions(+)

diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
index 5d9f0a9b2dfd..3322adeca0d8 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;
@@ -964,6 +974,12 @@ static void amd_sdw_probe_work(struct work_struct *work)
return;
amd_sdw_set_frameshape(amd_manager);
}
+ /* Enable runtime PM */
+ pm_runtime_set_autosuspend_delay(amd_manager->dev, AMD_SDW_MASTER_SUSPEND_DELAY_MS);
+ pm_runtime_use_autosuspend(amd_manager->dev);
+ pm_runtime_mark_last_busy(amd_manager->dev);
+ pm_runtime_set_active(amd_manager->dev);
+ pm_runtime_enable(amd_manager->dev);
}

static int amd_sdw_manager_probe(struct platform_device *pdev)
@@ -1052,17 +1068,164 @@ static int amd_sdw_manager_remove(struct platform_device *pdev)
{
struct amd_sdw_manager *amd_manager = dev_get_drvdata(&pdev->dev);

+ pm_runtime_disable(&pdev->dev);
cancel_work_sync(&amd_manager->probe_work);
amd_disable_sdw_interrupts(amd_manager);
sdw_bus_master_delete(&amd_manager->bus);
return amd_disable_sdw_manager(amd_manager);
}

+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;
+ 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;
+ 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 6d1007e96a1e..fd9b1a443a4e 100644
--- a/include/linux/soundwire/sdw_amd.h
+++ b/include/linux/soundwire/sdw_amd.h
@@ -8,6 +8,21 @@

#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. In-band wake interrupts are
+ * not supported in this mode.
+ */
+#define AMD_SDW_POWER_OFF_MODE 2
#define ACP_SDW0 0
#define ACP_SDW1 1

@@ -56,6 +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
*/
@@ -85,6 +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;
};
--
2.34.1