Hi,
Im using AM3352 processor.
The kernel is from mainline, linux-4.1.15 LTS
I want to detect whether the USB0 is connected to PC or 5V mobile charger adapter.
The following was observed in both cases (USB0 connected to PC or adapter)
1.Read at address 0x44E10620 (USB_CTRL0): 0x3C18640C
2.Read at address 0x44E10624 (USB_STS0 ): 0x00000000
3.Pin USB_CE is low
After changing function am335x_phy_power in drivers/usb/phy/phy-am335x-control.c ,
---
drivers/usb/phy/phy-am335x-control.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/phy/phy-am335x-control.c b/drivers/usb/phy/phy-am335x-control.c
index 7b3035f..c572460 100644
--- a/drivers/usb/phy/phy-am335x-control.c
+++ b/drivers/usb/phy/phy-am335x-control.c
@@ -20,6 +20,9 @@ struct am335x_control_usb {
#define USBPHY_CM_PWRDN (1 << 0)
#define USBPHY_OTG_PWRDN (1 << 1)
+#define USBPHY_CHGDET_DIS (1 << 2)
+#define USBPHY_CHGDET_RSTRT (1 << 3)
+#define USBPHY_CDET_EXTCTL (1 << 10)
#define USBPHY_OTGVDET_EN (1 << 19)
#define USBPHY_OTGSESSEND_EN (1 << 20)
@@ -80,10 +83,10 @@ static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id, bool on)
val = readl(usb_ctrl->phy_reg + reg);
if (on) {
- val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
- val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
+ val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN | USBPHY_CHGDET_DIS | USBPHY_CHGDET_RSTRT | USBPHY_CDET_EXTCTL);
+ val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN ;
} else {
- val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
+ val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN | USBPHY_CHGDET_DIS | USBPHY_CHGDET_RSTRT | USBPHY_CDET_EXTCTL;
}
writel(val, usb_ctrl->phy_reg + reg);
--
1.9.1
following result is obtained.
When connected to Adapter
1.Read at address 0x44E10620 (USB_CTRL0): 0x3C186000
2.Read at address 0x44E10624 (USB_STS0 ): 0x000000A3
3.Pin USB_CE is high.
When connected to PC
1.Read at address 0x44E10620 (USB_CTRL0): 0x3C186000
2.Read at address 0x44E10624 (USB_STS0 ): 0x000000C0
3.Pin USB_CE is low.
The adapter is detected as HOST charger not dedicated charger.Is this the correct result?
Is this the right way of detecting whether the USB0 is connected to PC or adapter?
