common: usb-hub: Reset hub port before scanning

Currently when a hub is turned on, all the ports are powered on.
This works well for hubs which have individual power control.

For the hubs without individual power control this has no effect.
Mostly in these scenarios the hub port is powered before the USB
controller is enabled, this can lead to some devices in unexpected
state.

With this patch, we explicitly reset the port while powering up hub
This resets the port for hubs without port power control and has
no effect on hubs with port power control as the port is still off.

Before this patch AMicro AM8180 based NVME to USB adapter won't be
detected as a USB3.0 Mass Storage device but with this it works as
expected.

Tested working after this patch:
1. AMicro AM8180 based NVME to USB Adapter
2. Kingston DataTraveler 3.0
3. GenesysLogic USB3.0 Hub

The drives were tested while connected directly and via the hub.

Signed-off-by: Shantur Rathore <i@shantur.com>
Reviewed-by: Marek Vasut <marex@denx.de>

diff --git a/common/usb_hub.c b/common/usb_hub.c
index 70279f301d5ab2b9d1421cbf338a56df45cf2e0b..3fb7e14d10620aaf0d48f769c0760d26fee81f63 100644 (file)
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -174,8 +174,10 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
 
        debug("enabling power on all ports\n");
        for (i = 0; i < dev->maxchild; i++) {
+               usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_RESET);
+               debug("Reset : port %d returns %lX\n", i + 1, dev->status);
                usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
-               debug("port %d returns %lX\n", i + 1, dev->status);
+               debug("PowerOn : port %d returns %lX\n", i + 1, dev->status);
        }
 
 #ifdef CONFIG_SANDBOX