XHCI ports are powered on after a H/W reset, however
EHCI ports are not. So disabling and re-enabling power
on all ports invariably.
Signed-off-by: Amar <amarendra...@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vi...@samsung.com>
---
Changes from v2:
- Replaced USB_HUB_PRINTFs to debug()
common/usb_hub.c | 34 ++++++++++++++++++++++++++++++++++
1 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/common/usb_hub.c b/common/usb_hub.c
index f2a0285..e4f4e3c 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -100,11 +100,45 @@ 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 */
debug("enabling power on all ports\n");
for (i = 0; i < dev->maxchild; i++) {
+ /*
+ * Power-cycle the ports here: aka,
+ * turning them off and turning on again.
+ */
+ usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
+ debug("port %d returns %lX\n", i + 1, dev->status);
+
+ /* Wait at least 2*bPwrOn2PwrGood for PP to change */
+ mdelay(pgood_delay);
+
+ ret = usb_get_port_status(dev, i + 1, portsts);
+ if (ret < 0) {
+ debug("port %d: get_port_status failed\n", i + 1);
+ return;
+ }
+
+ /*
+ * Check to confirm the state of Port Power:
+ * xHCI says "After modifying PP, s/w shall read
+ * PP and confirm that it has reached the desired state
+ * before modifying it again, undefined behavior may occur
+ * if this procedure is not followed".
+ * EHCI doesn't say anything like this, but no harm in keeping
+ * this.
+ */
+ portstatus = le16_to_cpu(portsts->wPortStatus);
+ if (portstatus & (USB_PORT_STAT_POWER << 1)) {
+ debug("port %d: Port power change failed\n", i + 1);
+ return;
+ }
+
usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
debug("port %d returns %lX\n", i + 1, dev->status);
}
--
1.7.6.5
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