soundwire: qcom: add runtime pm support (74e79da9) · Commits · EulixOS / Software / Kernel

drivers/soundwire/qcom.c

+155 −1

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@
		#include <linux/of.h>
		#include <linux/of_irq.h>
		#include <linux/of_device.h>
		#include <linux/pm_runtime.h>
		#include <linux/regmap.h>
		#include <linux/slab.h>
		#include <linux/slimbus.h>
		@@ -20,6 +21,9 @@
		#include <sound/soc.h>
		#include "bus.h"

		#define SWRM_COMP_SW_RESET 0x008
		#define SWRM_COMP_STATUS 0x014
		#define SWRM_FRM_GEN_ENABLED BIT(0)
		#define SWRM_COMP_HW_VERSION 0x00
		#define SWRM_COMP_CFG_ADDR 0x04
		#define SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK BIT(1)
		@@ -29,6 +33,7 @@
		#define SWRM_COMP_PARAMS_RD_FIFO_DEPTH GENMASK(19, 15)
		#define SWRM_COMP_PARAMS_DOUT_PORTS_MASK GENMASK(4, 0)
		#define SWRM_COMP_PARAMS_DIN_PORTS_MASK GENMASK(9, 5)
		#define SWRM_COMP_MASTER_ID 0x104
		#define SWRM_INTERRUPT_STATUS 0x200
		#define SWRM_INTERRUPT_STATUS_RMSK GENMASK(16, 0)
		#define SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ BIT(0)
		@@ -111,6 +116,13 @@
		#define SWR_MAX_CMD_ID 14
		#define MAX_FIFO_RD_RETRY 3
		#define SWR_OVERFLOW_RETRY_COUNT 30
		#define SWRM_LINK_STATUS_RETRY_CNT 100

		enum {
		MASTER_ID_WSA = 1,
		MASTER_ID_RX,
		MASTER_ID_TX
		};

		struct qcom_swrm_port_config {
		u8 si;
		@@ -159,6 +171,7 @@ struct qcom_swrm_ctrl {
		u32 slave_status;
		u32 wr_fifo_depth;
		u32 rd_fifo_depth;
		bool clock_stop_not_supported;
		};

		struct qcom_swrm_data {
		@@ -497,6 +510,7 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
		u32 i;
		int devnum;
		int ret = IRQ_HANDLED;
		clk_prepare_enable(swrm->hclk);

		swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts);
		intr_sts_masked = intr_sts & swrm->intr_mask;
		@@ -604,6 +618,7 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
		intr_sts_masked = intr_sts & swrm->intr_mask;
		} while (intr_sts_masked);

		clk_disable_unprepare(swrm->hclk);
		return ret;
		}

		@@ -1017,6 +1032,15 @@ static int qcom_swrm_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *codec_dai;
		int ret, i;

		ret = pm_runtime_get_sync(ctrl->dev);
		if (ret < 0 && ret != -EACCES) {
		dev_err_ratelimited(ctrl->dev,
		"pm_runtime_get_sync failed in %s, ret %d\n",
		__func__, ret);
		pm_runtime_put_noidle(ctrl->dev);
		return ret;
		}

		sruntime = sdw_alloc_stream(dai->name);
		if (!sruntime)
		return -ENOMEM;
		@@ -1044,6 +1068,9 @@ static void qcom_swrm_shutdown(struct snd_pcm_substream *substream,

		sdw_release_stream(ctrl->sruntime[dai->id]);
		ctrl->sruntime[dai->id] = NULL;
		pm_runtime_mark_last_busy(ctrl->dev);
		pm_runtime_put_autosuspend(ctrl->dev);

		}

		static const struct snd_soc_dai_ops qcom_swrm_pdm_dai_ops = {
		@@ -1197,12 +1224,23 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
		static int swrm_reg_show(struct seq_file s_file, void data)
		{
		struct qcom_swrm_ctrl *swrm = s_file->private;
		int reg, reg_val;
		int reg, reg_val, ret;

		ret = pm_runtime_get_sync(swrm->dev);
		if (ret < 0 && ret != -EACCES) {
		dev_err_ratelimited(swrm->dev,
		"pm_runtime_get_sync failed in %s, ret %d\n",
		__func__, ret);
		pm_runtime_put_noidle(swrm->dev);
		}

		for (reg = 0; reg <= SWR_MSTR_MAX_REG_ADDR; reg += 4) {
		swrm->reg_read(swrm, reg, &reg_val);
		seq_printf(s_file, "0x%.3x: 0x%.2x\n", reg, reg_val);
		}
		pm_runtime_mark_last_busy(swrm->dev);
		pm_runtime_put_autosuspend(swrm->dev);


		return 0;
		}
		@@ -1267,6 +1305,7 @@ static int qcom_swrm_probe(struct platform_device *pdev)
		ctrl->bus.ops = &qcom_swrm_ops;
		ctrl->bus.port_ops = &qcom_swrm_port_ops;
		ctrl->bus.compute_params = &qcom_swrm_compute_params;
		ctrl->bus.clk_stop_timeout = 300;

		ret = qcom_swrm_get_port_config(ctrl);
		if (ret)
		@@ -1319,6 +1358,21 @@ static int qcom_swrm_probe(struct platform_device *pdev)
		(ctrl->version >> 24) & 0xff, (ctrl->version >> 16) & 0xff,
		ctrl->version & 0xffff);

		pm_runtime_set_autosuspend_delay(dev, 3000);
		pm_runtime_use_autosuspend(dev);
		pm_runtime_mark_last_busy(dev);
		pm_runtime_set_active(dev);
		pm_runtime_enable(dev);

		/* Clk stop is not supported on WSA Soundwire masters */
		if (ctrl->version <= 0x01030000) {
		ctrl->clock_stop_not_supported = true;
		} else {
		ctrl->reg_read(ctrl, SWRM_COMP_MASTER_ID, &val);
		if (val == MASTER_ID_WSA)
		ctrl->clock_stop_not_supported = true;
		}

		#ifdef CONFIG_DEBUG_FS
		ctrl->debugfs = debugfs_create_dir("qualcomm-sdw", ctrl->bus.debugfs);
		debugfs_create_file("qualcomm-registers", 0400, ctrl->debugfs, ctrl,
		@@ -1345,6 +1399,105 @@ static int qcom_swrm_remove(struct platform_device *pdev)
		return 0;
		}

		static bool swrm_wait_for_frame_gen_enabled(struct qcom_swrm_ctrl *swrm)
		{
		int retry = SWRM_LINK_STATUS_RETRY_CNT;
		int comp_sts;

		do {
		swrm->reg_read(swrm, SWRM_COMP_STATUS, &comp_sts);

		if (comp_sts & SWRM_FRM_GEN_ENABLED)
		return true;

		usleep_range(500, 510);
		} while (retry--);

		dev_err(swrm->dev, "%s: link status not %s\n", __func__,
		comp_sts && SWRM_FRM_GEN_ENABLED ? "connected" : "disconnected");

		return false;
		}

		static int swrm_runtime_resume(struct device *dev)
		{
		struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dev);
		int ret;

		clk_prepare_enable(ctrl->hclk);

		if (ctrl->clock_stop_not_supported) {
		reinit_completion(&ctrl->enumeration);
		ctrl->reg_write(ctrl, SWRM_COMP_SW_RESET, 0x01);
		usleep_range(100, 105);

		qcom_swrm_init(ctrl);

		usleep_range(100, 105);
		if (!swrm_wait_for_frame_gen_enabled(ctrl))
		dev_err(ctrl->dev, "link failed to connect\n");

		/* wait for hw enumeration to complete */
		wait_for_completion_timeout(&ctrl->enumeration,
		msecs_to_jiffies(TIMEOUT_MS));
		qcom_swrm_get_device_status(ctrl);
		sdw_handle_slave_status(&ctrl->bus, ctrl->status);
		} else {
		ctrl->reg_write(ctrl, SWRM_MCP_BUS_CTRL, SWRM_MCP_BUS_CLK_START);
		ctrl->reg_write(ctrl, SWRM_INTERRUPT_CLEAR,
		SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET);

		ctrl->intr_mask \|= SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET;
		ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR, ctrl->intr_mask);
		ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN, ctrl->intr_mask);

		usleep_range(100, 105);
		if (!swrm_wait_for_frame_gen_enabled(ctrl))
		dev_err(ctrl->dev, "link failed to connect\n");

		ret = sdw_bus_exit_clk_stop(&ctrl->bus);
		if (ret < 0)
		dev_err(ctrl->dev, "bus failed to exit clock stop %d\n", ret);
		}

		return 0;
		}

		static int __maybe_unused swrm_runtime_suspend(struct device *dev)
		{
		struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dev);
		int ret;

		if (!ctrl->clock_stop_not_supported) {
		/* Mask bus clash interrupt */
		ctrl->intr_mask &= ~SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET;
		ctrl->reg_write(ctrl, SWRM_INTERRUPT_MASK_ADDR, ctrl->intr_mask);
		ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN, ctrl->intr_mask);
		/* Prepare slaves for clock stop */
		ret = sdw_bus_prep_clk_stop(&ctrl->bus);
		if (ret < 0 && ret != -ENODATA) {
		dev_err(dev, "prepare clock stop failed %d", ret);
		return ret;
		}

		ret = sdw_bus_clk_stop(&ctrl->bus);
		if (ret < 0 && ret != -ENODATA) {
		dev_err(dev, "bus clock stop failed %d", ret);
		return ret;
		}
		}

		clk_disable_unprepare(ctrl->hclk);

		usleep_range(300, 305);

		return 0;
		}

		static const struct dev_pm_ops swrm_dev_pm_ops = {
		SET_RUNTIME_PM_OPS(swrm_runtime_suspend, swrm_runtime_resume, NULL)
		};

		static const struct of_device_id qcom_swrm_of_match[] = {
		{ .compatible = "qcom,soundwire-v1.3.0", .data = &swrm_v1_3_data },
		{ .compatible = "qcom,soundwire-v1.5.1", .data = &swrm_v1_5_data },
		@@ -1359,6 +1512,7 @@ static struct platform_driver qcom_swrm_driver = {
		.driver = {
		.name = "qcom-soundwire",
		.of_match_table = qcom_swrm_of_match,
		.pm = &swrm_dev_pm_ops,
		}
		};
		module_platform_driver(qcom_swrm_driver);