usb: chipidea: imx: improve logic if samsung,picophy-* parameter is 0

commit 36668515d56bf73f06765c71e08c8f7465f1e5c4 upstream.

In current driver, the value of tuning parameter will not take effect
if samsung,picophy-* is assigned as 0. Because 0 is also a valid value
acccording to the description of USB_PHY_CFG1 register, this will improve
the logic to let it work.

Fixes: 58a3cefb3840 ("usb: chipidea: imx: add two samsung picophy parameters tuning implementation")
cc: <stable@vger.kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20230627112126.1882666-1-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 f7577f2bd2c5dfe0f3ebd468c5afba08552a64fb..916eae08770db61eb71df4c9a02417b431e87c58 100644 (file)
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -175,10 +175,12 @@ 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);
+       if (of_property_read_u32(np, "samsung,picophy-pre-emp-curr-control",
+                       &data->emp_curr_control))
+               data->emp_curr_control = -1;
+       if (of_property_read_u32(np, "samsung,picophy-dc-vol-level-adjust",
+                       &data->dc_vol_level_adjust))
+               data->dc_vol_level_adjust = -1;
 
        return data;
 }

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 681c2ddc83fa5f1a50a60f28fa6111fb14969149..520fc5b026bdaf4d795fa3943e96bd0752c5f996 100644 (file)
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -660,13 +660,15 @@ static int usbmisc_imx7d_init(struct imx_usbmisc_data *data)
                        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 <=
+               if (data->emp_curr_control >= 0 &&
+                       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 <=
+               if (data->dc_vol_level_adjust >= 0 &&
+                       data->dc_vol_level_adjust <=
                        (TXVREFTUNE0_MASK >> TXVREFTUNE0_BIT)) {
                        reg &= ~TXVREFTUNE0_MASK;
                        reg |= (data->dc_vol_level_adjust << TXVREFTUNE0_BIT);