Re: [PATCH 2/2] phy: ti-pipe3: Fix SATA across suspend/resume

Re: [PATCH 2/2] phy: ti-pipe3: Fix SATA across suspend/resume

[Kishon Vijay Abraham I]

Hi Roger,

On Friday 19 December 2014 05:35 PM, Roger Quadros wrote:
> Failed test case: Boot without SATA drive connected. Suspend/resume
> the board and then connect SATA drive. It fails to enumerate.
> 
> Due to Errata i783 "SATA Lockup After SATA DPLL Unlock/Relock"
> we can't allow SATA DPLL to be in the unlocked state.
> The SATA refclk (sata_ref_clk) is the source of the SATA_DPLL.
> Till now this clock was controlled by the AHCI SATA driver and was being
> shut off  during system suspend (if the SATA drive was not already attached)
> causing the SATA DPLL to be unlocked and so causing errata i783.
> 
> To prevent sata_ref_clk from being disabled, we move the control of
> this clock from the SATA AHCI driver to the SATA PHY driver and prevent
> it from being disabled.
> 
> This also fixes the issue of SATA not working on OMAP5/DRA7 when
> AHCI platform driver is built as a module.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
>  arch/arm/boot/dts/dra7.dtsi  |  4 ++--
>  arch/arm/boot/dts/omap5.dtsi |  4 ++--
>  drivers/phy/phy-ti-pipe3.c   | 53 +++++++++++++++++++++++++++++++-------------
>  3 files changed, 41 insertions(+), 20 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> index 63bf99b..8c35b84 100644
> --- a/arch/arm/boot/dts/dra7.dtsi
> +++ b/arch/arm/boot/dts/dra7.dtsi
> @@ -1090,8 +1090,8 @@
>  				      <0x4A096800 0x40>; /* pll_ctrl */
>  				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>  				ctrl-module = <&omap_control_sata>;
> -				clocks = <&sys_clkin1>;
> -				clock-names = "sysclk";
> +				clocks = <&sys_clkin1>, <&sata_ref_clk>;
> +				clock-names = "sysclk", "refclk";
>  				#phy-cells = <0>;
>  			};
>  
> diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
> index b321fdf..bb498e7 100644
> --- a/arch/arm/boot/dts/omap5.dtsi
> +++ b/arch/arm/boot/dts/omap5.dtsi
> @@ -929,8 +929,8 @@
>  				      <0x4A096800 0x40>; /* pll_ctrl */
>  				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>  				ctrl-module = <&omap_control_sata>;
> -				clocks = <&sys_clkin>;
> -				clock-names = "sysclk";
> +				clocks = <&sys_clkin>, <&sata_ref_clk>;
> +				clock-names = "sysclk", "refclk";
>  				#phy-cells = <0>;
>  			};
>  		};
> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
> index e60ff14..e08edd9 100644
> --- a/drivers/phy/phy-ti-pipe3.c
> +++ b/drivers/phy/phy-ti-pipe3.c
> @@ -85,6 +85,7 @@ struct ti_pipe3 {
>  	struct pipe3_dpll_map	*dpll_map;
>  	u8			id;
>  	bool enabled;
> +	bool refclk_enabled;	/* this flag is needed specifically for SATA */
>  	spinlock_t lock;	/* serialize clock enable/disable */
>  };
>  
> @@ -333,21 +334,20 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	phy->refclk = devm_clk_get(phy->dev, "refclk");
> +	if (IS_ERR(phy->refclk)) {
> +		dev_err(&pdev->dev, "unable to get refclk\n");
> +		return PTR_ERR(phy->refclk);
> +	}

This will break older dtbs. AFAIK, newer kernels should be compatible with
older dtbs too. cc'ed devicetree@vger.kernel.org for clarification.

Thanks
Kishon

Re: [PATCH 2/2] phy: ti-pipe3: Fix SATA across suspend/resume

[Roger Quadros]

On 22/12/14 15:52, Kishon Vijay Abraham I wrote:
> Hi Roger,
> 
> On Friday 19 December 2014 05:35 PM, Roger Quadros wrote:
>> Failed test case: Boot without SATA drive connected. Suspend/resume
>> the board and then connect SATA drive. It fails to enumerate.
>>
>> Due to Errata i783 "SATA Lockup After SATA DPLL Unlock/Relock"
>> we can't allow SATA DPLL to be in the unlocked state.
>> The SATA refclk (sata_ref_clk) is the source of the SATA_DPLL.
>> Till now this clock was controlled by the AHCI SATA driver and was being
>> shut off  during system suspend (if the SATA drive was not already attached)
>> causing the SATA DPLL to be unlocked and so causing errata i783.
>>
>> To prevent sata_ref_clk from being disabled, we move the control of
>> this clock from the SATA AHCI driver to the SATA PHY driver and prevent
>> it from being disabled.
>>
>> This also fixes the issue of SATA not working on OMAP5/DRA7 when
>> AHCI platform driver is built as a module.
>>
>> Signed-off-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
>> ---
>>  arch/arm/boot/dts/dra7.dtsi  |  4 ++--
>>  arch/arm/boot/dts/omap5.dtsi |  4 ++--
>>  drivers/phy/phy-ti-pipe3.c   | 53 +++++++++++++++++++++++++++++++-------------
>>  3 files changed, 41 insertions(+), 20 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>> index 63bf99b..8c35b84 100644
>> --- a/arch/arm/boot/dts/dra7.dtsi
>> +++ b/arch/arm/boot/dts/dra7.dtsi
>> @@ -1090,8 +1090,8 @@
>>  				      <0x4A096800 0x40>; /* pll_ctrl */
>>  				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>  				ctrl-module = <&omap_control_sata>;
>> -				clocks = <&sys_clkin1>;
>> -				clock-names = "sysclk";
>> +				clocks = <&sys_clkin1>, <&sata_ref_clk>;
>> +				clock-names = "sysclk", "refclk";
>>  				#phy-cells = <0>;
>>  			};
>>  
>> diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
>> index b321fdf..bb498e7 100644
>> --- a/arch/arm/boot/dts/omap5.dtsi
>> +++ b/arch/arm/boot/dts/omap5.dtsi
>> @@ -929,8 +929,8 @@
>>  				      <0x4A096800 0x40>; /* pll_ctrl */
>>  				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>>  				ctrl-module = <&omap_control_sata>;
>> -				clocks = <&sys_clkin>;
>> -				clock-names = "sysclk";
>> +				clocks = <&sys_clkin>, <&sata_ref_clk>;
>> +				clock-names = "sysclk", "refclk";
>>  				#phy-cells = <0>;
>>  			};
>>  		};
>> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
>> index e60ff14..e08edd9 100644
>> --- a/drivers/phy/phy-ti-pipe3.c
>> +++ b/drivers/phy/phy-ti-pipe3.c
>> @@ -85,6 +85,7 @@ struct ti_pipe3 {
>>  	struct pipe3_dpll_map	*dpll_map;
>>  	u8			id;
>>  	bool enabled;
>> +	bool refclk_enabled;	/* this flag is needed specifically for SATA */
>>  	spinlock_t lock;	/* serialize clock enable/disable */
>>  };
>>  
>> @@ -333,21 +334,20 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>>  		}
>>  	}
>>  
>> +	phy->refclk = devm_clk_get(phy->dev, "refclk");
>> +	if (IS_ERR(phy->refclk)) {
>> +		dev_err(&pdev->dev, "unable to get refclk\n");
>> +		return PTR_ERR(phy->refclk);
>> +	}
> 
> This will break older dtbs. AFAIK, newer kernels should be compatible with
> older dtbs too. cc'ed devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org for clarification.

If I make refclk optional that still leaves SATA broken on older dtbs. Wouldn't it be better to fix the DTBs via stable instead?

cheers,
-roger
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[PATCH v2 2/2] phy: ti-pipe3: Fix SATA across suspend/resume

[Roger Quadros]

Failed test case: Boot without SATA drive connected. Suspend/resume
the board and then connect SATA drive. It fails to enumerate.

Due to Errata i783 "SATA Lockup After SATA DPLL Unlock/Relock"
we can't allow SATA DPLL to be in the unlocked state.
The SATA refclk (sata_ref_clk) is the source of the SATA_DPLL.
Till now this clock was controlled by the AHCI SATA driver and was being
shut off  during system suspend (if the SATA drive was not already attached)
causing the SATA DPLL to be unlocked and so causing errata i783.

To prevent sata_ref_clk from being disabled, we move the control of
this clock from the SATA AHCI driver to the SATA PHY driver and prevent
it from being disabled.

This also fixes the issue of SATA not working on OMAP5/DRA7 when
AHCI platform driver is built as a module.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
v2: don't bail out for missing refclk on SATA phy to work with older broken DTBs.

 arch/arm/boot/dts/dra7.dtsi  |  4 ++--
 arch/arm/boot/dts/omap5.dtsi |  4 ++--
 drivers/phy/phy-ti-pipe3.c   | 57 +++++++++++++++++++++++++++++++-------------
 3 files changed, 45 insertions(+), 20 deletions(-)

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index 22771bc..8d2a635 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -1090,8 +1090,8 @@
 				      <0x4A096800 0x40>; /* pll_ctrl */
 				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
 				ctrl-module = <&omap_control_sata>;
-				clocks = <&sys_clkin1>;
-				clock-names = "sysclk";
+				clocks = <&sys_clkin1>, <&sata_ref_clk>;
+				clock-names = "sysclk", "refclk";
 				#phy-cells = <0>;
 			};
 
diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
index b321fdf..bb498e7 100644
--- a/arch/arm/boot/dts/omap5.dtsi
+++ b/arch/arm/boot/dts/omap5.dtsi
@@ -929,8 +929,8 @@
 				      <0x4A096800 0x40>; /* pll_ctrl */
 				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
 				ctrl-module = <&omap_control_sata>;
-				clocks = <&sys_clkin>;
-				clock-names = "sysclk";
+				clocks = <&sys_clkin>, <&sata_ref_clk>;
+				clock-names = "sysclk", "refclk";
 				#phy-cells = <0>;
 			};
 		};
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index e60ff14..456dec2 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -85,6 +85,7 @@ struct ti_pipe3 {
 	struct pipe3_dpll_map	*dpll_map;
 	u8			id;
 	bool enabled;
+	bool refclk_enabled;	/* this flag is needed specifically for SATA */
 	spinlock_t lock;	/* serialize clock enable/disable */
 };
 
@@ -333,21 +334,24 @@ static int ti_pipe3_probe(struct platform_device *pdev)
 		}
 	}
 
+	phy->refclk = devm_clk_get(phy->dev, "refclk");
+	if (IS_ERR(phy->refclk)) {
+		dev_err(&pdev->dev, "unable to get refclk\n");
+		/* older DTBs have missing refclk in SATA PHY
+		 * so don't bail out in case of SATA PHY.
+		 */
+		if (!of_device_is_compatible(node, "ti,phy-pipe3-sata"))
+			return PTR_ERR(phy->refclk);
+	}
+
 	if (!of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
 		phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 		if (IS_ERR(phy->wkupclk)) {
 			dev_err(&pdev->dev, "unable to get wkupclk\n");
 			return PTR_ERR(phy->wkupclk);
 		}
-
-		phy->refclk = devm_clk_get(phy->dev, "refclk");
-		if (IS_ERR(phy->refclk)) {
-			dev_err(&pdev->dev, "unable to get refclk\n");
-			return PTR_ERR(phy->refclk);
-		}
 	} else {
 		phy->wkupclk = ERR_PTR(-ENODEV);
-		phy->refclk = ERR_PTR(-ENODEV);
 	}
 
 	if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
@@ -428,6 +432,29 @@ static int ti_pipe3_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
+static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
+{
+	if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
+		int ret;
+
+		ret = clk_prepare_enable(phy->refclk);
+		if (ret) {
+			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
+			return ret;
+		}
+		phy->refclk_enabled = true;
+	}
+
+	return 0;
+}
+
+static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
+{
+	if (!IS_ERR(phy->refclk))
+		clk_disable_unprepare(phy->refclk);
+
+	phy->refclk_enabled = false;
+}
 
 static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
 {
@@ -438,13 +465,9 @@ static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
 	if (phy->enabled)
 		goto err1;
 
-	if (!IS_ERR(phy->refclk)) {
-		ret = clk_prepare_enable(phy->refclk);
-		if (ret) {
-			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
-			goto err1;
-		}
-	}
+	ret = ti_pipe3_enable_refclk(phy);
+	if (ret)
+		goto err1;
 
 	if (!IS_ERR(phy->wkupclk)) {
 		ret = clk_prepare_enable(phy->wkupclk);
@@ -474,6 +497,7 @@ err2:
 	if (!IS_ERR(phy->refclk))
 		clk_disable_unprepare(phy->refclk);
 
+	ti_pipe3_disable_refclk(phy);
 err1:
 	spin_unlock_irqrestore(&phy->lock, flags);
 	return ret;
@@ -491,8 +515,9 @@ static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy)
 
 	if (!IS_ERR(phy->wkupclk))
 		clk_disable_unprepare(phy->wkupclk);
-	if (!IS_ERR(phy->refclk))
-		clk_disable_unprepare(phy->refclk);
+	/* Don't disable refclk for SATA PHY due to Errata i783 */
+	if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata"))
+		ti_pipe3_disable_refclk(phy);
 	if (!IS_ERR(phy->div_clk))
 		clk_disable_unprepare(phy->div_clk);
 	phy->enabled = false;
-- 
2.1.0

Re: [PATCH v2 2/2] phy: ti-pipe3: Fix SATA across suspend/resume

[Kishon Vijay Abraham I]

Hi Roger,

On Thursday 08 January 2015 04:47 PM, Roger Quadros wrote:
> Failed test case: Boot without SATA drive connected. Suspend/resume
> the board and then connect SATA drive. It fails to enumerate.
> 
> Due to Errata i783 "SATA Lockup After SATA DPLL Unlock/Relock"
> we can't allow SATA DPLL to be in the unlocked state.
> The SATA refclk (sata_ref_clk) is the source of the SATA_DPLL.
> Till now this clock was controlled by the AHCI SATA driver and was being
> shut off  during system suspend (if the SATA drive was not already attached)
> causing the SATA DPLL to be unlocked and so causing errata i783.
> 
> To prevent sata_ref_clk from being disabled, we move the control of
> this clock from the SATA AHCI driver to the SATA PHY driver and prevent
> it from being disabled.
> 
> This also fixes the issue of SATA not working on OMAP5/DRA7 when
> AHCI platform driver is built as a module.

I feel the dt patches and the PHY patches can go separately. Can you split and
re-send?

Thanks
Kishon

> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
> v2: don't bail out for missing refclk on SATA phy to work with older broken DTBs.
> 
>  arch/arm/boot/dts/dra7.dtsi  |  4 ++--
>  arch/arm/boot/dts/omap5.dtsi |  4 ++--
>  drivers/phy/phy-ti-pipe3.c   | 57 +++++++++++++++++++++++++++++++-------------
>  3 files changed, 45 insertions(+), 20 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> index 22771bc..8d2a635 100644
> --- a/arch/arm/boot/dts/dra7.dtsi
> +++ b/arch/arm/boot/dts/dra7.dtsi
> @@ -1090,8 +1090,8 @@
>  				      <0x4A096800 0x40>; /* pll_ctrl */
>  				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>  				ctrl-module = <&omap_control_sata>;
> -				clocks = <&sys_clkin1>;
> -				clock-names = "sysclk";
> +				clocks = <&sys_clkin1>, <&sata_ref_clk>;
> +				clock-names = "sysclk", "refclk";
>  				#phy-cells = <0>;
>  			};
>  
> diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
> index b321fdf..bb498e7 100644
> --- a/arch/arm/boot/dts/omap5.dtsi
> +++ b/arch/arm/boot/dts/omap5.dtsi
> @@ -929,8 +929,8 @@
>  				      <0x4A096800 0x40>; /* pll_ctrl */
>  				reg-names = "phy_rx", "phy_tx", "pll_ctrl";
>  				ctrl-module = <&omap_control_sata>;
> -				clocks = <&sys_clkin>;
> -				clock-names = "sysclk";
> +				clocks = <&sys_clkin>, <&sata_ref_clk>;
> +				clock-names = "sysclk", "refclk";
>  				#phy-cells = <0>;
>  			};
>  		};
> diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
> index e60ff14..456dec2 100644
> --- a/drivers/phy/phy-ti-pipe3.c
> +++ b/drivers/phy/phy-ti-pipe3.c
> @@ -85,6 +85,7 @@ struct ti_pipe3 {
>  	struct pipe3_dpll_map	*dpll_map;
>  	u8			id;
>  	bool enabled;
> +	bool refclk_enabled;	/* this flag is needed specifically for SATA */
>  	spinlock_t lock;	/* serialize clock enable/disable */
>  };
>  
> @@ -333,21 +334,24 @@ static int ti_pipe3_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	phy->refclk = devm_clk_get(phy->dev, "refclk");
> +	if (IS_ERR(phy->refclk)) {
> +		dev_err(&pdev->dev, "unable to get refclk\n");
> +		/* older DTBs have missing refclk in SATA PHY
> +		 * so don't bail out in case of SATA PHY.
> +		 */
> +		if (!of_device_is_compatible(node, "ti,phy-pipe3-sata"))
> +			return PTR_ERR(phy->refclk);
> +	}
> +
>  	if (!of_device_is_compatible(node, "ti,phy-pipe3-sata")) {
>  		phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
>  		if (IS_ERR(phy->wkupclk)) {
>  			dev_err(&pdev->dev, "unable to get wkupclk\n");
>  			return PTR_ERR(phy->wkupclk);
>  		}
> -
> -		phy->refclk = devm_clk_get(phy->dev, "refclk");
> -		if (IS_ERR(phy->refclk)) {
> -			dev_err(&pdev->dev, "unable to get refclk\n");
> -			return PTR_ERR(phy->refclk);
> -		}
>  	} else {
>  		phy->wkupclk = ERR_PTR(-ENODEV);
> -		phy->refclk = ERR_PTR(-ENODEV);
>  	}
>  
>  	if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
> @@ -428,6 +432,29 @@ static int ti_pipe3_remove(struct platform_device *pdev)
>  }
>  
>  #ifdef CONFIG_PM
> +static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
> +{
> +	if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
> +		int ret;
> +
> +		ret = clk_prepare_enable(phy->refclk);
> +		if (ret) {
> +			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
> +			return ret;
> +		}
> +		phy->refclk_enabled = true;
> +	}
> +
> +	return 0;
> +}
> +
> +static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
> +{
> +	if (!IS_ERR(phy->refclk))
> +		clk_disable_unprepare(phy->refclk);
> +
> +	phy->refclk_enabled = false;
> +}
>  
>  static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
>  {
> @@ -438,13 +465,9 @@ static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
>  	if (phy->enabled)
>  		goto err1;
>  
> -	if (!IS_ERR(phy->refclk)) {
> -		ret = clk_prepare_enable(phy->refclk);
> -		if (ret) {
> -			dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
> -			goto err1;
> -		}
> -	}
> +	ret = ti_pipe3_enable_refclk(phy);
> +	if (ret)
> +		goto err1;
>  
>  	if (!IS_ERR(phy->wkupclk)) {
>  		ret = clk_prepare_enable(phy->wkupclk);
> @@ -474,6 +497,7 @@ err2:
>  	if (!IS_ERR(phy->refclk))
>  		clk_disable_unprepare(phy->refclk);
>  
> +	ti_pipe3_disable_refclk(phy);
>  err1:
>  	spin_unlock_irqrestore(&phy->lock, flags);
>  	return ret;
> @@ -491,8 +515,9 @@ static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy)
>  
>  	if (!IS_ERR(phy->wkupclk))
>  		clk_disable_unprepare(phy->wkupclk);
> -	if (!IS_ERR(phy->refclk))
> -		clk_disable_unprepare(phy->refclk);
> +	/* Don't disable refclk for SATA PHY due to Errata i783 */
> +	if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata"))
> +		ti_pipe3_disable_refclk(phy);
>  	if (!IS_ERR(phy->div_clk))
>  		clk_disable_unprepare(phy->div_clk);
>  	phy->enabled = false;
> 

Re: [PATCH v2 2/2] phy: ti-pipe3: Fix SATA across suspend/resume

[Roger Quadros]

On 09/01/15 15:59, Kishon Vijay Abraham I wrote:
> Hi Roger,
> 
> On Thursday 08 January 2015 04:47 PM, Roger Quadros wrote:
>> Failed test case: Boot without SATA drive connected. Suspend/resume
>> the board and then connect SATA drive. It fails to enumerate.
>>
>> Due to Errata i783 "SATA Lockup After SATA DPLL Unlock/Relock"
>> we can't allow SATA DPLL to be in the unlocked state.
>> The SATA refclk (sata_ref_clk) is the source of the SATA_DPLL.
>> Till now this clock was controlled by the AHCI SATA driver and was being
>> shut off  during system suspend (if the SATA drive was not already attached)
>> causing the SATA DPLL to be unlocked and so causing errata i783.
>>
>> To prevent sata_ref_clk from being disabled, we move the control of
>> this clock from the SATA AHCI driver to the SATA PHY driver and prevent
>> it from being disabled.
>>
>> This also fixes the issue of SATA not working on OMAP5/DRA7 when
>> AHCI platform driver is built as a module.
> 
> I feel the dt patches and the PHY patches can go separately. Can you split and
> re-send?

OK. will re-send.

cheers,
-roger