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usb: chipidea: imx: add one fsl picophy parameter tuning implementation

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In some cases, the user may need to tune the rise/fall time of the
high-speed transmitter waveform for USB Certification. This will add
a parameter for this purpose. The value will be fetched from dtb and
finally written to the register.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20230627112126.1882666-3-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2023-06-27 19:21:26 +08:00 committed by Greg Kroah-Hartman
parent 8d2c452c9e
commit 3bd442e4d2
3 changed files with 13 additions and 0 deletions
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3
drivers/usb/chipidea/ci_hdrc_imx.c
View File

@ -182,6 +182,9 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
if (of_property_read_u32(np, "samsung,picophy-dc-vol-level-adjust",
&data->dc_vol_level_adjust))
data->dc_vol_level_adjust = -1;
if (of_property_read_u32(np, "fsl,picophy-rise-fall-time-adjust",
&data->rise_fall_time_adjust))
data->rise_fall_time_adjust = -1;
return data;
}

1
drivers/usb/chipidea/ci_hdrc_imx.h
View File

@ -28,6 +28,7 @@ struct imx_usbmisc_data {
enum usb_dr_mode available_role; /* runtime usb dr mode */
int emp_curr_control;
int dc_vol_level_adjust;
int rise_fall_time_adjust;
};
int imx_usbmisc_init(struct imx_usbmisc_data *data);

9
drivers/usb/chipidea/usbmisc_imx.c
View File

@ -131,6 +131,8 @@
#define MX7D_USB_OTG_PHY_CFG1 0x30
#define TXPREEMPAMPTUNE0_BIT 28
#define TXPREEMPAMPTUNE0_MASK (3 << 28)
#define TXRISETUNE0_BIT 24
#define TXRISETUNE0_MASK (3 << 24)
#define TXVREFTUNE0_BIT 20
#define TXVREFTUNE0_MASK (0xf << 20)
@ -674,6 +676,13 @@ static int usbmisc_imx7d_init(struct imx_usbmisc_data *data)
reg |= (data->dc_vol_level_adjust << TXVREFTUNE0_BIT);
}
if (data->rise_fall_time_adjust >= 0 &&
data->rise_fall_time_adjust <=
(TXRISETUNE0_MASK >> TXRISETUNE0_BIT)) {
reg &= ~TXRISETUNE0_MASK;
reg |= (data->rise_fall_time_adjust << TXRISETUNE0_BIT);
}
writel(reg, usbmisc->base + MX7D_USB_OTG_PHY_CFG1);
}