[PATCH 0/3] phy: ti-pipe3: dra7: sata: allow suspend to RAM

[PATCH 0/3] phy: ti-pipe3: dra7: sata: allow suspend to RAM

[Roger Quadros]

Hi,

We fix 2 things here to ensure that PHY clocks are disabled during
system suspend.

1) Stop relying on pm_runtime ops to disable our clocks as they don't
fit in well with the PHY framework usage scenario. This ensures that all clocks are
disabled when phy_exit() is called.

2) Implement workaround for SATA errata i783 (SATA Lockup After SATA DPLL Unlock/Relock)
so that we can now turn off sata_refclk to support suspend-to-ram.

cheers,
-roger

Roger Quadros (3):
  phy: ti-pipe3: fix suspend
  phy: ti-pipe3: i783 workaround for SATA lockup after dpll
    unlock/relock
  ARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY

 Documentation/devicetree/bindings/phy/ti-phy.txt |  16 +++
 arch/arm/boot/dts/dra7.dtsi                      |   1 +
 drivers/phy/phy-ti-pipe3.c                       | 173 ++++++++++-------------
 3 files changed, 90 insertions(+), 100 deletions(-)

-- 
2.1.4

[PATCH 1/3] phy: ti-pipe3: fix suspend

[Roger Quadros]

Relying on PM-ops for shutting down PHY clocks was a
bad idea since the users (e.g. PCIe/SATA) might not
have been suspended by then.

The main culprit for not shutting down the clocks was
the stray pm_runtime_get() call in probe.

Fix the whole thing in the right way by getting rid
of that pm_runtime_get() call from probe and
removing all PM-ops. It is the sole responsibility
of the PHY user to properly turn OFF and de-initialize
the PHY as part of its suspend routine.

As PHY core serializes init/exit we don't need
to use a spinlock in this driver. So get rid of it.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
 drivers/phy/phy-ti-pipe3.c | 112 ++++++++-------------------------------------
 1 file changed, 18 insertions(+), 94 deletions(-)

diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index 53f295c..e13a306 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -28,7 +28,6 @@
 #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
@@ -83,10 +82,6 @@ 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[] = {
@@ -137,6 +132,9 @@ static struct pipe3_dpll_params *ti_pipe3_get_dpll_params(struct ti_pipe3 *phy)
 	return NULL;
 }
 
+static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy);
+static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
+
 static int ti_pipe3_power_off(struct phy *x)
 {
 	struct ti_pipe3 *phy = phy_get_drvdata(x);
@@ -217,6 +215,7 @@ static int ti_pipe3_init(struct phy *x)
 	u32 val;
 	int ret = 0;
 
+	ti_pipe3_enable_clocks(phy);
 	/*
 	 * Set pcie_pcs register to 0x96 for proper functioning of phy
 	 * as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table
@@ -277,6 +276,8 @@ static int ti_pipe3_exit(struct phy *x)
 		return -EBUSY;
 	}
 
+	ti_pipe3_disable_clocks(phy);
+
 	return 0;
 }
 static struct phy_ops ops = {
@@ -305,8 +306,7 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 	if (!phy)
 		return -ENOMEM;
 
-	phy->dev		= &pdev->dev;
-	spin_lock_init(&phy->lock);
+	phy->dev = &pdev->dev;
 
 	if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
 		match = of_match_device(ti_pipe3_id_table, &pdev->dev);
@@ -402,6 +402,9 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, phy);
 	pm_runtime_enable(phy->dev);
+	/* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
+	if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
+		clk_prepare_enable(phy->refclk);
 
 	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 	if (IS_ERR(generic_phy))
@@ -413,24 +416,19 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 	if (IS_ERR(phy_provider))
 		return PTR_ERR(phy_provider);
 
-	pm_runtime_get(&pdev->dev);
-
 	return 0;
 }
 
 static int ti_pipe3_remove(struct platform_device *pdev)
 {
-	if (!pm_runtime_suspended(&pdev->dev))
-		pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 
 	return 0;
 }
 
-#ifdef CONFIG_PM
 static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
 {
-	if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
+	if (!IS_ERR(phy->refclk)) {
 		int ret;
 
 		ret = clk_prepare_enable(phy->refclk);
@@ -438,7 +436,6 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
 			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
 			return ret;
 		}
-		phy->refclk_enabled = true;
 	}
 
 	return 0;
@@ -448,28 +445,21 @@ static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
 {
 	if (!IS_ERR(phy->refclk))
 		clk_disable_unprepare(phy->refclk);
-
-	phy->refclk_enabled = false;
 }
 
 static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
 {
 	int ret = 0;
-	unsigned long flags;
-
-	spin_lock_irqsave(&phy->lock, flags);
-	if (phy->enabled)
-		goto err1;
 
 	ret = ti_pipe3_enable_refclk(phy);
 	if (ret)
-		goto err1;
+		return ret;
 
 	if (!IS_ERR(phy->wkupclk)) {
 		ret = clk_prepare_enable(phy->wkupclk);
 		if (ret) {
 			dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
-			goto err2;
+			goto disable_refclk;
 		}
 	}
 
@@ -477,96 +467,31 @@ static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
 		ret = clk_prepare_enable(phy->div_clk);
 		if (ret) {
 			dev_err(phy->dev, "Failed to enable div_clk %d\n", ret);
-			goto err3;
+			goto disable_wkupclk;
 		}
 	}
 
-	phy->enabled = true;
-	spin_unlock_irqrestore(&phy->lock, flags);
 	return 0;
 
-err3:
+disable_wkupclk:
 	if (!IS_ERR(phy->wkupclk))
 		clk_disable_unprepare(phy->wkupclk);
 
-err2:
-	if (!IS_ERR(phy->refclk))
-		clk_disable_unprepare(phy->refclk);
-
+disable_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);
+	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)
-};
-
 static const struct of_device_id ti_pipe3_id_table[] = {
 	{
 		.compatible = "ti,phy-usb3",
@@ -592,7 +517,6 @@ static struct platform_driver ti_pipe3_driver = {
 	.remove		= ti_pipe3_remove,
 	.driver		= {
 		.name	= "ti-pipe3",
-		.pm	= &ti_pipe3_pm_ops,
 		.of_match_table = ti_pipe3_id_table,
 	},
 };
-- 
2.1.4

Re: [PATCH 1/3] phy: ti-pipe3: fix suspend

[Kishon Vijay Abraham I]

Hi Roger,

On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
> Relying on PM-ops for shutting down PHY clocks was a
> bad idea since the users (e.g. PCIe/SATA) might not
> have been suspended by then.
>
> The main culprit for not shutting down the clocks was
> the stray pm_runtime_get() call in probe.
>
> Fix the whole thing in the right way by getting rid
> of that pm_runtime_get() call from probe and
> removing all PM-ops. It is the sole responsibility
> of the PHY user to properly turn OFF and de-initialize
> the PHY as part of its suspend routine.
>
> As PHY core serializes init/exit we don't need
> to use a spinlock in this driver. So get rid of it.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
> ---
>   drivers/phy/phy-ti-pipe3.c | 112 ++++++++-------------------------------------
>   1 file changed, 18 insertions(+), 94 deletions(-)
>
> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
> index 53f295c..e13a306 100644
> --- a/drivers/phy/phy-ti-pipe3.c
> +++ b/drivers/phy/phy-ti-pipe3.c
> @@ -28,7 +28,6 @@
>   #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
> @@ -83,10 +82,6 @@ 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[] = {
> @@ -137,6 +132,9 @@ static struct pipe3_dpll_params *ti_pipe3_get_dpll_params(struct ti_pipe3 *phy)
>   	return NULL;
>   }
>
> +static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy);
> +static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
> +
>   static int ti_pipe3_power_off(struct phy *x)
>   {
>   	struct ti_pipe3 *phy = phy_get_drvdata(x);
> @@ -217,6 +215,7 @@ static int ti_pipe3_init(struct phy *x)
>   	u32 val;
>   	int ret = 0;
>
> +	ti_pipe3_enable_clocks(phy);
>   	/*
>   	 * Set pcie_pcs register to 0x96 for proper functioning of phy
>   	 * as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table
> @@ -277,6 +276,8 @@ static int ti_pipe3_exit(struct phy *x)
>   		return -EBUSY;
>   	}
>
> +	ti_pipe3_disable_clocks(phy);
> +
>   	return 0;
>   }
>   static struct phy_ops ops = {
> @@ -305,8 +306,7 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>   	if (!phy)
>   		return -ENOMEM;
>
> -	phy->dev		= &pdev->dev;
> -	spin_lock_init(&phy->lock);
> +	phy->dev = &pdev->dev;

this looks more of a cleanup.
>
>   	if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>   		match = of_match_device(ti_pipe3_id_table, &pdev->dev);
> @@ -402,6 +402,9 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>
>   	platform_set_drvdata(pdev, phy);
>   	pm_runtime_enable(phy->dev);
> +	/* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
> +	if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
> +		clk_prepare_enable(phy->refclk);
>
>   	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>   	if (IS_ERR(generic_phy))
> @@ -413,24 +416,19 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>   	if (IS_ERR(phy_provider))
>   		return PTR_ERR(phy_provider);
>
> -	pm_runtime_get(&pdev->dev);
> -
>   	return 0;
>   }
>
>   static int ti_pipe3_remove(struct platform_device *pdev)
>   {
> -	if (!pm_runtime_suspended(&pdev->dev))
> -		pm_runtime_put(&pdev->dev);
>   	pm_runtime_disable(&pdev->dev);
>
>   	return 0;
>   }
>
> -#ifdef CONFIG_PM
>   static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
>   {
> -	if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
> +	if (!IS_ERR(phy->refclk)) {
>   		int ret;
>
>   		ret = clk_prepare_enable(phy->refclk);
> @@ -438,7 +436,6 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
>   			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
>   			return ret;
>   		}
> -		phy->refclk_enabled = true;
>   	}
>
>   	return 0;
> @@ -448,28 +445,21 @@ static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>   {
>   	if (!IS_ERR(phy->refclk))
>   		clk_disable_unprepare(phy->refclk);
> -
> -	phy->refclk_enabled = false;
>   }
>
>   static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
>   {
>   	int ret = 0;
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&phy->lock, flags);
> -	if (phy->enabled)
> -		goto err1;
>
>   	ret = ti_pipe3_enable_refclk(phy);

we can enable refclk here itself instead of having a separate function it?
>   	if (ret)
> -		goto err1;
> +		return ret;
>
>   	if (!IS_ERR(phy->wkupclk)) {
>   		ret = clk_prepare_enable(phy->wkupclk);
>   		if (ret) {
>   			dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
> -			goto err2;
> +			goto disable_refclk;
>   		}
>   	}
>
> @@ -477,96 +467,31 @@ static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
>   		ret = clk_prepare_enable(phy->div_clk);
>   		if (ret) {
>   			dev_err(phy->dev, "Failed to enable div_clk %d\n", ret);
> -			goto err3;
> +			goto disable_wkupclk;
>   		}
>   	}
>
> -	phy->enabled = true;
> -	spin_unlock_irqrestore(&phy->lock, flags);
>   	return 0;
>
> -err3:
> +disable_wkupclk:
>   	if (!IS_ERR(phy->wkupclk))
>   		clk_disable_unprepare(phy->wkupclk);
>
> -err2:
> -	if (!IS_ERR(phy->refclk))
> -		clk_disable_unprepare(phy->refclk);
> -
> +disable_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);
> +	ti_pipe3_disable_refclk(phy);

here too. we can get rid of ti_pipe3_disable_refclk and ti_pipe3_enable_refclk.

Thanks
Kishon

Re: [PATCH 1/3] phy: ti-pipe3: fix suspend

[Roger Quadros]

Kishon,

On 20/05/15 16:04, Kishon Vijay Abraham I wrote:
> Hi Roger,
>
> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>> Relying on PM-ops for shutting down PHY clocks was a
>> bad idea since the users (e.g. PCIe/SATA) might not
>> have been suspended by then.
>>
>> The main culprit for not shutting down the clocks was
>> the stray pm_runtime_get() call in probe.
>>
>> Fix the whole thing in the right way by getting rid
>> of that pm_runtime_get() call from probe and
>> removing all PM-ops. It is the sole responsibility
>> of the PHY user to properly turn OFF and de-initialize
>> the PHY as part of its suspend routine.
>>
>> As PHY core serializes init/exit we don't need
>> to use a spinlock in this driver. So get rid of it.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
>> ---
>>   drivers/phy/phy-ti-pipe3.c | 112
>> ++++++++-------------------------------------
>>   1 file changed, 18 insertions(+), 94 deletions(-)
>>
>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>> index 53f295c..e13a306 100644
>> --- a/drivers/phy/phy-ti-pipe3.c
>> +++ b/drivers/phy/phy-ti-pipe3.c
>> @@ -28,7 +28,6 @@
>>   #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
>> @@ -83,10 +82,6 @@ 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[] = {
>> @@ -137,6 +132,9 @@ static struct pipe3_dpll_params
>> *ti_pipe3_get_dpll_params(struct ti_pipe3 *phy)
>>       return NULL;
>>   }
>>
>> +static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy);
>> +static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
>> +
>>   static int ti_pipe3_power_off(struct phy *x)
>>   {
>>       struct ti_pipe3 *phy = phy_get_drvdata(x);
>> @@ -217,6 +215,7 @@ static int ti_pipe3_init(struct phy *x)
>>       u32 val;
>>       int ret = 0;
>>
>> +    ti_pipe3_enable_clocks(phy);
>>       /*
>>        * Set pcie_pcs register to 0x96 for proper functioning of phy
>>        * as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table
>> @@ -277,6 +276,8 @@ static int ti_pipe3_exit(struct phy *x)
>>           return -EBUSY;
>>       }
>>
>> +    ti_pipe3_disable_clocks(phy);
>> +
>>       return 0;
>>   }
>>   static struct phy_ops ops = {
>> @@ -305,8 +306,7 @@ static int ti_pipe3_probe(struct platform_device
>> *pdev)
>>       if (!phy)
>>           return -ENOMEM;
>>
>> -    phy->dev        = &pdev->dev;
>> -    spin_lock_init(&phy->lock);
>> +    phy->dev = &pdev->dev;
>
> this looks more of a cleanup.

ok will get rid of it.
>>
>>       if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>>           match = of_match_device(ti_pipe3_id_table, &pdev->dev);
>> @@ -402,6 +402,9 @@ static int ti_pipe3_probe(struct platform_device
>> *pdev)
>>
>>       platform_set_drvdata(pdev, phy);
>>       pm_runtime_enable(phy->dev);
>> +    /* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
>> +    if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
>> +        clk_prepare_enable(phy->refclk);
>>
>>       generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>>       if (IS_ERR(generic_phy))
>> @@ -413,24 +416,19 @@ static int ti_pipe3_probe(struct platform_device
>> *pdev)
>>       if (IS_ERR(phy_provider))
>>           return PTR_ERR(phy_provider);
>>
>> -    pm_runtime_get(&pdev->dev);
>> -
>>       return 0;
>>   }
>>
>>   static int ti_pipe3_remove(struct platform_device *pdev)
>>   {
>> -    if (!pm_runtime_suspended(&pdev->dev))
>> -        pm_runtime_put(&pdev->dev);
>>       pm_runtime_disable(&pdev->dev);
>>
>>       return 0;
>>   }
>>
>> -#ifdef CONFIG_PM
>>   static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
>>   {
>> -    if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
>> +    if (!IS_ERR(phy->refclk)) {
>>           int ret;
>>
>>           ret = clk_prepare_enable(phy->refclk);
>> @@ -438,7 +436,6 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3
>> *phy)
>>               dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
>>               return ret;
>>           }
>> -        phy->refclk_enabled = true;
>>       }
>>
>>       return 0;
>> @@ -448,28 +445,21 @@ static void ti_pipe3_disable_refclk(struct
>> ti_pipe3 *phy)
>>   {
>>       if (!IS_ERR(phy->refclk))
>>           clk_disable_unprepare(phy->refclk);
>> -
>> -    phy->refclk_enabled = false;
>>   }
>>
>>   static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
>>   {
>>       int ret = 0;
>> -    unsigned long flags;
>> -
>> -    spin_lock_irqsave(&phy->lock, flags);
>> -    if (phy->enabled)
>> -        goto err1;
>>
>>       ret = ti_pipe3_enable_refclk(phy);
>
> we can enable refclk here itself instead of having a separate function it?
>>       if (ret)
>> -        goto err1;
>> +        return ret;
>>
>>       if (!IS_ERR(phy->wkupclk)) {
>>           ret = clk_prepare_enable(phy->wkupclk);
>>           if (ret) {
>>               dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
>> -            goto err2;
>> +            goto disable_refclk;
>>           }
>>       }
>>
>> @@ -477,96 +467,31 @@ static int ti_pipe3_enable_clocks(struct
>> ti_pipe3 *phy)
>>           ret = clk_prepare_enable(phy->div_clk);
>>           if (ret) {
>>               dev_err(phy->dev, "Failed to enable div_clk %d\n", ret);
>> -            goto err3;
>> +            goto disable_wkupclk;
>>           }
>>       }
>>
>> -    phy->enabled = true;
>> -    spin_unlock_irqrestore(&phy->lock, flags);
>>       return 0;
>>
>> -err3:
>> +disable_wkupclk:
>>       if (!IS_ERR(phy->wkupclk))
>>           clk_disable_unprepare(phy->wkupclk);
>>
>> -err2:
>> -    if (!IS_ERR(phy->refclk))
>> -        clk_disable_unprepare(phy->refclk);
>> -
>> +disable_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);
>> +    ti_pipe3_disable_refclk(phy);
>
> here too. we can get rid of ti_pipe3_disable_refclk and
> ti_pipe3_enable_refclk.
>

fine.

cheers,
-roger

[PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Roger Quadros]

SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
between a SATA DPLL unlock and re-lock to prevent SATA lockup.

Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
regmap access to this register which sits in the control module.

If the register is not provided we fallback to the old behaviour
i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
power states.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
 drivers/phy/phy-ti-pipe3.c                       | 67 ++++++++++++++++++++----
 2 files changed, 74 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index 305e3df..f0f5537 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -82,6 +82,9 @@ Optional properties:
  - id: If there are multiple instance of the same type, in order to
    differentiate between each instance "id" can be used (e.g., multi-lane PCIe
    PHY). If "id" is not provided, it is set to default value of '1'.
+ - syscon-pllreset: Handle to system control region that contains the
+   CTRL_CORE_SMA_SW_0 register and register offset to the CTRL_CORE_SMA_SW_0
+   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for sata_phy.
 
 This is usually a subnode of ocp2scp to which it is connected.
 
@@ -100,3 +103,16 @@ usb3phy@4a084400 {
 			"sysclk",
 			"refclk";
 };
+
+sata_phy: phy@4A096000 {
+	compatible = "ti,phy-pipe3-sata";
+	reg = <0x4A096000 0x80>, /* phy_rx */
+	      <0x4A096400 0x64>, /* phy_tx */
+	      <0x4A096800 0x40>; /* pll_ctrl */
+	reg-names = "phy_rx", "phy_tx", "pll_ctrl";
+	ctrl-module = <&omap_control_sata>;
+	clocks = <&sys_clkin1>, <&sata_ref_clk>;
+	clock-names = "sysclk", "refclk";
+	syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
+	#phy-cells = <0>;
+};
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index e13a306..d730142 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -28,6 +28,8 @@
 #include <linux/delay.h>
 #include <linux/phy/omap_control_phy.h>
 #include <linux/of_platform.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #define	PLL_STATUS		0x00000004
 #define	PLL_GO			0x00000008
@@ -52,6 +54,8 @@
 #define	PLL_LOCK		0x2
 #define	PLL_IDLE		0x1
 
+#define SATA_PLL_SOFT_RESET	BIT(18)
+
 /*
  * This is an Empirical value that works, need to confirm the actual
  * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
@@ -82,6 +86,9 @@ struct ti_pipe3 {
 	struct clk		*refclk;
 	struct clk		*div_clk;
 	struct pipe3_dpll_map	*dpll_map;
+	struct regmap		*dpll_reset_syscon; /* ctrl. reg. acces */
+	unsigned int		dpll_reset_reg; /* reg. index within syscon */
+	bool			sata_refclk_enabled;
 };
 
 static struct pipe3_dpll_map dpll_map_usb[] = {
@@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
 	u32 val;
 	unsigned long timeout;
 
-	/* SATA DPLL can't be powered down due to Errata i783 and PCIe
-	 * does not have internal DPLL
+	/* If dpll_reset_syscon is not present we wont power down SATA DPLL
+	 * due to Errata i783
 	 */
-	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") ||
-	    of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
+	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") &&
+	    !phy->dpll_reset_syscon)
+		return 0;
+
+	/* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
+	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
 		return 0;
 
 	/* Put DPLL in IDLE mode */
@@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
 		return -EBUSY;
 	}
 
+	/* i783: SATA needs control bit toggle after PLL unlock */
+	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata")) {
+		regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
+				SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
+		regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
+				SATA_PLL_SOFT_RESET, 0);
+	}
+
 	ti_pipe3_disable_clocks(phy);
 
 	return 0;
@@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 		}
 	} else {
 		phy->wkupclk = ERR_PTR(-ENODEV);
+		phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
+							"syscon-pllreset");
+		if (IS_ERR(phy->dpll_reset_syscon)) {
+			dev_info(&pdev->dev,
+				 "can't get syscon-pllreset, sata dpll won't idle\n");
+			phy->dpll_reset_syscon = NULL;
+		} else {
+			if (of_property_read_u32_index(node,
+						       "syscon-pllreset", 1,
+						       &phy->dpll_reset_reg)) {
+				dev_err(&pdev->dev,
+					"couldn't get pllreset reg. offset\n");
+				return -EINVAL;
+			}
+		}
 	}
 
 	if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
@@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, phy);
 	pm_runtime_enable(phy->dev);
-	/* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
-	if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
-		clk_prepare_enable(phy->refclk);
+
+	/*
+	 * Prevent auto-disable of refclk for SATA PHY due to Errata i783
+	 */
+	if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
+		if (!IS_ERR(phy->refclk)) {
+			clk_prepare_enable(phy->refclk);
+			phy->sata_refclk_enabled = true;
+		}
+	}
 
 	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 	if (IS_ERR(generic_phy))
@@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
 
 static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
 {
-	if (!IS_ERR(phy->refclk))
+	if (!IS_ERR(phy->refclk)) {
 		clk_disable_unprepare(phy->refclk);
+		/*
+		 * SATA refclk needs an additional disable as we left it
+		 * on in probe to avoid Errata i783
+		 */
+		if (phy->sata_refclk_enabled) {
+			clk_disable_unprepare(phy->refclk);
+			phy->sata_refclk_enabled = false;
+		}
+	}
 }
 
 static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
@@ -476,7 +526,6 @@ static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
 disable_wkupclk:
 	if (!IS_ERR(phy->wkupclk))
 		clk_disable_unprepare(phy->wkupclk);
-
 disable_refclk:
 	ti_pipe3_disable_refclk(phy);
 
-- 
2.1.4

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Kishon Vijay Abraham I]

Hi Roger,

On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>
> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
> regmap access to this register which sits in the control module.
>
> If the register is not provided we fallback to the old behaviour
> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
> power states.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
>   Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>   drivers/phy/phy-ti-pipe3.c                       | 67 ++++++++++++++++++++----
>   2 files changed, 74 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
> index 305e3df..f0f5537 100644
> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
> @@ -82,6 +82,9 @@ Optional properties:
>    - id: If there are multiple instance of the same type, in order to
>      differentiate between each instance "id" can be used (e.g., multi-lane PCIe
>      PHY). If "id" is not provided, it is set to default value of '1'.
> + - syscon-pllreset: Handle to system control region that contains the
> +   CTRL_CORE_SMA_SW_0 register and register offset to the CTRL_CORE_SMA_SW_0
> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for sata_phy.
>
>   This is usually a subnode of ocp2scp to which it is connected.
>
> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>   			"sysclk",
>   			"refclk";
>   };
> +
> +sata_phy: phy@4A096000 {
> +	compatible = "ti,phy-pipe3-sata";
> +	reg = <0x4A096000 0x80>, /* phy_rx */
> +	      <0x4A096400 0x64>, /* phy_tx */
> +	      <0x4A096800 0x40>; /* pll_ctrl */
> +	reg-names = "phy_rx", "phy_tx", "pll_ctrl";
> +	ctrl-module = <&omap_control_sata>;
> +	clocks = <&sys_clkin1>, <&sata_ref_clk>;
> +	clock-names = "sysclk", "refclk";
> +	syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
> +	#phy-cells = <0>;
> +};
> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
> index e13a306..d730142 100644
> --- a/drivers/phy/phy-ti-pipe3.c
> +++ b/drivers/phy/phy-ti-pipe3.c
> @@ -28,6 +28,8 @@
>   #include <linux/delay.h>
>   #include <linux/phy/omap_control_phy.h>
>   #include <linux/of_platform.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
>
>   #define	PLL_STATUS		0x00000004
>   #define	PLL_GO			0x00000008
> @@ -52,6 +54,8 @@
>   #define	PLL_LOCK		0x2
>   #define	PLL_IDLE		0x1
>
> +#define SATA_PLL_SOFT_RESET	BIT(18)
> +
>   /*
>    * This is an Empirical value that works, need to confirm the actual
>    * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>   	struct clk		*refclk;
>   	struct clk		*div_clk;
>   	struct pipe3_dpll_map	*dpll_map;
> +	struct regmap		*dpll_reset_syscon; /* ctrl. reg. acces */
> +	unsigned int		dpll_reset_reg; /* reg. index within syscon */
> +	bool			sata_refclk_enabled;
>   };
>
>   static struct pipe3_dpll_map dpll_map_usb[] = {
> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>   	u32 val;
>   	unsigned long timeout;
>
> -	/* SATA DPLL can't be powered down due to Errata i783 and PCIe
> -	 * does not have internal DPLL
> +	/* If dpll_reset_syscon is not present we wont power down SATA DPLL
> +	 * due to Errata i783
>   	 */
> -	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") ||
> -	    of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
> +	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") &&
> +	    !phy->dpll_reset_syscon)
> +		return 0;
> +
> +	/* PCIe doesn't have DPLL. FIXME: need to disable clocks though */

I think it's better to fix it in this patch itself.. to disable clocks for PCIe.
> +	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>   		return 0;
>
>   	/* Put DPLL in IDLE mode */
> @@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
>   		return -EBUSY;
>   	}
>
> +	/* i783: SATA needs control bit toggle after PLL unlock */
> +	if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata")) {
> +		regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
> +				SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
> +		regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
> +				SATA_PLL_SOFT_RESET, 0);
> +	}
> +
>   	ti_pipe3_disable_clocks(phy);
>
>   	return 0;
> @@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>   		}
>   	} else {
>   		phy->wkupclk = ERR_PTR(-ENODEV);
> +		phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
> +							"syscon-pllreset");
> +		if (IS_ERR(phy->dpll_reset_syscon)) {
> +			dev_info(&pdev->dev,
> +				 "can't get syscon-pllreset, sata dpll won't idle\n");
> +			phy->dpll_reset_syscon = NULL;
> +		} else {
> +			if (of_property_read_u32_index(node,
> +						       "syscon-pllreset", 1,
> +						       &phy->dpll_reset_reg)) {
> +				dev_err(&pdev->dev,
> +					"couldn't get pllreset reg. offset\n");
> +				return -EINVAL;
> +			}
> +		}
>   	}
>
>   	if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
> @@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>
>   	platform_set_drvdata(pdev, phy);
>   	pm_runtime_enable(phy->dev);
> -	/* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
> -	if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
> -		clk_prepare_enable(phy->refclk);
> +
> +	/*
> +	 * Prevent auto-disable of refclk for SATA PHY due to Errata i783
> +	 */
> +	if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
> +		if (!IS_ERR(phy->refclk)) {
> +			clk_prepare_enable(phy->refclk);
> +			phy->sata_refclk_enabled = true;
> +		}
> +	}
>
>   	generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>   	if (IS_ERR(generic_phy))
> @@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
>
>   static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>   {
> -	if (!IS_ERR(phy->refclk))
> +	if (!IS_ERR(phy->refclk)) {
>   		clk_disable_unprepare(phy->refclk);
> +		/*
> +		 * SATA refclk needs an additional disable as we left it
> +		 * on in probe to avoid Errata i783

not sure I get this. Why don't we remove it in probe?

Thanks
Kishon

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Roger Quadros]

Kishon,

On 20/05/15 16:19, Kishon Vijay Abraham I wrote:
> Hi Roger,
>
> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
>> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>>
>> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
>> regmap access to this register which sits in the control module.
>>
>> If the register is not provided we fallback to the old behaviour
>> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
>> power states.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> ---
>>   Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>>   drivers/phy/phy-ti-pipe3.c                       | 67
>> ++++++++++++++++++++----
>>   2 files changed, 74 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt
>> b/Documentation/devicetree/bindings/phy/ti-phy.txt
>> index 305e3df..f0f5537 100644
>> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
>> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
>> @@ -82,6 +82,9 @@ Optional properties:
>>    - id: If there are multiple instance of the same type, in order to
>>      differentiate between each instance "id" can be used (e.g.,
>> multi-lane PCIe
>>      PHY). If "id" is not provided, it is set to default value of '1'.
>> + - syscon-pllreset: Handle to system control region that contains the
>> +   CTRL_CORE_SMA_SW_0 register and register offset to the
>> CTRL_CORE_SMA_SW_0
>> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for
>> sata_phy.
>>
>>   This is usually a subnode of ocp2scp to which it is connected.
>>
>> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>>               "sysclk",
>>               "refclk";
>>   };
>> +
>> +sata_phy: phy@4A096000 {
>> +    compatible = "ti,phy-pipe3-sata";
>> +    reg = <0x4A096000 0x80>, /* phy_rx */
>> +          <0x4A096400 0x64>, /* phy_tx */
>> +          <0x4A096800 0x40>; /* pll_ctrl */
>> +    reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>> +    ctrl-module = <&omap_control_sata>;
>> +    clocks = <&sys_clkin1>, <&sata_ref_clk>;
>> +    clock-names = "sysclk", "refclk";
>> +    syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>> +    #phy-cells = <0>;
>> +};
>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>> index e13a306..d730142 100644
>> --- a/drivers/phy/phy-ti-pipe3.c
>> +++ b/drivers/phy/phy-ti-pipe3.c
>> @@ -28,6 +28,8 @@
>>   #include <linux/delay.h>
>>   #include <linux/phy/omap_control_phy.h>
>>   #include <linux/of_platform.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/regmap.h>
>>
>>   #define    PLL_STATUS        0x00000004
>>   #define    PLL_GO            0x00000008
>> @@ -52,6 +54,8 @@
>>   #define    PLL_LOCK        0x2
>>   #define    PLL_IDLE        0x1
>>
>> +#define SATA_PLL_SOFT_RESET    BIT(18)
>> +
>>   /*
>>    * This is an Empirical value that works, need to confirm the actual
>>    * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
>> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>>       struct clk        *refclk;
>>       struct clk        *div_clk;
>>       struct pipe3_dpll_map    *dpll_map;
>> +    struct regmap        *dpll_reset_syscon; /* ctrl. reg. acces */
>> +    unsigned int        dpll_reset_reg; /* reg. index within syscon */
>> +    bool            sata_refclk_enabled;
>>   };
>>
>>   static struct pipe3_dpll_map dpll_map_usb[] = {
>> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>>       u32 val;
>>       unsigned long timeout;
>>
>> -    /* SATA DPLL can't be powered down due to Errata i783 and PCIe
>> -     * does not have internal DPLL
>> +    /* If dpll_reset_syscon is not present we wont power down SATA DPLL
>> +     * due to Errata i783
>>        */
>> -    if (of_device_is_compatible(phy->dev->of_node,
>> "ti,phy-pipe3-sata") ||
>> -        of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>> +    if (of_device_is_compatible(phy->dev->of_node,
>> "ti,phy-pipe3-sata") &&
>> +        !phy->dpll_reset_syscon)
>> +        return 0;
>> +
>> +    /* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
>
> I think it's better to fix it in this patch itself.. to disable clocks
> for PCIe.
>> +    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>           return 0;
>>
>>       /* Put DPLL in IDLE mode */
>> @@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
>>           return -EBUSY;
>>       }
>>
>> +    /* i783: SATA needs control bit toggle after PLL unlock */
>> +    if (of_device_is_compatible(phy->dev->of_node,
>> "ti,phy-pipe3-sata")) {
>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>> +                SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>> +                SATA_PLL_SOFT_RESET, 0);
>> +    }
>> +
>>       ti_pipe3_disable_clocks(phy);
>>
>>       return 0;
>> @@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device
>> *pdev)
>>           }
>>       } else {
>>           phy->wkupclk = ERR_PTR(-ENODEV);
>> +        phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
>> +                            "syscon-pllreset");
>> +        if (IS_ERR(phy->dpll_reset_syscon)) {
>> +            dev_info(&pdev->dev,
>> +                 "can't get syscon-pllreset, sata dpll won't idle\n");
>> +            phy->dpll_reset_syscon = NULL;
>> +        } else {
>> +            if (of_property_read_u32_index(node,
>> +                               "syscon-pllreset", 1,
>> +                               &phy->dpll_reset_reg)) {
>> +                dev_err(&pdev->dev,
>> +                    "couldn't get pllreset reg. offset\n");
>> +                return -EINVAL;
>> +            }
>> +        }
>>       }
>>
>>       if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>> @@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device
>> *pdev)
>>
>>       platform_set_drvdata(pdev, phy);
>>       pm_runtime_enable(phy->dev);
>> -    /* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
>> -    if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
>> -        clk_prepare_enable(phy->refclk);
>> +
>> +    /*
>> +     * Prevent auto-disable of refclk for SATA PHY due to Errata i783
>> +     */
>> +    if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
>> +        if (!IS_ERR(phy->refclk)) {
>> +            clk_prepare_enable(phy->refclk);
>> +            phy->sata_refclk_enabled = true;
>> +        }
>> +    }
>>
>>       generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>>       if (IS_ERR(generic_phy))
>> @@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3
>> *phy)
>>
>>   static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>>   {
>> -    if (!IS_ERR(phy->refclk))
>> +    if (!IS_ERR(phy->refclk)) {
>>           clk_disable_unprepare(phy->refclk);
>> +        /*
>> +         * SATA refclk needs an additional disable as we left it
>> +         * on in probe to avoid Errata i783
>
> not sure I get this. Why don't we remove it in probe?

Because if we remove it from probe and if AHCI_PLATFORM is built as a 
module then phy_init won't be called before kernel starts autodisabling
unused clocks and so SATA refclk gets disabled causing i783 and
breaking SATA.

cheers,
-roger

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Kishon Vijay Abraham I]

Roger,

On Wednesday 20 May 2015 07:17 PM, Roger Quadros wrote:
> Kishon,
>
> On 20/05/15 16:19, Kishon Vijay Abraham I wrote:
>> Hi Roger,
>>
>> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>>> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
>>> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>>>
>>> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
>>> regmap access to this register which sits in the control module.
>>>
>>> If the register is not provided we fallback to the old behaviour
>>> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
>>> power states.
>>>
>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>> ---
>>>    Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>>>    drivers/phy/phy-ti-pipe3.c                       | 67
>>> ++++++++++++++++++++----
>>>    2 files changed, 74 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>> b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>> index 305e3df..f0f5537 100644
>>> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>> @@ -82,6 +82,9 @@ Optional properties:
>>>     - id: If there are multiple instance of the same type, in order to
>>>       differentiate between each instance "id" can be used (e.g.,
>>> multi-lane PCIe
>>>       PHY). If "id" is not provided, it is set to default value of '1'.
>>> + - syscon-pllreset: Handle to system control region that contains the
>>> +   CTRL_CORE_SMA_SW_0 register and register offset to the
>>> CTRL_CORE_SMA_SW_0
>>> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for
>>> sata_phy.
>>>
>>>    This is usually a subnode of ocp2scp to which it is connected.
>>>
>>> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>>>                "sysclk",
>>>                "refclk";
>>>    };
>>> +
>>> +sata_phy: phy@4A096000 {
>>> +    compatible = "ti,phy-pipe3-sata";
>>> +    reg = <0x4A096000 0x80>, /* phy_rx */
>>> +          <0x4A096400 0x64>, /* phy_tx */
>>> +          <0x4A096800 0x40>; /* pll_ctrl */
>>> +    reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>> +    ctrl-module = <&omap_control_sata>;
>>> +    clocks = <&sys_clkin1>, <&sata_ref_clk>;
>>> +    clock-names = "sysclk", "refclk";
>>> +    syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>>> +    #phy-cells = <0>;
>>> +};
>>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>>> index e13a306..d730142 100644
>>> --- a/drivers/phy/phy-ti-pipe3.c
>>> +++ b/drivers/phy/phy-ti-pipe3.c
>>> @@ -28,6 +28,8 @@
>>>    #include <linux/delay.h>
>>>    #include <linux/phy/omap_control_phy.h>
>>>    #include <linux/of_platform.h>
>>> +#include <linux/mfd/syscon.h>
>>> +#include <linux/regmap.h>
>>>
>>>    #define    PLL_STATUS        0x00000004
>>>    #define    PLL_GO            0x00000008
>>> @@ -52,6 +54,8 @@
>>>    #define    PLL_LOCK        0x2
>>>    #define    PLL_IDLE        0x1
>>>
>>> +#define SATA_PLL_SOFT_RESET    BIT(18)
>>> +
>>>    /*
>>>     * This is an Empirical value that works, need to confirm the actual
>>>     * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
>>> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>>>        struct clk        *refclk;
>>>        struct clk        *div_clk;
>>>        struct pipe3_dpll_map    *dpll_map;
>>> +    struct regmap        *dpll_reset_syscon; /* ctrl. reg. acces */
>>> +    unsigned int        dpll_reset_reg; /* reg. index within syscon */
>>> +    bool            sata_refclk_enabled;
>>>    };
>>>
>>>    static struct pipe3_dpll_map dpll_map_usb[] = {
>>> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>>>        u32 val;
>>>        unsigned long timeout;
>>>
>>> -    /* SATA DPLL can't be powered down due to Errata i783 and PCIe
>>> -     * does not have internal DPLL
>>> +    /* If dpll_reset_syscon is not present we wont power down SATA DPLL
>>> +     * due to Errata i783
>>>         */
>>> -    if (of_device_is_compatible(phy->dev->of_node,
>>> "ti,phy-pipe3-sata") ||
>>> -        of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>> "ti,phy-pipe3-sata") &&
>>> +        !phy->dpll_reset_syscon)
>>> +        return 0;
>>> +
>>> +    /* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
>>
>> I think it's better to fix it in this patch itself.. to disable clocks
>> for PCIe.
>>> +    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>            return 0;
>>>
>>>        /* Put DPLL in IDLE mode */
>>> @@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
>>>            return -EBUSY;
>>>        }
>>>
>>> +    /* i783: SATA needs control bit toggle after PLL unlock */
>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>> "ti,phy-pipe3-sata")) {
>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>> +                SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>> +                SATA_PLL_SOFT_RESET, 0);
>>> +    }
>>> +
>>>        ti_pipe3_disable_clocks(phy);
>>>
>>>        return 0;
>>> @@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device
>>> *pdev)
>>>            }
>>>        } else {
>>>            phy->wkupclk = ERR_PTR(-ENODEV);
>>> +        phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
>>> +                            "syscon-pllreset");
>>> +        if (IS_ERR(phy->dpll_reset_syscon)) {
>>> +            dev_info(&pdev->dev,
>>> +                 "can't get syscon-pllreset, sata dpll won't idle\n");
>>> +            phy->dpll_reset_syscon = NULL;
>>> +        } else {
>>> +            if (of_property_read_u32_index(node,
>>> +                               "syscon-pllreset", 1,
>>> +                               &phy->dpll_reset_reg)) {
>>> +                dev_err(&pdev->dev,
>>> +                    "couldn't get pllreset reg. offset\n");
>>> +                return -EINVAL;
>>> +            }
>>> +        }
>>>        }
>>>
>>>        if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>>> @@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device
>>> *pdev)
>>>
>>>        platform_set_drvdata(pdev, phy);
>>>        pm_runtime_enable(phy->dev);
>>> -    /* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
>>> -    if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
>>> -        clk_prepare_enable(phy->refclk);
>>> +
>>> +    /*
>>> +     * Prevent auto-disable of refclk for SATA PHY due to Errata i783
>>> +     */
>>> +    if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
>>> +        if (!IS_ERR(phy->refclk)) {
>>> +            clk_prepare_enable(phy->refclk);
>>> +            phy->sata_refclk_enabled = true;
>>> +        }
>>> +    }
>>>
>>>        generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>>>        if (IS_ERR(generic_phy))
>>> @@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3
>>> *phy)
>>>
>>>    static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>>>    {
>>> -    if (!IS_ERR(phy->refclk))
>>> +    if (!IS_ERR(phy->refclk)) {
>>>            clk_disable_unprepare(phy->refclk);
>>> +        /*
>>> +         * SATA refclk needs an additional disable as we left it
>>> +         * on in probe to avoid Errata i783
>>
>> not sure I get this. Why don't we remove it in probe?
>
> Because if we remove it from probe and if AHCI_PLATFORM is built as a
> module then phy_init won't be called before kernel starts autodisabling
> unused clocks and so SATA refclk gets disabled causing i783 and
> breaking SATA.

Just to be clear, this entire thing won't be required if uboot does 
SATA_PLL_SOFT_RESET no?

Thanks
Kishon

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Roger Quadros]

Kishon,

On 22/05/15 14:34, Kishon Vijay Abraham I wrote:
> Roger,
>
> On Wednesday 20 May 2015 07:17 PM, Roger Quadros wrote:
>> Kishon,
>>
>> On 20/05/15 16:19, Kishon Vijay Abraham I wrote:
>>> Hi Roger,
>>>
>>> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>>>> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
>>>> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>>>>
>>>> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
>>>> regmap access to this register which sits in the control module.
>>>>
>>>> If the register is not provided we fallback to the old behaviour
>>>> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
>>>> power states.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>> ---
>>>>    Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>>>>    drivers/phy/phy-ti-pipe3.c                       | 67
>>>> ++++++++++++++++++++----
>>>>    2 files changed, 74 insertions(+), 9 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>> b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>> index 305e3df..f0f5537 100644
>>>> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>> @@ -82,6 +82,9 @@ Optional properties:
>>>>     - id: If there are multiple instance of the same type, in order to
>>>>       differentiate between each instance "id" can be used (e.g.,
>>>> multi-lane PCIe
>>>>       PHY). If "id" is not provided, it is set to default value of '1'.
>>>> + - syscon-pllreset: Handle to system control region that contains the
>>>> +   CTRL_CORE_SMA_SW_0 register and register offset to the
>>>> CTRL_CORE_SMA_SW_0
>>>> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for
>>>> sata_phy.
>>>>
>>>>    This is usually a subnode of ocp2scp to which it is connected.
>>>>
>>>> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>>>>                "sysclk",
>>>>                "refclk";
>>>>    };
>>>> +
>>>> +sata_phy: phy@4A096000 {
>>>> +    compatible = "ti,phy-pipe3-sata";
>>>> +    reg = <0x4A096000 0x80>, /* phy_rx */
>>>> +          <0x4A096400 0x64>, /* phy_tx */
>>>> +          <0x4A096800 0x40>; /* pll_ctrl */
>>>> +    reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>>> +    ctrl-module = <&omap_control_sata>;
>>>> +    clocks = <&sys_clkin1>, <&sata_ref_clk>;
>>>> +    clock-names = "sysclk", "refclk";
>>>> +    syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>>>> +    #phy-cells = <0>;
>>>> +};
>>>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>>>> index e13a306..d730142 100644
>>>> --- a/drivers/phy/phy-ti-pipe3.c
>>>> +++ b/drivers/phy/phy-ti-pipe3.c
>>>> @@ -28,6 +28,8 @@
>>>>    #include <linux/delay.h>
>>>>    #include <linux/phy/omap_control_phy.h>
>>>>    #include <linux/of_platform.h>
>>>> +#include <linux/mfd/syscon.h>
>>>> +#include <linux/regmap.h>
>>>>
>>>>    #define    PLL_STATUS        0x00000004
>>>>    #define    PLL_GO            0x00000008
>>>> @@ -52,6 +54,8 @@
>>>>    #define    PLL_LOCK        0x2
>>>>    #define    PLL_IDLE        0x1
>>>>
>>>> +#define SATA_PLL_SOFT_RESET    BIT(18)
>>>> +
>>>>    /*
>>>>     * This is an Empirical value that works, need to confirm the actual
>>>>     * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
>>>> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>>>>        struct clk        *refclk;
>>>>        struct clk        *div_clk;
>>>>        struct pipe3_dpll_map    *dpll_map;
>>>> +    struct regmap        *dpll_reset_syscon; /* ctrl. reg. acces */
>>>> +    unsigned int        dpll_reset_reg; /* reg. index within syscon */
>>>> +    bool            sata_refclk_enabled;
>>>>    };
>>>>
>>>>    static struct pipe3_dpll_map dpll_map_usb[] = {
>>>> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>>>>        u32 val;
>>>>        unsigned long timeout;
>>>>
>>>> -    /* SATA DPLL can't be powered down due to Errata i783 and PCIe
>>>> -     * does not have internal DPLL
>>>> +    /* If dpll_reset_syscon is not present we wont power down SATA DPLL
>>>> +     * due to Errata i783
>>>>         */
>>>> -    if (of_device_is_compatible(phy->dev->of_node,
>>>> "ti,phy-pipe3-sata") ||
>>>> -        of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>>> "ti,phy-pipe3-sata") &&
>>>> +        !phy->dpll_reset_syscon)
>>>> +        return 0;
>>>> +
>>>> +    /* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
>>>
>>> I think it's better to fix it in this patch itself.. to disable clocks
>>> for PCIe.
>>>> +    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>>            return 0;
>>>>
>>>>        /* Put DPLL in IDLE mode */
>>>> @@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
>>>>            return -EBUSY;
>>>>        }
>>>>
>>>> +    /* i783: SATA needs control bit toggle after PLL unlock */
>>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>>> "ti,phy-pipe3-sata")) {
>>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>>> +                SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
>>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>>> +                SATA_PLL_SOFT_RESET, 0);
>>>> +    }
>>>> +
>>>>        ti_pipe3_disable_clocks(phy);
>>>>
>>>>        return 0;
>>>> @@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device
>>>> *pdev)
>>>>            }
>>>>        } else {
>>>>            phy->wkupclk = ERR_PTR(-ENODEV);
>>>> +        phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
>>>> +                            "syscon-pllreset");
>>>> +        if (IS_ERR(phy->dpll_reset_syscon)) {
>>>> +            dev_info(&pdev->dev,
>>>> +                 "can't get syscon-pllreset, sata dpll won't idle\n");
>>>> +            phy->dpll_reset_syscon = NULL;
>>>> +        } else {
>>>> +            if (of_property_read_u32_index(node,
>>>> +                               "syscon-pllreset", 1,
>>>> +                               &phy->dpll_reset_reg)) {
>>>> +                dev_err(&pdev->dev,
>>>> +                    "couldn't get pllreset reg. offset\n");
>>>> +                return -EINVAL;
>>>> +            }
>>>> +        }
>>>>        }
>>>>
>>>>        if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>>>> @@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device
>>>> *pdev)
>>>>
>>>>        platform_set_drvdata(pdev, phy);
>>>>        pm_runtime_enable(phy->dev);
>>>> -    /* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
>>>> -    if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
>>>> -        clk_prepare_enable(phy->refclk);
>>>> +
>>>> +    /*
>>>> +     * Prevent auto-disable of refclk for SATA PHY due to Errata i783
>>>> +     */
>>>> +    if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
>>>> +        if (!IS_ERR(phy->refclk)) {
>>>> +            clk_prepare_enable(phy->refclk);
>>>> +            phy->sata_refclk_enabled = true;
>>>> +        }
>>>> +    }
>>>>
>>>>        generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>>>>        if (IS_ERR(generic_phy))
>>>> @@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3
>>>> *phy)
>>>>
>>>>    static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>>>>    {
>>>> -    if (!IS_ERR(phy->refclk))
>>>> +    if (!IS_ERR(phy->refclk)) {
>>>>            clk_disable_unprepare(phy->refclk);
>>>> +        /*
>>>> +         * SATA refclk needs an additional disable as we left it
>>>> +         * on in probe to avoid Errata i783
>>>
>>> not sure I get this. Why don't we remove it in probe?
>>
>> Because if we remove it from probe and if AHCI_PLATFORM is built as a
>> module then phy_init won't be called before kernel starts autodisabling
>> unused clocks and so SATA refclk gets disabled causing i783 and
>> breaking SATA.
>
> Just to be clear, this entire thing won't be required if uboot does SATA_PLL_SOFT_RESET no?
>

Yes that is right. We don't yet have the u-boot fix and there is no guarantee all users move
to the u-boot with the fix, so this is important.

cheers,
-roger

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Kishon Vijay Abraham I]

Roger,

On Friday 22 May 2015 07:28 PM, Roger Quadros wrote:
> Kishon,
>
> On 22/05/15 14:34, Kishon Vijay Abraham I wrote:
>> Roger,
>>
>> On Wednesday 20 May 2015 07:17 PM, Roger Quadros wrote:
>>> Kishon,
>>>
>>> On 20/05/15 16:19, Kishon Vijay Abraham I wrote:
>>>> Hi Roger,
>>>>
>>>> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>>>>> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
>>>>> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>>>>>
>>>>> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
>>>>> regmap access to this register which sits in the control module.
>>>>>
>>>>> If the register is not provided we fallback to the old behaviour
>>>>> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
>>>>> power states.
>>>>>
>>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>>> ---
>>>>>     Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>>>>>     drivers/phy/phy-ti-pipe3.c                       | 67
>>>>> ++++++++++++++++++++----
>>>>>     2 files changed, 74 insertions(+), 9 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>> b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>> index 305e3df..f0f5537 100644
>>>>> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>> @@ -82,6 +82,9 @@ Optional properties:
>>>>>      - id: If there are multiple instance of the same type, in order to
>>>>>        differentiate between each instance "id" can be used (e.g.,
>>>>> multi-lane PCIe
>>>>>        PHY). If "id" is not provided, it is set to default value of '1'.
>>>>> + - syscon-pllreset: Handle to system control region that contains the
>>>>> +   CTRL_CORE_SMA_SW_0 register and register offset to the
>>>>> CTRL_CORE_SMA_SW_0
>>>>> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for
>>>>> sata_phy.
>>>>>
>>>>>     This is usually a subnode of ocp2scp to which it is connected.
>>>>>
>>>>> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>>>>>                 "sysclk",
>>>>>                 "refclk";
>>>>>     };
>>>>> +
>>>>> +sata_phy: phy@4A096000 {
>>>>> +    compatible = "ti,phy-pipe3-sata";
>>>>> +    reg = <0x4A096000 0x80>, /* phy_rx */
>>>>> +          <0x4A096400 0x64>, /* phy_tx */
>>>>> +          <0x4A096800 0x40>; /* pll_ctrl */
>>>>> +    reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>>>> +    ctrl-module = <&omap_control_sata>;
>>>>> +    clocks = <&sys_clkin1>, <&sata_ref_clk>;
>>>>> +    clock-names = "sysclk", "refclk";
>>>>> +    syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>>>>> +    #phy-cells = <0>;
>>>>> +};
>>>>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>>>>> index e13a306..d730142 100644
>>>>> --- a/drivers/phy/phy-ti-pipe3.c
>>>>> +++ b/drivers/phy/phy-ti-pipe3.c
>>>>> @@ -28,6 +28,8 @@
>>>>>     #include <linux/delay.h>
>>>>>     #include <linux/phy/omap_control_phy.h>
>>>>>     #include <linux/of_platform.h>
>>>>> +#include <linux/mfd/syscon.h>
>>>>> +#include <linux/regmap.h>
>>>>>
>>>>>     #define    PLL_STATUS        0x00000004
>>>>>     #define    PLL_GO            0x00000008
>>>>> @@ -52,6 +54,8 @@
>>>>>     #define    PLL_LOCK        0x2
>>>>>     #define    PLL_IDLE        0x1
>>>>>
>>>>> +#define SATA_PLL_SOFT_RESET    BIT(18)
>>>>> +
>>>>>     /*
>>>>>      * This is an Empirical value that works, need to confirm the actual
>>>>>      * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
>>>>> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>>>>>         struct clk        *refclk;
>>>>>         struct clk        *div_clk;
>>>>>         struct pipe3_dpll_map    *dpll_map;
>>>>> +    struct regmap        *dpll_reset_syscon; /* ctrl. reg. acces */
>>>>> +    unsigned int        dpll_reset_reg; /* reg. index within syscon */
>>>>> +    bool            sata_refclk_enabled;
>>>>>     };
>>>>>
>>>>>     static struct pipe3_dpll_map dpll_map_usb[] = {
>>>>> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>>>>>         u32 val;
>>>>>         unsigned long timeout;
>>>>>
>>>>> -    /* SATA DPLL can't be powered down due to Errata i783 and PCIe
>>>>> -     * does not have internal DPLL
>>>>> +    /* If dpll_reset_syscon is not present we wont power down SATA DPLL
>>>>> +     * due to Errata i783
>>>>>          */
>>>>> -    if (of_device_is_compatible(phy->dev->of_node,
>>>>> "ti,phy-pipe3-sata") ||
>>>>> -        of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>>>> "ti,phy-pipe3-sata") &&
>>>>> +        !phy->dpll_reset_syscon)
>>>>> +        return 0;
>>>>> +
>>>>> +    /* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
>>>>
>>>> I think it's better to fix it in this patch itself.. to disable clocks
>>>> for PCIe.
>>>>> +    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>>>             return 0;
>>>>>
>>>>>         /* Put DPLL in IDLE mode */
>>>>> @@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
>>>>>             return -EBUSY;
>>>>>         }
>>>>>
>>>>> +    /* i783: SATA needs control bit toggle after PLL unlock */
>>>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>>>> "ti,phy-pipe3-sata")) {
>>>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>>>> +                SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
>>>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>>>> +                SATA_PLL_SOFT_RESET, 0);
>>>>> +    }
>>>>> +
>>>>>         ti_pipe3_disable_clocks(phy);
>>>>>
>>>>>         return 0;
>>>>> @@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device
>>>>> *pdev)
>>>>>             }
>>>>>         } else {
>>>>>             phy->wkupclk = ERR_PTR(-ENODEV);
>>>>> +        phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
>>>>> +                            "syscon-pllreset");
>>>>> +        if (IS_ERR(phy->dpll_reset_syscon)) {
>>>>> +            dev_info(&pdev->dev,
>>>>> +                 "can't get syscon-pllreset, sata dpll won't idle\n");
>>>>> +            phy->dpll_reset_syscon = NULL;
>>>>> +        } else {
>>>>> +            if (of_property_read_u32_index(node,
>>>>> +                               "syscon-pllreset", 1,
>>>>> +                               &phy->dpll_reset_reg)) {
>>>>> +                dev_err(&pdev->dev,
>>>>> +                    "couldn't get pllreset reg. offset\n");
>>>>> +                return -EINVAL;
>>>>> +            }
>>>>> +        }
>>>>>         }
>>>>>
>>>>>         if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>>>>> @@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device
>>>>> *pdev)
>>>>>
>>>>>         platform_set_drvdata(pdev, phy);
>>>>>         pm_runtime_enable(phy->dev);
>>>>> -    /* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
>>>>> -    if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
>>>>> -        clk_prepare_enable(phy->refclk);
>>>>> +
>>>>> +    /*
>>>>> +     * Prevent auto-disable of refclk for SATA PHY due to Errata i783
>>>>> +     */
>>>>> +    if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
>>>>> +        if (!IS_ERR(phy->refclk)) {
>>>>> +            clk_prepare_enable(phy->refclk);
>>>>> +            phy->sata_refclk_enabled = true;
>>>>> +        }
>>>>> +    }
>>>>>
>>>>>         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>>>>>         if (IS_ERR(generic_phy))
>>>>> @@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3
>>>>> *phy)
>>>>>
>>>>>     static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>>>>>     {
>>>>> -    if (!IS_ERR(phy->refclk))
>>>>> +    if (!IS_ERR(phy->refclk)) {
>>>>>             clk_disable_unprepare(phy->refclk);
>>>>> +        /*
>>>>> +         * SATA refclk needs an additional disable as we left it
>>>>> +         * on in probe to avoid Errata i783
>>>>
>>>> not sure I get this. Why don't we remove it in probe?
>>>
>>> Because if we remove it from probe and if AHCI_PLATFORM is built as a
>>> module then phy_init won't be called before kernel starts autodisabling
>>> unused clocks and so SATA refclk gets disabled causing i783 and
>>> breaking SATA.
>>
>> Just to be clear, this entire thing won't be required if uboot does SATA_PLL_SOFT_RESET no?
>>
>
> Yes that is right. We don't yet have the u-boot fix and there is no guarantee all users move
> to the u-boot with the fix, so this is important.

Okay. Just thinking if we can do SATA_PLL_SOFT_RESET in probe to begin with. 
That way we don't have to do this additional clk_enable().

Thanks
Kishon

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Roger Quadros]

Kishon,

On 23/05/15 10:22, Kishon Vijay Abraham I wrote:
> Roger,
>
> On Friday 22 May 2015 07:28 PM, Roger Quadros wrote:
>> Kishon,
>>
>> On 22/05/15 14:34, Kishon Vijay Abraham I wrote:
>>> Roger,
>>>
>>> On Wednesday 20 May 2015 07:17 PM, Roger Quadros wrote:
>>>> Kishon,
>>>>
>>>> On 20/05/15 16:19, Kishon Vijay Abraham I wrote:
>>>>> Hi Roger,
>>>>>
>>>>> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>>>>>> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
>>>>>> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>>>>>>
>>>>>> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
>>>>>> regmap access to this register which sits in the control module.
>>>>>>
>>>>>> If the register is not provided we fallback to the old behaviour
>>>>>> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
>>>>>> power states.
>>>>>>
>>>>>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>>>>>> ---
>>>>>>     Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>>>>>>     drivers/phy/phy-ti-pipe3.c                       | 67
>>>>>> ++++++++++++++++++++----
>>>>>>     2 files changed, 74 insertions(+), 9 deletions(-)
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>>> b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>>> index 305e3df..f0f5537 100644
>>>>>> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>>> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
>>>>>> @@ -82,6 +82,9 @@ Optional properties:
>>>>>>      - id: If there are multiple instance of the same type, in order to
>>>>>>        differentiate between each instance "id" can be used (e.g.,
>>>>>> multi-lane PCIe
>>>>>>        PHY). If "id" is not provided, it is set to default value of '1'.
>>>>>> + - syscon-pllreset: Handle to system control region that contains the
>>>>>> +   CTRL_CORE_SMA_SW_0 register and register offset to the
>>>>>> CTRL_CORE_SMA_SW_0
>>>>>> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for
>>>>>> sata_phy.
>>>>>>
>>>>>>     This is usually a subnode of ocp2scp to which it is connected.
>>>>>>
>>>>>> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>>>>>>                 "sysclk",
>>>>>>                 "refclk";
>>>>>>     };
>>>>>> +
>>>>>> +sata_phy: phy@4A096000 {
>>>>>> +    compatible = "ti,phy-pipe3-sata";
>>>>>> +    reg = <0x4A096000 0x80>, /* phy_rx */
>>>>>> +          <0x4A096400 0x64>, /* phy_tx */
>>>>>> +          <0x4A096800 0x40>; /* pll_ctrl */
>>>>>> +    reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>>>>> +    ctrl-module = <&omap_control_sata>;
>>>>>> +    clocks = <&sys_clkin1>, <&sata_ref_clk>;
>>>>>> +    clock-names = "sysclk", "refclk";
>>>>>> +    syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>>>>>> +    #phy-cells = <0>;
>>>>>> +};
>>>>>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>>>>>> index e13a306..d730142 100644
>>>>>> --- a/drivers/phy/phy-ti-pipe3.c
>>>>>> +++ b/drivers/phy/phy-ti-pipe3.c
>>>>>> @@ -28,6 +28,8 @@
>>>>>>     #include <linux/delay.h>
>>>>>>     #include <linux/phy/omap_control_phy.h>
>>>>>>     #include <linux/of_platform.h>
>>>>>> +#include <linux/mfd/syscon.h>
>>>>>> +#include <linux/regmap.h>
>>>>>>
>>>>>>     #define    PLL_STATUS        0x00000004
>>>>>>     #define    PLL_GO            0x00000008
>>>>>> @@ -52,6 +54,8 @@
>>>>>>     #define    PLL_LOCK        0x2
>>>>>>     #define    PLL_IDLE        0x1
>>>>>>
>>>>>> +#define SATA_PLL_SOFT_RESET    BIT(18)
>>>>>> +
>>>>>>     /*
>>>>>>      * This is an Empirical value that works, need to confirm the actual
>>>>>>      * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
>>>>>> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>>>>>>         struct clk        *refclk;
>>>>>>         struct clk        *div_clk;
>>>>>>         struct pipe3_dpll_map    *dpll_map;
>>>>>> +    struct regmap        *dpll_reset_syscon; /* ctrl. reg. acces */
>>>>>> +    unsigned int        dpll_reset_reg; /* reg. index within syscon */
>>>>>> +    bool            sata_refclk_enabled;
>>>>>>     };
>>>>>>
>>>>>>     static struct pipe3_dpll_map dpll_map_usb[] = {
>>>>>> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>>>>>>         u32 val;
>>>>>>         unsigned long timeout;
>>>>>>
>>>>>> -    /* SATA DPLL can't be powered down due to Errata i783 and PCIe
>>>>>> -     * does not have internal DPLL
>>>>>> +    /* If dpll_reset_syscon is not present we wont power down SATA DPLL
>>>>>> +     * due to Errata i783
>>>>>>          */
>>>>>> -    if (of_device_is_compatible(phy->dev->of_node,
>>>>>> "ti,phy-pipe3-sata") ||
>>>>>> -        of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>>>>> "ti,phy-pipe3-sata") &&
>>>>>> +        !phy->dpll_reset_syscon)
>>>>>> +        return 0;
>>>>>> +
>>>>>> +    /* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
>>>>>
>>>>> I think it's better to fix it in this patch itself.. to disable clocks
>>>>> for PCIe.
>>>>>> +    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>>>>>>             return 0;
>>>>>>
>>>>>>         /* Put DPLL in IDLE mode */
>>>>>> @@ -276,6 +287,14 @@ static int ti_pipe3_exit(struct phy *x)
>>>>>>             return -EBUSY;
>>>>>>         }
>>>>>>
>>>>>> +    /* i783: SATA needs control bit toggle after PLL unlock */
>>>>>> +    if (of_device_is_compatible(phy->dev->of_node,
>>>>>> "ti,phy-pipe3-sata")) {
>>>>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>>>>> +                SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET);
>>>>>> +        regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg,
>>>>>> +                SATA_PLL_SOFT_RESET, 0);
>>>>>> +    }
>>>>>> +
>>>>>>         ti_pipe3_disable_clocks(phy);
>>>>>>
>>>>>>         return 0;
>>>>>> @@ -350,6 +369,21 @@ static int ti_pipe3_probe(struct platform_device
>>>>>> *pdev)
>>>>>>             }
>>>>>>         } else {
>>>>>>             phy->wkupclk = ERR_PTR(-ENODEV);
>>>>>> +        phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node,
>>>>>> +                            "syscon-pllreset");
>>>>>> +        if (IS_ERR(phy->dpll_reset_syscon)) {
>>>>>> +            dev_info(&pdev->dev,
>>>>>> +                 "can't get syscon-pllreset, sata dpll won't idle\n");
>>>>>> +            phy->dpll_reset_syscon = NULL;
>>>>>> +        } else {
>>>>>> +            if (of_property_read_u32_index(node,
>>>>>> +                               "syscon-pllreset", 1,
>>>>>> +                               &phy->dpll_reset_reg)) {
>>>>>> +                dev_err(&pdev->dev,
>>>>>> +                    "couldn't get pllreset reg. offset\n");
>>>>>> +                return -EINVAL;
>>>>>> +            }
>>>>>> +        }
>>>>>>         }
>>>>>>
>>>>>>         if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
>>>>>> @@ -402,9 +436,16 @@ static int ti_pipe3_probe(struct platform_device
>>>>>> *pdev)
>>>>>>
>>>>>>         platform_set_drvdata(pdev, phy);
>>>>>>         pm_runtime_enable(phy->dev);
>>>>>> -    /* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
>>>>>> -    if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
>>>>>> -        clk_prepare_enable(phy->refclk);
>>>>>> +
>>>>>> +    /*
>>>>>> +     * Prevent auto-disable of refclk for SATA PHY due to Errata i783
>>>>>> +     */
>>>>>> +    if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
>>>>>> +        if (!IS_ERR(phy->refclk)) {
>>>>>> +            clk_prepare_enable(phy->refclk);
>>>>>> +            phy->sata_refclk_enabled = true;
>>>>>> +        }
>>>>>> +    }
>>>>>>
>>>>>>         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
>>>>>>         if (IS_ERR(generic_phy))
>>>>>> @@ -443,8 +484,17 @@ static int ti_pipe3_enable_refclk(struct ti_pipe3
>>>>>> *phy)
>>>>>>
>>>>>>     static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
>>>>>>     {
>>>>>> -    if (!IS_ERR(phy->refclk))
>>>>>> +    if (!IS_ERR(phy->refclk)) {
>>>>>>             clk_disable_unprepare(phy->refclk);
>>>>>> +        /*
>>>>>> +         * SATA refclk needs an additional disable as we left it
>>>>>> +         * on in probe to avoid Errata i783
>>>>>
>>>>> not sure I get this. Why don't we remove it in probe?
>>>>
>>>> Because if we remove it from probe and if AHCI_PLATFORM is built as a
>>>> module then phy_init won't be called before kernel starts autodisabling
>>>> unused clocks and so SATA refclk gets disabled causing i783 and
>>>> breaking SATA.
>>>
>>> Just to be clear, this entire thing won't be required if uboot does SATA_PLL_SOFT_RESET no?
>>>
>>
>> Yes that is right. We don't yet have the u-boot fix and there is no guarantee all users move
>> to the u-boot with the fix, so this is important.
>
> Okay. Just thinking if we can do SATA_PLL_SOFT_RESET in probe to begin with. That way we don't have to do this additional clk_enable().
>

I had tried it but it didn't work.

cheers,
-roger

Re: [PATCH 2/3] phy: ti-pipe3: i783 workaround for SATA lockup after dpll unlock/relock

[Roger Quadros]

Kishon,

On 20/05/15 16:19, Kishon Vijay Abraham I wrote:
> Hi Roger,
>
> On Tuesday 12 May 2015 09:37 PM, Roger Quadros wrote:
>> SATA_PLL_SOFT_RESET bit of CTRL_CORE_SMA_SW_0 must be toggled
>> between a SATA DPLL unlock and re-lock to prevent SATA lockup.
>>
>> Introduce a new DT parameter 'syscon-pllreset' to provide the syscon
>> regmap access to this register which sits in the control module.
>>
>> If the register is not provided we fallback to the old behaviour
>> i.e. SATA DPLL refclk will not be disabled and we prevent SoC low
>> power states.
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> ---
>>   Documentation/devicetree/bindings/phy/ti-phy.txt | 16 ++++++
>>   drivers/phy/phy-ti-pipe3.c                       | 67 ++++++++++++++++++++----
>>   2 files changed, 74 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
>> index 305e3df..f0f5537 100644
>> --- a/Documentation/devicetree/bindings/phy/ti-phy.txt
>> +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
>> @@ -82,6 +82,9 @@ Optional properties:
>>    - id: If there are multiple instance of the same type, in order to
>>      differentiate between each instance "id" can be used (e.g., multi-lane PCIe
>>      PHY). If "id" is not provided, it is set to default value of '1'.
>> + - syscon-pllreset: Handle to system control region that contains the
>> +   CTRL_CORE_SMA_SW_0 register and register offset to the CTRL_CORE_SMA_SW_0
>> +   register that contains the SATA_PLL_SOFT_RESET bit. Only valid for sata_phy.
>>
>>   This is usually a subnode of ocp2scp to which it is connected.
>>
>> @@ -100,3 +103,16 @@ usb3phy@4a084400 {
>>               "sysclk",
>>               "refclk";
>>   };
>> +
>> +sata_phy: phy@4A096000 {
>> +    compatible = "ti,phy-pipe3-sata";
>> +    reg = <0x4A096000 0x80>, /* phy_rx */
>> +          <0x4A096400 0x64>, /* phy_tx */
>> +          <0x4A096800 0x40>; /* pll_ctrl */
>> +    reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>> +    ctrl-module = <&omap_control_sata>;
>> +    clocks = <&sys_clkin1>, <&sata_ref_clk>;
>> +    clock-names = "sysclk", "refclk";
>> +    syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>> +    #phy-cells = <0>;
>> +};
>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>> index e13a306..d730142 100644
>> --- a/drivers/phy/phy-ti-pipe3.c
>> +++ b/drivers/phy/phy-ti-pipe3.c
>> @@ -28,6 +28,8 @@
>>   #include <linux/delay.h>
>>   #include <linux/phy/omap_control_phy.h>
>>   #include <linux/of_platform.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/regmap.h>
>>
>>   #define    PLL_STATUS        0x00000004
>>   #define    PLL_GO            0x00000008
>> @@ -52,6 +54,8 @@
>>   #define    PLL_LOCK        0x2
>>   #define    PLL_IDLE        0x1
>>
>> +#define SATA_PLL_SOFT_RESET    BIT(18)
>> +
>>   /*
>>    * This is an Empirical value that works, need to confirm the actual
>>    * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
>> @@ -82,6 +86,9 @@ struct ti_pipe3 {
>>       struct clk        *refclk;
>>       struct clk        *div_clk;
>>       struct pipe3_dpll_map    *dpll_map;
>> +    struct regmap        *dpll_reset_syscon; /* ctrl. reg. acces */
>> +    unsigned int        dpll_reset_reg; /* reg. index within syscon */
>> +    bool            sata_refclk_enabled;
>>   };
>>
>>   static struct pipe3_dpll_map dpll_map_usb[] = {
>> @@ -249,11 +256,15 @@ static int ti_pipe3_exit(struct phy *x)
>>       u32 val;
>>       unsigned long timeout;
>>
>> -    /* SATA DPLL can't be powered down due to Errata i783 and PCIe
>> -     * does not have internal DPLL
>> +    /* If dpll_reset_syscon is not present we wont power down SATA DPLL
>> +     * due to Errata i783
>>        */
>> -    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") ||
>> -        of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
>> +    if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") &&
>> +        !phy->dpll_reset_syscon)
>> +        return 0;
>> +
>> +    /* PCIe doesn't have DPLL. FIXME: need to disable clocks though */
>
> I think it's better to fix it in this patch itself.. to disable clocks for PCIe.

I was not sure if it will break PCIe in any way. moreover it is not part of the patch subject.
do you still want me to fix it in this patch?

cheers,
-roger

[PATCH 3/3] ARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY

[Roger Quadros]

This register is required to be passed to the SATA PHY driver
to workaround errata i783 (SATA Lockup After SATA DPLL Unlock/Relock).

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
 arch/arm/boot/dts/dra7.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index f03a091..260f300 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -1135,6 +1135,7 @@
 				ctrl-module = <&omap_control_sata>;
 				clocks = <&sys_clkin1>, <&sata_ref_clk>;
 				clock-names = "sysclk", "refclk";
+				syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
 				#phy-cells = <0>;
 			};
 
-- 
2.1.4

Re: [PATCH 3/3] ARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY

[Tony Lindgren]

* Roger Quadros <rogerq@ti.com> [150512 09:08]:
> This register is required to be passed to the SATA PHY driver
> to workaround errata i783 (SATA Lockup After SATA DPLL Unlock/Relock).
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
> ---
>  arch/arm/boot/dts/dra7.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> index f03a091..260f300 100644
> --- a/arch/arm/boot/dts/dra7.dtsi
> +++ b/arch/arm/boot/dts/dra7.dtsi
> @@ -1135,6 +1135,7 @@
>  				ctrl-module = <&omap_control_sata>;
>  				clocks = <&sys_clkin1>, <&sata_ref_clk>;
>  				clock-names = "sysclk", "refclk";
> +				syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>  				#phy-cells = <0>;
>  			};
>  

Looks like this one is still pending driver changes, please
resend when those are resolved. I'll untag this one for now.

Regards,

Tony

Re: [PATCH 3/3] ARM: dts: dra7: Add syscon-pllreset syscon to SATA PHY

[Roger Quadros]

On 14/07/15 13:34, Tony Lindgren wrote:
> * Roger Quadros <rogerq@ti.com> [150512 09:08]:
>> This register is required to be passed to the SATA PHY driver
>> to workaround errata i783 (SATA Lockup After SATA DPLL Unlock/Relock).
>>
>> Signed-off-by: Roger Quadros <rogerq@ti.com>
>> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
>> ---
>>  arch/arm/boot/dts/dra7.dtsi | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>> index f03a091..260f300 100644
>> --- a/arch/arm/boot/dts/dra7.dtsi
>> +++ b/arch/arm/boot/dts/dra7.dtsi
>> @@ -1135,6 +1135,7 @@
>>  				ctrl-module = <&omap_control_sata>;
>>  				clocks = <&sys_clkin1>, <&sata_ref_clk>;
>>  				clock-names = "sysclk", "refclk";
>> +				syscon-pllreset = <&dra7_ctrl_core 0x3fc>;
>>  				#phy-cells = <0>;
>>  			};
>>  
> 
> Looks like this one is still pending driver changes, please
> resend when those are resolved. I'll untag this one for now.

I've sent a v2 of this series here
http://thread.gmane.org/gmane.linux.kernel/1967419

cheers,
-roger