[PATCH 1/2] phy: ti-pipe3: Disable clocks on system suspend
On system suspend, the runtime_suspend() driver hook doesn't get
called 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.
Add suspend/resume hooks to the driver.
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.
Move enabling/disabling clock code into helper functions.
Reported-by: Nishant Menon
Signed-off-by: Roger Quadros
---
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 1387b4d..e60ff14 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -28,6 +28,7 @@
#include
#include
#include
+#include
#definePLL_STATUS 0x0004
#definePLL_GO 0x0008
@@ -83,6 +84,8 @@ struct ti_pipe3 {
struct clk *div_clk;
struct pipe3_dpll_map *dpll_map;
u8 id;
+ bool enabled;
+ spinlock_t lock;/* serialize clock enable/disable */
};
static struct pipe3_dpll_map dpll_map_usb[] = {
@@ -303,6 +306,7 @@ 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),
@@ -425,24 +429,14 @@ 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);
@@ -467,6 +461,9 @@ static int ti_pipe3_runtime_resume(struct device *dev)
goto err3;
}
}
+
+ phy->enabled = true;
+ spin_unlock_irqrestore(&phy->lock, flags);
return 0;
err3:
@@ -478,19 +475,77 @@ 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[] = {
{
@@ -518,7 +573,7 @@ static struct
Re: [PATCH 1/2] phy: ti-pipe3: Disable clocks on system suspend
Hi Roger,
On Friday 19 December 2014 05:35 PM, Roger Quadros wrote:
> On system suspend, the runtime_suspend() driver hook doesn't get
> called 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.
>
> Add suspend/resume hooks to the driver.
> In case of pcie-phy, the runtime_suspend hook gets called after
This contradicts with the first line of your commit message. Is pcie-phy driver
is an exception?
Thanks
Kishon
> 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.
>
> Move enabling/disabling clock code into helper functions.
>
> Reported-by: Nishant Menon
> Signed-off-by: Roger Quadros
> ---
> 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 1387b4d..e60ff14 100644
> --- a/drivers/phy/phy-ti-pipe3.c
> +++ b/drivers/phy/phy-ti-pipe3.c
> @@ -28,6 +28,7 @@
> #include
> #include
> #include
> +#include
>
> #define PLL_STATUS 0x0004
> #define PLL_GO 0x0008
> @@ -83,6 +84,8 @@ struct ti_pipe3 {
> struct clk *div_clk;
> struct pipe3_dpll_map *dpll_map;
> u8 id;
> + bool enabled;
> + spinlock_t lock;/* serialize clock enable/disable */
> };
>
> static struct pipe3_dpll_map dpll_map_usb[] = {
> @@ -303,6 +306,7 @@ 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),
> @@ -425,24 +429,14 @@ 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);
> @@ -467,6 +461,9 @@ static int ti_pipe3_runtime_resume(struct device *dev)
> goto err3;
> }
> }
> +
> + phy->enabled = true;
> + spin_unlock_irqrestore(&phy->lock, flags);
> return 0;
>
> err3:
> @@ -478,19 +475,77 @@ 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_
Re: [PATCH 1/2] phy: ti-pipe3: Disable clocks on system suspend
Kishon, On 09/01/15 15:57, Kishon Vijay Abraham I wrote: > Hi Roger, > > On Friday 19 December 2014 05:35 PM, Roger Quadros wrote: >> On system suspend, the runtime_suspend() driver hook doesn't get >> called 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. >> >> Add suspend/resume hooks to the driver. >> In case of pcie-phy, the runtime_suspend hook gets called after > > This contradicts with the first line of your commit message. Is pcie-phy > driver > is an exception? Yes in the pcie-phy case it behaves differently. I'll rewrite the message. cheers, -roger > > Thanks > Kishon > >> 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. >> >> Move enabling/disabling clock code into helper functions. >> >> Reported-by: Nishant Menon >> Signed-off-by: Roger Quadros -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
