Power on root hubs' ports only when they are not yet powered on.
Its seen with USB 3.0 ports that they are powered on after
a H/W reset, as also reflected in XHCI spec (sec 4.3):
"After a Chip Hardware Reset, HCRST, or commanded to the
PLS = RxDetect state, all Root Hub ports shall be in Disconnected
state, i.e. the port is powered on (PP = 1)"
Signed-off-by: Amar <amarendra...@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vi...@samsung.com>
---
common/usb_hub.c | 22 +++++++++++++++++++---
1 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/common/usb_hub.c b/common/usb_hub.c
index b5eeb62..0677004 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -111,13 +111,29 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
int i;
struct usb_device *dev;
unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
+ ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
+ unsigned short portstatus;
+ int ret;
dev = hub->pusb_dev;
- /* Enable power to the ports */
+
+ /* Enable power to ports whose power is not yet on */
USB_HUB_PRINTF("enabling power on all ports\n");
for (i = 0; i < dev->maxchild; i++) {
- usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
- USB_HUB_PRINTF("port %d returns %lX\n", i + 1, dev->status);
+ ret = usb_get_port_status(dev, i + 1, portsts);
+ if (ret < 0) {
+ USB_HUB_PRINTF("port %d: get_port_status failed\n",
+ i + 1);
+ return;
+ }
+
+ portstatus = le16_to_cpu(portsts->wPortStatus);
+
+ if (!(portstatus & (USB_PORT_STAT_POWER << 1))) {
+ usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
+ USB_HUB_PRINTF("port %d returns %lX\n", i + 1,
+ dev->status);
+ }
}
/* Wait at least 100 msec for power to become stable */
--
1.7.6.5
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