Downstream has a flag called qcom,dp-manual-pullup which informs the
downstream driver if it should toggle ULPI_MISC_A_VBUSVLDEXTSEL and
ULPI_MISC_A_VBUSVLDEXT.
Downstream states:
"qcom,dp-manual-pullup: If present, vbus is not routed to USB
controller/phy and controller driver therefore enables pull-up
explicitly before starting controller using usbcmd run/stop bit."
Working with a type-c controller which handles VBUS entirely means there's
a need to replicate similar logic in upstream.
The current PHY code waggles these bits if an extcon associated with VBUS
exists but, that is not the case when using a full-fat type-c controller
i.e. there's no VBUS line routed to a SoC pad to sense.
This patch enables and disables the VBUS pullup bits on PHY power_on and
power_off respectively if the DT has declared the bool
"qcom,enable-vbus-pullup".
Cc: Andy Gross <agross@xxxxxxxxxx>
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
Cc: Vinod Koul <vkoul@xxxxxxxxxx>
Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
---
drivers/phy/qualcomm/phy-qcom-usb-hs.c | 36 ++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/phy/qualcomm/phy-qcom-usb-hs.c b/drivers/phy/qualcomm/phy-qcom-usb-hs.c
index 61054272a7c8..578a4e1fc539 100644
--- a/drivers/phy/qualcomm/phy-qcom-usb-hs.c
+++ b/drivers/phy/qualcomm/phy-qcom-usb-hs.c
@@ -37,6 +37,7 @@ struct qcom_usb_hs_phy {
struct ulpi_seq *init_seq;
struct extcon_dev *vbus_edev;
struct notifier_block vbus_notify;
+ u8 enable_vbus_pullup:1;
};
static int qcom_usb_hs_phy_set_mode(struct phy *phy,
@@ -104,6 +105,23 @@ qcom_usb_hs_phy_vbus_notifier(struct notifier_block *nb, unsigned long event,
return ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXT);
}
+static int qcom_usb_hs_phy_enable_vbus_pullup(struct ulpi *ulpi, bool enable)
+{
+ u8 addr;
+ int ret;
+
+ if (enable)
+ addr = ULPI_SET(ULPI_MISC_A);
+ else
+ addr = ULPI_CLR(ULPI_MISC_A);
+
+ ret = ulpi_write(ulpi, addr, ULPI_MISC_A_VBUSVLDEXTSEL);
+ if (ret)
+ return ret;
+
+ return ulpi_write(ulpi, addr, ULPI_MISC_A_VBUSVLDEXT);
+}
+
static int qcom_usb_hs_phy_power_on(struct phy *phy)
{
struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
@@ -153,6 +171,12 @@ static int qcom_usb_hs_phy_power_on(struct phy *phy)
goto err_ulpi;
}
+ if (uphy->enable_vbus_pullup) {
+ ret = qcom_usb_hs_phy_enable_vbus_pullup(ulpi, true);
+ if (ret)
+ goto err_ulpi;
+ }
+
if (uphy->vbus_edev) {
state = extcon_get_state(uphy->vbus_edev, EXTCON_USB);
/* setup initial state */
@@ -179,10 +203,19 @@ static int qcom_usb_hs_phy_power_on(struct phy *phy)
static int qcom_usb_hs_phy_power_off(struct phy *phy)
{
struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
+ struct ulpi *ulpi = uphy->ulpi;
+ int ret;
if (uphy->vbus_edev)
extcon_unregister_notifier(uphy->vbus_edev, EXTCON_USB,
&uphy->vbus_notify);
+
+ if (uphy->enable_vbus_pullup) {
+ ret = qcom_usb_hs_phy_enable_vbus_pullup(ulpi, false);
+ if (ret)
+ return ret;
+ }
+
regulator_disable(uphy->v3p3);
regulator_disable(uphy->v1p8);
clk_disable_unprepare(uphy->sleep_clk);
@@ -228,6 +261,9 @@ static int qcom_usb_hs_phy_probe(struct ulpi *ulpi)
/* NUL terminate */
uphy->init_seq[size / 2].addr = uphy->init_seq[size / 2].val = 0;
+ if (of_property_read_bool(ulpi->dev.of_node, "qcom,enable-vbus-pullup"))
+ uphy->enable_vbus_pullup = 1;
+
uphy->ref_clk = clk = devm_clk_get(&ulpi->dev, "ref");
if (IS_ERR(clk))
return PTR_ERR(clk);
--
2.25.1
