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usb: chipidea: imx: add two samsung picophy parameters tuning implementation

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These two parameters are used to improve USB signal for board level,
in this commit, we read it from the dtb, and write to related register
during the initialization.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Peter Chen 2019-09-30 13:56:26 +08:00
parent 8977c947b3
commit 58a3cefb38
No known key found for this signature in database
GPG key ID: 4859298150D671BB
3 changed files with 28 additions and 0 deletions
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5
drivers/usb/chipidea/ci_hdrc_imx.c
View file

@ -165,6 +165,11 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
if (of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI)
data->ulpi = 1;
of_property_read_u32(np, "samsung,picophy-pre-emp-curr-control",
&data->emp_curr_control);
of_property_read_u32(np, "samsung,picophy-dc-vol-level-adjust",
&data->dc_vol_level_adjust);
return data;
}

2
drivers/usb/chipidea/ci_hdrc_imx.h
View file

@ -26,6 +26,8 @@ struct imx_usbmisc_data {
unsigned int ext_vbus:1; /* Vbus from exteranl event */
struct usb_phy *usb_phy;
enum usb_dr_mode available_role; /* runtime usb dr mode */
int emp_curr_control;
int dc_vol_level_adjust;
};
int imx_usbmisc_init(struct imx_usbmisc_data *data);

21
drivers/usb/chipidea/usbmisc_imx.c
View file

@ -128,6 +128,12 @@
#define MX7D_USB_OTG_PHY_STATUS_VBUS_VLD BIT(3)
#define MX7D_USB_OTG_PHY_STATUS_CHRGDET BIT(29)
#define MX7D_USB_OTG_PHY_CFG1 0x30
#define TXPREEMPAMPTUNE0_BIT 28
#define TXPREEMPAMPTUNE0_MASK (3 << 28)
#define TXVREFTUNE0_BIT 20
#define TXVREFTUNE0_MASK (0xf << 20)
#define MX6_USB_OTG_WAKEUP_BITS (MX6_BM_WAKEUP_ENABLE | MX6_BM_VBUS_WAKEUP | \
MX6_BM_ID_WAKEUP)
@ -649,6 +655,21 @@ static int usbmisc_imx7d_init(struct imx_usbmisc_data *data)
writel(reg | MX7D_USB_VBUS_WAKEUP_SOURCE_BVALID
| MX7D_USBNC_AUTO_RESUME,
usbmisc->base + MX7D_USBNC_USB_CTRL2);
/* PHY tuning for signal quality */
reg = readl(usbmisc->base + MX7D_USB_OTG_PHY_CFG1);
if (data->emp_curr_control && data->emp_curr_control <=
(TXPREEMPAMPTUNE0_MASK >> TXPREEMPAMPTUNE0_BIT)) {
reg &= ~TXPREEMPAMPTUNE0_MASK;
reg |= (data->emp_curr_control << TXPREEMPAMPTUNE0_BIT);
}
if (data->dc_vol_level_adjust && data->dc_vol_level_adjust <=
(TXVREFTUNE0_MASK >> TXVREFTUNE0_BIT)) {
reg &= ~TXVREFTUNE0_MASK;
reg |= (data->dc_vol_level_adjust << TXVREFTUNE0_BIT);
}
writel(reg, usbmisc->base + MX7D_USB_OTG_PHY_CFG1);
}
spin_unlock_irqrestore(&usbmisc->lock, flags);