usb: phy: ab8500-usb: set phy tuning values

Set phy tuning values proposed by the hardware teams for AB8500 and
AB8505 to improve USB eye diagram performances.

Signed-off-by: Sakethram Bommisetti <sakethram.bommisetti@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/drivers/usb/phy/phy-ab8500-usb.c b/drivers/usb/phy/phy-ab8500-usb.c
index ab6dd072ae25..5b92a59804eb 100644
--- a/drivers/usb/phy/phy-ab8500-usb.c
+++ b/drivers/usb/phy/phy-ab8500-usb.c
@@ -33,11 +33,22 @@
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/usb/musb-ux500.h>
 
+/* Bank AB8500_SYS_CTRL2_BLOCK */
 #define AB8500_MAIN_WD_CTRL_REG 0x01
+
+/* Bank AB8500_USB */
 #define AB8500_USB_LINE_STAT_REG 0x80
 #define AB8505_USB_LINE_STAT_REG 0x94
 #define AB8500_USB_PHY_CTRL_REG 0x8A
 
+/* Bank AB8500_DEVELOPMENT */
+#define AB8500_BANK12_ACCESS 0x00
+
+/* Bank AB8500_DEBUG */
+#define AB8500_USB_PHY_TUNE1 0x05
+#define AB8500_USB_PHY_TUNE2 0x06
+#define AB8500_USB_PHY_TUNE3 0x07
+
 #define AB8500_BIT_OTG_STAT_ID (1 << 0)
 #define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
 #define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
@@ -671,6 +682,82 @@ static int ab8500_usb_probe(struct platform_device *pdev)
                 return err;
         }
 
+        /* Phy tuning values for AB8500 */
+        if (!is_ab8500_2p0_or_earlier(ab->ab8500)) {
+                /* Enable the PBT/Bank 0x12 access */
+                err = abx500_set_register_interruptible(ab->dev,
+                                AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x01);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
+                                        err);
+
+                err = abx500_set_register_interruptible(ab->dev,
+                                AB8500_DEBUG, AB8500_USB_PHY_TUNE1, 0xC8);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
+                                        err);
+
+                err = abx500_set_register_interruptible(ab->dev,
+                                AB8500_DEBUG, AB8500_USB_PHY_TUNE2, 0x00);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
+                                        err);
+
+                err = abx500_set_register_interruptible(ab->dev,
+                                AB8500_DEBUG, AB8500_USB_PHY_TUNE3, 0x78);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
+                                        err);
+
+                /* Switch to normal mode/disable Bank 0x12 access */
+                err = abx500_set_register_interruptible(ab->dev,
+                                AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS, 0x00);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
+                                        err);
+        }
+
+        /* Phy tuning values for AB8505 */
+        if (is_ab8505(ab->ab8500)) {
+                /* Enable the PBT/Bank 0x12 access */
+                err = abx500_mask_and_set_register_interruptible(ab->dev,
+                                AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
+                                0x01, 0x01);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to enable bank12 access err=%d\n",
+                                        err);
+
+                err = abx500_mask_and_set_register_interruptible(ab->dev,
+                                AB8500_DEBUG, AB8500_USB_PHY_TUNE1,
+                                0xC8, 0xC8);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to set PHY_TUNE1 register err=%d\n",
+                                        err);
+
+                err = abx500_mask_and_set_register_interruptible(ab->dev,
+                                AB8500_DEBUG, AB8500_USB_PHY_TUNE2,
+                                0x60, 0x60);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to set PHY_TUNE2 register err=%d\n",
+                                        err);
+
+                err = abx500_mask_and_set_register_interruptible(ab->dev,
+                                AB8500_DEBUG, AB8500_USB_PHY_TUNE3,
+                                0xFC, 0x80);
+
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to set PHY_TUNE3 regester err=%d\n",
+                                        err);
+
+                /* Switch to normal mode/disable Bank 0x12 access */
+                err = abx500_mask_and_set_register_interruptible(ab->dev,
+                                AB8500_DEVELOPMENT, AB8500_BANK12_ACCESS,
+                                0x00, 0x00);
+                if (err < 0)
+                        dev_err(ab->dev, "Failed to switch bank12 access err=%d\n",
+                                        err);
+        }
+
         /* Needed to enable ID detection. */
         ab8500_usb_wd_workaround(ab);