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

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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>
This commit is contained in:
Sakethram Bommisetti 2013-04-03 10:45:04 +02:00 committed by Felipe Balbi
parent 81ef672430
commit 7124631aa8
1 changed files with 87 additions and 0 deletions
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87
drivers/usb/phy/phy-ab8500-usb.c
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@ -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);