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

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>

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index c251a4f..772bbda 100644 (file)
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -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;
 }

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h
index 7135b9a..88b8da7 100644 (file)
--- a/drivers/usb/chipidea/ci_hdrc_imx.h
+++ b/drivers/usb/chipidea/ci_hdrc_imx.h
@@ -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);

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index c4165f0..173c78a 100644 (file)
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -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);
        }