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MLK-19258-7 usb: chipidea: imx: add two picophy parameters tuning implementation 

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>
5.4-rM2-2.2.x-imx-squashed
Peter Chen 2019-09-30 13:56:26 +08:00 committed by Dong Aisheng
parent 8f70f8f6b5
commit ecac0beb56
3 changed files with 28 additions and 0 deletions
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5
drivers/usb/chipidea/ci_hdrc_imx.c
View File

@ -166,6 +166,11 @@ 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, "picophy,pre-emp-curr-control",
&data->emp_curr_control);
of_property_read_u32(np, "picophy,dc-vol-level-adjust",
&data->dc_vol_level_adjust);
return data;
}

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

@ -25,6 +25,8 @@ struct imx_usbmisc_data {
enum usb_dr_mode available_role;
unsigned int ext_id:1; /* ID from exteranl event */
unsigned int ext_vbus:1; /* Vbus from exteranl event */
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

@ -103,6 +103,12 @@
#define MX7D_USB_VBUS_WAKEUP_SOURCE_SESS_END MX7D_USB_VBUS_WAKEUP_SOURCE(3)
#define MX7D_USBNC_AUTO_RESUME BIT(2)
#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)
@ -633,6 +639,21 @@ 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);