1 files changed, 112 insertions, 31 deletions

diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index 465de2c800f2..95c88f929f27 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/phy/omap_control_phy.h>
 #include <linux/of_platform.h>
+#include <linux/spinlock.h>
 
 #define	PLL_STATUS		0x00000004
 #define	PLL_GO			0x00000008
@@ -82,6 +83,10 @@ struct ti_pipe3 {
 	struct clk		*refclk;
 	struct clk		*div_clk;
 	struct pipe3_dpll_map	*dpll_map;
+	bool			enabled;
+	spinlock_t		lock;	/* serialize clock enable/disable */
+	/* the below flag is needed specifically for SATA */
+	bool			refclk_enabled;
 };
 
 static struct pipe3_dpll_map dpll_map_usb[] = {
@@ -307,6 +312,7 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	phy->dev		= &pdev->dev;
+	spin_lock_init(&phy->lock);
 
 	if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
 		match = of_match_device(of_match_ptr(ti_pipe3_id_table),
@@ -333,21 +339,24 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 		}
 	}
 
+	phy->refclk = devm_clk_get(phy->dev, "refclk");
+	if (IS_ERR(phy->refclk)) {
+		dev_err(&pdev->dev, "unable to get refclk\n");
+		/* older DTBs have missing refclk in SATA PHY
+		 * so don't bail out in case of SATA PHY.
+		 */
+		if (!of_device_is_compatible(node, "ti,phy-pipe3-sata"))
+			return PTR_ERR(phy->refclk);
+	}
+
 	if (!of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
 		phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 		if (IS_ERR(phy->wkupclk)) {
 			dev_err(&pdev->dev, "unable to get wkupclk\n");
 			return PTR_ERR(phy->wkupclk);
 		}
-
-		phy->refclk = devm_clk_get(phy->dev, "refclk");
-		if (IS_ERR(phy->refclk)) {
-			dev_err(&pdev->dev, "unable to get refclk\n");
-			return PTR_ERR(phy->refclk);
-		}
 	} else {
 		phy->wkupclk = ERR_PTR(-ENODEV);
-		phy->refclk = ERR_PTR(-ENODEV);
 	}
 
 	if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
@@ -426,33 +435,42 @@ static int ti_pipe3_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
-
-static int ti_pipe3_runtime_suspend(struct device *dev)
+static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
 {
-	struct ti_pipe3	*phy = dev_get_drvdata(dev);
+	if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
+		int ret;
 
-	if (!IS_ERR(phy->wkupclk))
-		clk_disable_unprepare(phy->wkupclk);
+		ret = clk_prepare_enable(phy->refclk);
+		if (ret) {
+			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
+			return ret;
+		}
+		phy->refclk_enabled = true;
+	}
+
+	return 0;
+}
+
+static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
+{
 	if (!IS_ERR(phy->refclk))
 		clk_disable_unprepare(phy->refclk);
-	if (!IS_ERR(phy->div_clk))
-		clk_disable_unprepare(phy->div_clk);
 
-	return 0;
+	phy->refclk_enabled = false;
 }
 
-static int ti_pipe3_runtime_resume(struct device *dev)
+static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
 {
-	u32 ret = 0;
-	struct ti_pipe3	*phy = dev_get_drvdata(dev);
+	int ret = 0;
+	unsigned long flags;
 
-	if (!IS_ERR(phy->refclk)) {
-		ret = clk_prepare_enable(phy->refclk);
-		if (ret) {
-			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
-			goto err1;
-		}
-	}
+	spin_lock_irqsave(&phy->lock, flags);
+	if (phy->enabled)
+		goto err1;
+
+	ret = ti_pipe3_enable_refclk(phy);
+	if (ret)
+		goto err1;
 
 	if (!IS_ERR(phy->wkupclk)) {
 		ret = clk_prepare_enable(phy->wkupclk);
@@ -469,6 +487,9 @@ static int ti_pipe3_runtime_resume(struct device *dev)
 			goto err3;
 		}
 	}
+
+	phy->enabled = true;
+	spin_unlock_irqrestore(&phy->lock, flags);
 	return 0;
 
 err3:
@@ -479,20 +500,80 @@ err2:
 	if (!IS_ERR(phy->refclk))
 		clk_disable_unprepare(phy->refclk);
 
+	ti_pipe3_disable_refclk(phy);
 err1:
+	spin_unlock_irqrestore(&phy->lock, flags);
 	return ret;
 }
 
+static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&phy->lock, flags);
+	if (!phy->enabled) {
+		spin_unlock_irqrestore(&phy->lock, flags);
+		return;
+	}
+
+	if (!IS_ERR(phy->wkupclk))
+		clk_disable_unprepare(phy->wkupclk);
+	/* Don't disable refclk for SATA PHY due to Errata i783 */
+	if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata"))
+		ti_pipe3_disable_refclk(phy);
+	if (!IS_ERR(phy->div_clk))
+		clk_disable_unprepare(phy->div_clk);
+	phy->enabled = false;
+	spin_unlock_irqrestore(&phy->lock, flags);
+}
+
+static int ti_pipe3_runtime_suspend(struct device *dev)
+{
+	struct ti_pipe3	*phy = dev_get_drvdata(dev);
+
+	ti_pipe3_disable_clocks(phy);
+	return 0;
+}
+
+static int ti_pipe3_runtime_resume(struct device *dev)
+{
+	struct ti_pipe3	*phy = dev_get_drvdata(dev);
+	int ret = 0;
+
+	ret = ti_pipe3_enable_clocks(phy);
+	return ret;
+}
+
+static int ti_pipe3_suspend(struct device *dev)
+{
+	struct ti_pipe3	*phy = dev_get_drvdata(dev);
+
+	ti_pipe3_disable_clocks(phy);
+	return 0;
+}
+
+static int ti_pipe3_resume(struct device *dev)
+{
+	struct ti_pipe3	*phy = dev_get_drvdata(dev);
+	int ret;
+
+	ret = ti_pipe3_enable_clocks(phy);
+	if (ret)
+		return ret;
+
+	pm_runtime_disable(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	return 0;
+}
+#endif
+
 static const struct dev_pm_ops ti_pipe3_pm_ops = {
 	SET_RUNTIME_PM_OPS(ti_pipe3_runtime_suspend,
 			   ti_pipe3_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(ti_pipe3_suspend, ti_pipe3_resume)
 };
 
-#define DEV_PM_OPS     (&ti_pipe3_pm_ops)
-#else
-#define DEV_PM_OPS     NULL
-#endif
-
 #ifdef CONFIG_OF
 static const struct of_device_id ti_pipe3_id_table[] = {
 	{
@@ -520,7 +601,7 @@ static struct platform_driver ti_pipe3_driver = {
 	.remove		= ti_pipe3_remove,
 	.driver		= {
 		.name	= "ti-pipe3",
-		.pm	= DEV_PM_OPS,
+		.pm	= &ti_pipe3_pm_ops,
 		.of_match_table = of_match_ptr(ti_pipe3_id_table),
 	},
 };