[U-Boot] [PATCH 2/2] Revert "usb: hub: Power-cycle on root-hub ports"

[Marek Vasut]

This reverts commit 020bbcb76b5be0d5406d2ae7c26dbdb013ead812.

This commit causes breakage of the EHCI, where on Tegra it is not
possible to run "usb reset" twice as it results in the board hang.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Vivek Gautam <gautamvivek1987 at gmail.com>
Cc: Stephen Warren <swarren at wwwdotorg.org>
---
 common/usb_hub.c |   34 ----------------------------------
 1 file changed, 34 deletions(-)

diff --git a/common/usb_hub.c b/common/usb_hub.c
index dd2056a..c40ea2f 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -104,45 +104,11 @@ 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);
 	}
-- 
1.7.10.4