[PATCH 1/6] usb: chipidea: Add support for VBUS control with PHY

Manish Narani
2021-08-24T17:21:24Z

Some platforms make use of VBUS control over PHY which
means controller driver has to access PHY registers to
turn on/off VBUS line.This patch adds support for
such platforms in chipidea.

Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
drivers/usb/chipidea/ci_hdrc_usb2.c | 1 +
drivers/usb/chipidea/host.c | 9 +++++++++
drivers/usb/chipidea/otg_fsm.c | 7 +++++++
include/linux/usb/chipidea.h | 1 +
4 files changed, 18 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_usb2.c b/drivers/usb/chipidea/ci_hdrc_usb2.c
index 89e1d82..dc86b12 100644
--- a/drivers/usb/chipidea/ci_hdrc_usb2.c
+++ b/drivers/usb/chipidea/ci_hdrc_usb2.c
@@ -30,6 +30,7 @@ static const struct ci_hdrc_platform_data ci_default_pdata = {

static const struct ci_hdrc_platform_data ci_zynq_pdata = {
.capoffset = DEF_CAPOFFSET,
+ .flags = CI_HDRC_PHY_VBUS_CONTROL,
};

static const struct ci_hdrc_platform_data ci_zevio_pdata = {
diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index e86d13c..578968d 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -63,6 +63,14 @@ static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
priv->enabled = enable;
}

+ if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL &&
+ ci->usb_phy && ci->usb_phy->set_vbus) {
+ if (enable)
+ ci->usb_phy->set_vbus(ci->usb_phy, 1);
+ else
+ ci->usb_phy->set_vbus(ci->usb_phy, 0);
+ }
+
if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
/*
* Marvell 28nm HSIC PHY requires forcing the port to HS mode.
@@ -71,6 +79,7 @@ static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
hw_port_test_set(ci, 5);
hw_port_test_set(ci, 0);
}
+
return 0;
};

diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index 6ed4b00..2f7f94d 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -471,6 +471,10 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
return;
}
}
+
+ if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL)
+ ci->usb_phy->set_vbus(ci->usb_phy, 1);
+
/* Disable data pulse irq */
hw_write_otgsc(ci, OTGSC_DPIE, 0);

@@ -480,6 +484,9 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
if (ci->platdata->reg_vbus)
regulator_disable(ci->platdata->reg_vbus);

+ if (ci->platdata->flags & CI_HDRC_PHY_VBUS_CONTROL)
+ ci->usb_phy->set_vbus(ci->usb_phy, 0);
+
fsm->a_bus_drop = 1;
fsm->a_bus_req = 0;
}
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index edf3342..ee38835 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -62,6 +62,7 @@ struct ci_hdrc_platform_data {
#define CI_HDRC_REQUIRES_ALIGNED_DMA BIT(13)
#define CI_HDRC_IMX_IS_HSIC BIT(14)
#define CI_HDRC_PMQOS BIT(15)
+#define CI_HDRC_PHY_VBUS_CONTROL BIT(16)
enum usb_dr_mode dr_mode;
#define CI_HDRC_CONTROLLER_RESET_EVENT 0
#define CI_HDRC_CONTROLLER_STOPPED_EVENT 1
--
2.1.1