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Message-ID: <1422714496-423-2-git-send-email-kishon@ti.com>
Date: Sat, 31 Jan 2015 19:58:08 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: <gregkh@...uxfoundation.org>
CC: <kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/9] phy: ti-pipe3: Disable clocks on system suspend
From: Roger Quadros <rogerq@...com>
On system suspend, the runtime_suspend() driver hook doesn't get
called for USB phy and so the clocks are not disabled in the driver.
This causes the L3INIT_960M_GFCLK and L3INIT_480M_GFCLK to remain
active on the DRA7 platform while in system suspend.
In case of pcie-phy, the runtime_suspend hook gets called after
the suspend hook so we introduce a flag phy->enabled to keep
track if our clocks are enabled or not to prevent multiple
enable/disables.
Add suspend/resume hooks to the driver.
Move enabling/disabling clock code into helper functions.
Reported-by: Nishant Menon <nm@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
drivers/phy/phy-ti-pipe3.c | 99 ++++++++++++++++++++++++++++++++++----------
1 file changed, 77 insertions(+), 22 deletions(-)
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index 465de2c..8c85468 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 +83,8 @@ 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 */
};
static struct pipe3_dpll_map dpll_map_usb[] = {
@@ -307,6 +310,7 @@ 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),
@@ -427,24 +431,14 @@ 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_clocks(struct ti_pipe3 *phy)
{
- struct ti_pipe3 *phy = dev_get_drvdata(dev);
-
- if (!IS_ERR(phy->wkupclk))
- clk_disable_unprepare(phy->wkupclk);
- if (!IS_ERR(phy->refclk))
- clk_disable_unprepare(phy->refclk);
- if (!IS_ERR(phy->div_clk))
- clk_disable_unprepare(phy->div_clk);
-
- return 0;
-}
+ int ret = 0;
+ unsigned long flags;
-static int ti_pipe3_runtime_resume(struct device *dev)
-{
- u32 ret = 0;
- struct ti_pipe3 *phy = dev_get_drvdata(dev);
+ spin_lock_irqsave(&phy->lock, flags);
+ if (phy->enabled)
+ goto err1;
if (!IS_ERR(phy->refclk)) {
ret = clk_prepare_enable(phy->refclk);
@@ -469,6 +463,9 @@ static int ti_pipe3_runtime_resume(struct device *dev)
goto err3;
}
}
+
+ phy->enabled = true;
+ spin_unlock_irqrestore(&phy->lock, flags);
return 0;
err3:
@@ -480,19 +477,77 @@ err2:
clk_disable_unprepare(phy->refclk);
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);
+ if (!IS_ERR(phy->refclk))
+ clk_disable_unprepare(phy->refclk);
+ 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 +575,7 @@ 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),
},
};
--
1.7.9.5
--
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