i3c: master: svc: add runtime pm support (05be23ef) · Commits · EulixOS / Software / Kernel

drivers/i3c/master/svc-i3c-master.c

+156 −40

Original line number	Diff line number	Diff line
		@@ -17,7 +17,9 @@
		#include <linux/list.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/pinctrl/consumer.h>
		#include <linux/platform_device.h>
		#include <linux/pm_runtime.h>

		/* Master Mode Registers */
		#define SVC_I3C_MCONFIG 0x000
		@@ -119,6 +121,7 @@
		#define SVC_MDYNADDR_ADDR(x) FIELD_PREP(GENMASK(7, 1), (x))

		#define SVC_I3C_MAX_DEVS 32
		#define SVC_I3C_PM_TIMEOUT_MS 1000

		/* This parameter depends on the implementation and may be tuned */
		#define SVC_I3C_FIFO_SIZE 16
		@@ -480,10 +483,20 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m)
		u32 ppbaud, pplow, odhpp, odbaud, odstop, i2cbaud, reg;
		int ret;

		ret = pm_runtime_resume_and_get(master->dev);
		if (ret < 0) {
		dev_err(master->dev,
		"<%s> cannot resume i3c bus master, err: %d\n",
		__func__, ret);
		return ret;
		}

		/* Timings derivation */
		fclk_rate = clk_get_rate(master->fclk);
		if (!fclk_rate)
		return -EINVAL;
		if (!fclk_rate) {
		ret = -EINVAL;
		goto rpm_out;
		}

		fclk_period_ns = DIV_ROUND_UP(1000000000, fclk_rate);

		@@ -527,7 +540,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m)
		odstop = 1;
		break;
		default:
		return -EINVAL;
		goto rpm_out;
		}

		reg = SVC_I3C_MCONFIG_MASTER_EN \|
		@@ -545,7 +558,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m)
		/* Master core's registration */
		ret = i3c_master_get_free_addr(m, 0);
		if (ret < 0)
		return ret;
		goto rpm_out;

		info.dyn_addr = ret;

		@@ -554,21 +567,35 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m)

		ret = i3c_master_set_info(&master->base, &info);
		if (ret)
		return ret;
		goto rpm_out;

		svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);

		return 0;
		rpm_out:
		pm_runtime_mark_last_busy(master->dev);
		pm_runtime_put_autosuspend(master->dev);

		return ret;
		}

		static void svc_i3c_master_bus_cleanup(struct i3c_master_controller *m)
		{
		struct svc_i3c_master *master = to_svc_i3c_master(m);
		int ret;

		ret = pm_runtime_resume_and_get(master->dev);
		if (ret < 0) {
		dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__);
		return;
		}

		svc_i3c_master_disable_interrupts(master);

		/* Disable master */
		writel(0, master->regs + SVC_I3C_MCONFIG);

		pm_runtime_mark_last_busy(master->dev);
		pm_runtime_put_autosuspend(master->dev);
		}

		static int svc_i3c_master_reserve_slot(struct svc_i3c_master *master)
		@@ -867,31 +894,36 @@ static int svc_i3c_master_do_daa(struct i3c_master_controller *m)
		unsigned int dev_nb;
		int ret, i;

		ret = pm_runtime_resume_and_get(master->dev);
		if (ret < 0) {
		dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__);
		return ret;
		}

		spin_lock_irqsave(&master->xferqueue.lock, flags);
		ret = svc_i3c_master_do_daa_locked(master, addrs, &dev_nb);
		spin_unlock_irqrestore(&master->xferqueue.lock, flags);
		if (ret)
		goto emit_stop;
		if (ret) {
		svc_i3c_master_emit_stop(master);
		svc_i3c_master_clear_merrwarn(master);
		goto rpm_out;
		}

		/* Register all devices who participated to the core */
		for (i = 0; i < dev_nb; i++) {
		ret = i3c_master_add_i3c_dev_locked(m, addrs[i]);
		if (ret)
		return ret;
		goto rpm_out;
		}

		/* Configure IBI auto-rules */
		ret = svc_i3c_update_ibirules(master);
		if (ret) {
		if (ret)
		dev_err(master->dev, "Cannot handle such a list of devices");
		return ret;
		}

		return 0;

		emit_stop:
		svc_i3c_master_emit_stop(master);
		svc_i3c_master_clear_merrwarn(master);
		rpm_out:
		pm_runtime_mark_last_busy(master->dev);
		pm_runtime_put_autosuspend(master->dev);

		return ret;
		}
		@@ -1060,6 +1092,12 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
		if (!xfer)
		return;

		ret = pm_runtime_resume_and_get(master->dev);
		if (ret < 0) {
		dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__);
		return;
		}

		svc_i3c_master_clear_merrwarn(master);
		svc_i3c_master_flush_fifo(master);

		@@ -1074,6 +1112,9 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
		break;
		}

		pm_runtime_mark_last_busy(master->dev);
		pm_runtime_put_autosuspend(master->dev);

		xfer->ret = ret;
		complete(&xfer->comp);

		@@ -1350,6 +1391,14 @@ static void svc_i3c_master_free_ibi(struct i3c_dev_desc *dev)
		static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
		{
		struct i3c_master_controller *m = i3c_dev_get_master(dev);
		struct svc_i3c_master *master = to_svc_i3c_master(m);
		int ret;

		ret = pm_runtime_resume_and_get(master->dev);
		if (ret < 0) {
		dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__);
		return ret;
		}

		return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
		}
		@@ -1357,8 +1406,15 @@ static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
		static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
		{
		struct i3c_master_controller *m = i3c_dev_get_master(dev);
		struct svc_i3c_master *master = to_svc_i3c_master(m);
		int ret;

		ret = i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);

		return i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
		pm_runtime_mark_last_busy(master->dev);
		pm_runtime_put_autosuspend(master->dev);

		return ret;
		}

		static void svc_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev,
		@@ -1389,6 +1445,37 @@ static const struct i3c_master_controller_ops svc_i3c_master_ops = {
		.disable_ibi = svc_i3c_master_disable_ibi,
		};

		static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master)
		{
		int ret = 0;

		ret = clk_prepare_enable(master->pclk);
		if (ret)
		return ret;

		ret = clk_prepare_enable(master->fclk);
		if (ret) {
		clk_disable_unprepare(master->pclk);
		return ret;
		}

		ret = clk_prepare_enable(master->sclk);
		if (ret) {
		clk_disable_unprepare(master->pclk);
		clk_disable_unprepare(master->fclk);
		return ret;
		}

		return 0;
		}

		static void svc_i3c_master_unprepare_clks(struct svc_i3c_master *master)
		{
		clk_disable_unprepare(master->pclk);
		clk_disable_unprepare(master->fclk);
		clk_disable_unprepare(master->sclk);
		}

		static int svc_i3c_master_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		@@ -1421,24 +1508,16 @@ static int svc_i3c_master_probe(struct platform_device *pdev)

		master->dev = dev;

		ret = clk_prepare_enable(master->pclk);
		ret = svc_i3c_master_prepare_clks(master);
		if (ret)
		return ret;

		ret = clk_prepare_enable(master->fclk);
		if (ret)
		goto err_disable_pclk;

		ret = clk_prepare_enable(master->sclk);
		if (ret)
		goto err_disable_fclk;

		INIT_WORK(&master->hj_work, svc_i3c_master_hj_work);
		INIT_WORK(&master->ibi_work, svc_i3c_master_ibi_work);
		ret = devm_request_irq(dev, master->irq, svc_i3c_master_irq_handler,
		IRQF_NO_SUSPEND, "svc-i3c-irq", master);
		if (ret)
		goto err_disable_sclk;
		goto err_disable_clks;

		master->free_slots = GENMASK(SVC_I3C_MAX_DEVS - 1, 0);

		@@ -1452,29 +1531,38 @@ static int svc_i3c_master_probe(struct platform_device *pdev)
		GFP_KERNEL);
		if (!master->ibi.slots) {
		ret = -ENOMEM;
		goto err_disable_sclk;
		goto err_disable_clks;
		}

		platform_set_drvdata(pdev, master);

		pm_runtime_set_autosuspend_delay(&pdev->dev, SVC_I3C_PM_TIMEOUT_MS);
		pm_runtime_use_autosuspend(&pdev->dev);
		pm_runtime_get_noresume(&pdev->dev);
		pm_runtime_set_active(&pdev->dev);
		pm_runtime_enable(&pdev->dev);

		svc_i3c_master_reset(master);

		/* Register the master */
		ret = i3c_master_register(&master->base, &pdev->dev,
		&svc_i3c_master_ops, false);
		if (ret)
		goto err_disable_sclk;
		goto rpm_disable;

		return 0;
		pm_runtime_mark_last_busy(&pdev->dev);
		pm_runtime_put_autosuspend(&pdev->dev);

		err_disable_sclk:
		clk_disable_unprepare(master->sclk);
		return 0;

		err_disable_fclk:
		clk_disable_unprepare(master->fclk);
		rpm_disable:
		pm_runtime_dont_use_autosuspend(&pdev->dev);
		pm_runtime_put_noidle(&pdev->dev);
		pm_runtime_set_suspended(&pdev->dev);
		pm_runtime_disable(&pdev->dev);

		err_disable_pclk:
		clk_disable_unprepare(master->pclk);
		err_disable_clks:
		svc_i3c_master_unprepare_clks(master);

		return ret;
		}
		@@ -1488,13 +1576,40 @@ static int svc_i3c_master_remove(struct platform_device *pdev)
		if (ret)
		return ret;

		clk_disable_unprepare(master->pclk);
		clk_disable_unprepare(master->fclk);
		clk_disable_unprepare(master->sclk);
		pm_runtime_dont_use_autosuspend(&pdev->dev);
		pm_runtime_disable(&pdev->dev);

		return 0;
		}

		static int __maybe_unused svc_i3c_runtime_suspend(struct device *dev)
		{
		struct svc_i3c_master *master = dev_get_drvdata(dev);

		svc_i3c_master_unprepare_clks(master);
		pinctrl_pm_select_sleep_state(dev);

		return 0;
		}

		static int __maybe_unused svc_i3c_runtime_resume(struct device *dev)
		{
		struct svc_i3c_master *master = dev_get_drvdata(dev);
		int ret = 0;

		pinctrl_pm_select_default_state(dev);
		svc_i3c_master_prepare_clks(master);

		return ret;
		}

		static const struct dev_pm_ops svc_i3c_pm_ops = {
		SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
		pm_runtime_force_resume)
		SET_RUNTIME_PM_OPS(svc_i3c_runtime_suspend,
		svc_i3c_runtime_resume, NULL)
		};

		static const struct of_device_id svc_i3c_master_of_match_tbl[] = {
		{ .compatible = "silvaco,i3c-master" },
		{ /* sentinel */ },
		@@ -1506,6 +1621,7 @@ static struct platform_driver svc_i3c_master = {
		.driver = {
		.name = "silvaco-i3c-master",
		.of_match_table = svc_i3c_master_of_match_tbl,
		.pm = &svc_i3c_pm_ops,
		},
		};
		module_platform_driver(svc_i3c_master);