[PATCH v2 1/5] sata, highbank: fix ordering of SGPIO signals

[PATCH v2 1/5] sata, highbank: fix ordering of SGPIO signals

[Mark Langsdorf]

The ACTIVITY and ERROR signals were reversed in the original commit.
Fix that so that hard drive activity does not show up on the error
light, and attempts to indicate that the hard drive is failing do
not show up as hard drive activity. There is no other change to
the driver other than sending the signals to the LED PIC in the
correct order.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
---
Changes from v1
	Expanded commit message explaining the problems with the
unpatched code.

 drivers/ata/sata_highbank.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index d047d92..e9a4f46 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -86,11 +86,11 @@ struct ecx_plat_data {
 
 #define SGPIO_SIGNALS			3
 #define ECX_ACTIVITY_BITS		0x300000
-#define ECX_ACTIVITY_SHIFT		2
+#define ECX_ACTIVITY_SHIFT		0
 #define ECX_LOCATE_BITS			0x80000
 #define ECX_LOCATE_SHIFT		1
 #define ECX_FAULT_BITS			0x400000
-#define ECX_FAULT_SHIFT			0
+#define ECX_FAULT_SHIFT			2
 static inline int sgpio_bit_shift(struct ecx_plat_data *pdata, u32 port,
 				u32 shift)
 {
-- 
1.8.1.2

[PATCH v2 2/5] sata highbank: enable 64-bit DMA mask when using LPAE

[Mark Langsdorf]

From: Rob Herring <rob.herring@calxeda.com>

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
---
Changes from v1
	None.

 drivers/ata/sata_highbank.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index e9a4f46..8b40025 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -479,6 +479,9 @@ static int ahci_highbank_probe(struct platform_device *pdev)
 	if (hpriv->cap & HOST_CAP_PMP)
 		pi.flags |= ATA_FLAG_PMP;
 
+	if (hpriv->cap & HOST_CAP_64)
+		dma_set_coherent_mask(dev, DMA_BIT_MASK(64));
+
 	/* CAP.NP sometimes indicate the index of the last enabled
 	 * port, at other times, that of the last possible port, so
 	 * determining the maximum port number requires looking at
-- 
1.8.1.2

[PATCH v2 3/5] devicetree: create a separate binding description for sata_highbank

[Mark Langsdorf]

The Calxeda sata_highbank driver has been adding its descriptions to the
ahci driver. Separate them properly.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
---
Changes from v1
	None.

 .../devicetree/bindings/ata/ahci-platform.txt      | 14 ++--------
 .../devicetree/bindings/ata/sata_highbank.txt      | 32 ++++++++++++++++++++++
 2 files changed, 34 insertions(+), 12 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/ata/sata_highbank.txt

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index 3ec0c5c..14d7b22 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -4,27 +4,17 @@ SATA nodes are defined to describe on-chip Serial ATA controllers.
 Each SATA controller should have its own node.
 
 Required properties:
-- compatible        : compatible list, contains "calxeda,hb-ahci" or "snps,spear-ahci"
+- compatible        : compatible list, contains "snps,spear-ahci"
 - interrupts        : <interrupt mapping for SATA IRQ>
 - reg               : <registers mapping>
 
 Optional properties:
-- calxeda,port-phys: phandle-combophy and lane assignment, which maps each
-			SATA port to a combophy and a lane within that
-			combophy
-- calxeda,sgpio-gpio: phandle-gpio bank, bit offset, and default on or off,
-			which indicates that the driver supports SGPIO
-			indicator lights using the indicated GPIOs
-- calxeda,led-order : a u32 array that map port numbers to offsets within the
-			SGPIO bitstream.
 - dma-coherent      : Present if dma operations are coherent
 
 Example:
         sata@ffe08000 {
-		compatible = "calxeda,hb-ahci";
+		compatible = "snps,spear-ahci";
                 reg = <0xffe08000 0x1000>;
                 interrupts = <115>;
-		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
-					&combophy0 2 &combophy0 3>;
 
         };
diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt
new file mode 100644
index 0000000..aa1b798
--- /dev/null
+++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt
@@ -0,0 +1,32 @@
+* Calxeda AHCI SATA Controller
+
+SATA nodes are defined to describe on-chip Serial ATA controllers.
+The Calxeda SATA controller mostly conforms to the AHCI interface
+with some special extensions to add functionality.
+Each SATA controller should have its own node.
+
+Required properties:
+- compatible        : compatible list, contains "calxeda,hb-ahci"
+- interrupts        : <interrupt mapping for SATA IRQ>
+- reg               : <registers mapping>
+
+Optional properties:
+- dma-coherent      : Present if dma operations are coherent
+- calxeda,port-phys: phandle-combophy and lane assignment, which maps each
+			SATA port to a combophy and a lane within that
+			combophy
+- calxeda,sgpio-gpio: phandle-gpio bank, bit offset, and default on or off,
+			which indicates that the driver supports SGPIO
+			indicator lights using the indicated GPIOs
+- calxeda,led-order : a u32 array that map port numbers to offsets within the
+			SGPIO bitstream.
+
+Example:
+        sata@ffe08000 {
+		compatible = "calxeda,hb-ahci";
+                reg = <0xffe08000 0x1000>;
+                interrupts = <115>;
+		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
+					&combophy0 2 &combophy0 3>;
+
+        };
-- 
1.8.1.2

Re: [PATCH v2 3/5] devicetree: create a separate binding description for sata_highbank

[Sergei Shtylyov]

On 08/02/2013 08:28 PM, Mark Langsdorf wrote:

> The Calxeda sata_highbank driver has been adding its descriptions to the
> ahci driver. Separate them properly.

> Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
> Acked-by: Rob Herring <rob.herring@calxeda.com>
[...]

> diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
> index 3ec0c5c..14d7b22 100644
> --- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
> +++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
> @@ -4,27 +4,17 @@ SATA nodes are defined to describe on-chip Serial ATA controllers.
[...]
>   Example:
>           sata@ffe08000 {
> -		compatible = "calxeda,hb-ahci";
> +		compatible = "snps,spear-ahci";
>                   reg = <0xffe08000 0x1000>;
>                   interrupts = <115>;

    Indented these 2 props with spaces, would be good to fix...

> -		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
> -					&combophy0 2 &combophy0 3>;
>
>           };
> diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt
> new file mode 100644
> index 0000000..aa1b798
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt

    Shouldn't the file be called calxeda,hb-ahci.txt?

> @@ -0,0 +1,32 @@
> +* Calxeda AHCI SATA Controller
> +
> +SATA nodes are defined to describe on-chip Serial ATA controllers.
> +The Calxeda SATA controller mostly conforms to the AHCI interface
> +with some special extensions to add functionality.
> +Each SATA controller should have its own node.
> +
> +Required properties:
> +- compatible        : compatible list, contains "calxeda,hb-ahci"
> +- interrupts        : <interrupt mapping for SATA IRQ>
> +- reg               : <registers mapping>
> +
> +Optional properties:
> +- dma-coherent      : Present if dma operations are coherent
> +- calxeda,port-phys: phandle-combophy and lane assignment, which maps each
> +			SATA port to a combophy and a lane within that
> +			combophy
> +- calxeda,sgpio-gpio: phandle-gpio bank, bit offset, and default on or off,
> +			which indicates that the driver supports SGPIO
> +			indicator lights using the indicated GPIOs
> +- calxeda,led-order : a u32 array that map port numbers to offsets within the
> +			SGPIO bitstream.
> +
> +Example:
> +        sata@ffe08000 {
> +		compatible = "calxeda,hb-ahci";
> +                reg = <0xffe08000 0x1000>;
> +                interrupts = <115>;
> +		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1

    Could you indent props uniformly here, with tabs?

WBR, Sergei

Re: [PATCH v2 3/5] devicetree: create a separate binding description for sata_highbank

[Mark Langsdorf]

On 08/02/2013 03:01 PM, Sergei Shtylyov wrote:
> On 08/02/2013 08:28 PM, Mark Langsdorf wrote:
> 
>> The Calxeda sata_highbank driver has been adding its descriptions to the
>> ahci driver. Separate them properly.
> 
>> Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
>> Acked-by: Rob Herring <rob.herring@calxeda.com>
> [...]
> 
>> diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
>> index 3ec0c5c..14d7b22 100644
>> --- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
>> +++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
>> @@ -4,27 +4,17 @@ SATA nodes are defined to describe on-chip Serial ATA controllers.
> [...]
>>   Example:
>>           sata@ffe08000 {
>> -		compatible = "calxeda,hb-ahci";
>> +		compatible = "snps,spear-ahci";
>>                   reg = <0xffe08000 0x1000>;
>>                   interrupts = <115>;
> 
>     Indented these 2 props with spaces, would be good to fix...

Thanks, I will fix.

>> -		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
>> -					&combophy0 2 &combophy0 3>;
>>
>>           };
>> diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt
>> new file mode 100644
>> index 0000000..aa1b798
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt
>     Shouldn't the file be called calxeda,hb-ahci.txt?

# ls Documentation/devicetree/bindings/ata/
ahci-platform.txt         exynos-sata.txt           pata-arasan.txt
atmel-at91_cf.txt         fsl-sata.txt              sata_highbank.txt
cavium-compact-flash.txt  imx-pata.txt
exynos-sata-phy.txt       marvell.txt

By comparison with the other files in the directory, no. Using _ instead
of - is slightly unorthodox but not unknown within the
devicetree/bindings subdirectories.

>> @@ -0,0 +1,32 @@
>> +* Calxeda AHCI SATA Controller
>> +
>> +SATA nodes are defined to describe on-chip Serial ATA controllers.
>> +The Calxeda SATA controller mostly conforms to the AHCI interface
>> +with some special extensions to add functionality.
>> +Each SATA controller should have its own node.
>> +
>> +Required properties:
>> +- compatible        : compatible list, contains "calxeda,hb-ahci"
>> +- interrupts        : <interrupt mapping for SATA IRQ>
>> +- reg               : <registers mapping>
>> +
>> +Optional properties:
>> +- dma-coherent      : Present if dma operations are coherent
>> +- calxeda,port-phys: phandle-combophy and lane assignment, which maps each
>> +			SATA port to a combophy and a lane within that
>> +			combophy
>> +- calxeda,sgpio-gpio: phandle-gpio bank, bit offset, and default on or off,
>> +			which indicates that the driver supports SGPIO
>> +			indicator lights using the indicated GPIOs
>> +- calxeda,led-order : a u32 array that map port numbers to offsets within the
>> +			SGPIO bitstream.
>> +
>> +Example:
>> +        sata@ffe08000 {
>> +		compatible = "calxeda,hb-ahci";
>> +                reg = <0xffe08000 0x1000>;
>> +                interrupts = <115>;
>> +		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
> 
>     Could you indent props uniformly here, with tabs?

Yes.

Thanks for the review.

--Mark Langsdorf
Calxeda, Inc.

[PATCH v2 4/5] sata, highbank: set tx_atten override bits

[Mark Langsdorf]

Some board designs do not drive the SATA transmit lines within the
specification. The ECME can provide override settings, on a per board
basis, to bring the transmit lines within spec. Read those settings
from the DTB and program them in.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
---
Changes from v1
	Clarified that the array is a u32 array.
	Added an example in the bindings.

 .../devicetree/bindings/ata/sata_highbank.txt      |  5 +-
 drivers/ata/sata_highbank.c                        | 58 +++++++++++++++++-----
 2 files changed, 49 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt
index aa1b798..b6f04a2 100644
--- a/Documentation/devicetree/bindings/ata/sata_highbank.txt
+++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt
@@ -20,6 +20,9 @@ Optional properties:
 			indicator lights using the indicated GPIOs
 - calxeda,led-order : a u32 array that map port numbers to offsets within the
 			SGPIO bitstream.
+- calxeda,tx-atten  : a u32 array that contains TX attenuation override
+			codes, one per port. The upper 3 bytes are always
+			0 and thus ignored.
 
 Example:
         sata@ffe08000 {
@@ -28,5 +31,5 @@ Example:
                 interrupts = <115>;
 		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
 					&combophy0 2 &combophy0 3>;
-
+		calxeda,tx-atten = <0xff 22 0xff 0xff 23>;
         };
diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index 8b40025..a7c8038 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -46,14 +46,19 @@
 #define CR_BUSY				0x0001
 #define CR_START			0x0001
 #define CR_WR_RDN			0x0002
+#define CPHY_TX_INPUT_STS		0x2001
 #define CPHY_RX_INPUT_STS		0x2002
-#define CPHY_SATA_OVERRIDE	 	0x4000
-#define CPHY_OVERRIDE			0x2005
+#define CPHY_SATA_TX_OVERRIDE		0x8000
+#define CPHY_SATA_RX_OVERRIDE	 	0x4000
+#define CPHY_TX_OVERRIDE		0x2004
+#define CPHY_RX_OVERRIDE		0x2005
 #define SPHY_LANE			0x100
 #define SPHY_HALF_RATE			0x0001
 #define CPHY_SATA_DPLL_MODE		0x0700
 #define CPHY_SATA_DPLL_SHIFT		8
 #define CPHY_SATA_DPLL_RESET		(1 << 11)
+#define CPHY_SATA_TX_ATTEN		0x1c00
+#define CPHY_SATA_TX_ATTEN_SHIFT	10
 #define CPHY_PHY_COUNT			6
 #define CPHY_LANE_COUNT			4
 #define CPHY_PORT_COUNT			(CPHY_PHY_COUNT * CPHY_LANE_COUNT)
@@ -66,6 +71,7 @@ struct phy_lane_info {
 	void __iomem *phy_base;
 	u8 lane_mapping;
 	u8 phy_devs;
+	u8 tx_atten;
 };
 static struct phy_lane_info port_data[CPHY_PORT_COUNT];
 
@@ -76,7 +82,6 @@ static DEFINE_SPINLOCK(sgpio_lock);
 #define SGPIO_PINS			3
 #define SGPIO_PORTS			8
 
-/* can be cast as an ahci_host_priv for compatibility with most functions */
 struct ecx_plat_data {
 	u32		n_ports;
 	unsigned	sgpio_gpio[SGPIO_PINS];
@@ -259,8 +264,27 @@ static void highbank_cphy_disable_overrides(u8 sata_port)
 	if (unlikely(port_data[sata_port].phy_base == NULL))
 		return;
 	tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
-	tmp &= ~CPHY_SATA_OVERRIDE;
-	combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
+	tmp &= ~CPHY_SATA_RX_OVERRIDE;
+	combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
+}
+
+static void cphy_override_tx_attenuation(u8 sata_port, u32 val)
+{
+	u8 lane = port_data[sata_port].lane_mapping;
+	u32 tmp;
+
+	if (val & 0x8)
+		return;
+
+	tmp = combo_phy_read(sata_port, CPHY_TX_INPUT_STS + lane * SPHY_LANE);
+	tmp &= ~CPHY_SATA_TX_OVERRIDE;
+	combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
+
+	tmp |= CPHY_SATA_TX_OVERRIDE;
+	combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
+
+	tmp |= (val << CPHY_SATA_TX_ATTEN_SHIFT) & CPHY_SATA_TX_ATTEN;
+	combo_phy_write(sata_port, CPHY_TX_OVERRIDE + lane * SPHY_LANE, tmp);
 }
 
 static void cphy_override_rx_mode(u8 sata_port, u32 val)
@@ -268,21 +292,21 @@ static void cphy_override_rx_mode(u8 sata_port, u32 val)
 	u8 lane = port_data[sata_port].lane_mapping;
 	u32 tmp;
 	tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
-	tmp &= ~CPHY_SATA_OVERRIDE;
-	combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
+	tmp &= ~CPHY_SATA_RX_OVERRIDE;
+	combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 
-	tmp |= CPHY_SATA_OVERRIDE;
-	combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
+	tmp |= CPHY_SATA_RX_OVERRIDE;
+	combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 
 	tmp &= ~CPHY_SATA_DPLL_MODE;
 	tmp |= val << CPHY_SATA_DPLL_SHIFT;
-	combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
+	combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 
 	tmp |= CPHY_SATA_DPLL_RESET;
-	combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
+	combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 
 	tmp &= ~CPHY_SATA_DPLL_RESET;
-	combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
+	combo_phy_write(sata_port, CPHY_RX_OVERRIDE + lane * SPHY_LANE, tmp);
 
 	msleep(15);
 }
@@ -299,16 +323,20 @@ static void highbank_cphy_override_lane(u8 sata_port)
 						lane * SPHY_LANE);
 	} while ((tmp & SPHY_HALF_RATE) && (k++ < 1000));
 	cphy_override_rx_mode(sata_port, 3);
+	cphy_override_tx_attenuation(sata_port, port_data[sata_port].tx_atten);
 }
 
 static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
 {
 	struct device_node *sata_node = dev->of_node;
-	int phy_count = 0, phy, port = 0;
+	int phy_count = 0, phy, port = 0, i;
 	void __iomem *cphy_base[CPHY_PHY_COUNT];
 	struct device_node *phy_nodes[CPHY_PHY_COUNT];
+	u32 tx_atten[CPHY_PORT_COUNT];
+
 	memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT);
 	memset(phy_nodes, 0, sizeof(struct device_node*) * CPHY_PHY_COUNT);
+	memset(tx_atten, 0xff, CPHY_PORT_COUNT);
 
 	do {
 		u32 tmp;
@@ -336,6 +364,10 @@ static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
 		of_node_put(phy_data.np);
 		port += 1;
 	} while (port < CPHY_PORT_COUNT);
+	of_property_read_u32_array(sata_node, "calxeda,tx-atten",
+				tx_atten, port);
+	for (i = 0; i < port; i++)
+		port_data[i].tx_atten = (u8) tx_atten[i];
 	return 0;
 }
 
-- 
1.8.1.2

[PATCH v2 5/5] sata, highbank: send extra clock cycles in SGPIO patterns

[Mark Langsdorf]

Some SGPIO PICs don't follow the standard very well and expect a certain
number of clock cycles or port frames in each SGPIO pattern. Add two
optional parameters in the DTB that can provide the number of extra
clock cycles to be sent before and after SGPIO pattern. Read those
parameters from the DTB and send the extra clock cycles.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
---
Changes from v1
	Added an example to the bindings.
	Forced the pre-clocks and post-clocks values to 0 if there is an
error while reading them or the values aren't in the DTB.

 Documentation/devicetree/bindings/ata/sata_highbank.txt |  6 ++++++
 drivers/ata/sata_highbank.c                             | 13 +++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/ata/sata_highbank.txt b/Documentation/devicetree/bindings/ata/sata_highbank.txt
index b6f04a2..febb5f5 100644
--- a/Documentation/devicetree/bindings/ata/sata_highbank.txt
+++ b/Documentation/devicetree/bindings/ata/sata_highbank.txt
@@ -23,6 +23,10 @@ Optional properties:
 - calxeda,tx-atten  : a u32 array that contains TX attenuation override
 			codes, one per port. The upper 3 bytes are always
 			0 and thus ignored.
+- calxeda,pre-clocks : a u32 that indicates the number of additional clock
+			cycles to transmit before sending an SGPIO pattern
+- calxeda,post-clocks: a u32 that indicates the number of additional clock
+			cycles to transmit after sending an SGPIO pattern
 
 Example:
         sata@ffe08000 {
@@ -32,4 +36,6 @@ Example:
 		calxeda,port-phys = <&combophy5 0 &combophy0 0 &combophy0 1
 					&combophy0 2 &combophy0 3>;
 		calxeda,tx-atten = <0xff 22 0xff 0xff 23>;
+		calxeda,pre-clocks = <10>;
+		calxeda,post-clocks = <0>;
         };
diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index a7c8038..7f5e5d9 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -84,6 +84,9 @@ static DEFINE_SPINLOCK(sgpio_lock);
 
 struct ecx_plat_data {
 	u32		n_ports;
+	/* number of extra clocks that the SGPIO PIC controller expects */
+	u32		pre_clocks;
+	u32		post_clocks;
 	unsigned	sgpio_gpio[SGPIO_PINS];
 	u32		sgpio_pattern;
 	u32		port_to_sgpio[SGPIO_PORTS];
@@ -160,6 +163,9 @@ static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
 	spin_lock_irqsave(&sgpio_lock, flags);
 	ecx_parse_sgpio(pdata, ap->port_no, state);
 	sgpio_out = pdata->sgpio_pattern;
+	for (i = 0; i < pdata->pre_clocks; i++)
+		ecx_led_cycle_clock(pdata);
+
 	gpio_set_value(pdata->sgpio_gpio[SLOAD], 1);
 	ecx_led_cycle_clock(pdata);
 	gpio_set_value(pdata->sgpio_gpio[SLOAD], 0);
@@ -172,6 +178,8 @@ static ssize_t ecx_transmit_led_message(struct ata_port *ap, u32 state,
 		sgpio_out >>= 1;
 		ecx_led_cycle_clock(pdata);
 	}
+	for (i = 0; i < pdata->post_clocks; i++)
+		ecx_led_cycle_clock(pdata);
 
 	/* save off new led state for port/slot */
 	emp->led_state = state;
@@ -206,6 +214,11 @@ static void highbank_set_em_messages(struct device *dev,
 	of_property_read_u32_array(np, "calxeda,led-order",
 						pdata->port_to_sgpio,
 						pdata->n_ports);
+	if (of_property_read_u32(np, "calxeda,pre-clocks", &pdata->pre_clocks))
+		pdata->pre_clocks = 0;
+	if (of_property_read_u32(np, "calxeda,post-clocks",
+				&pdata->post_clocks))
+		pdata->post_clocks = 0;
 
 	/* store em_loc */
 	hpriv->em_loc = 0;
-- 
1.8.1.2