usb: hub: remove CONFIG_USB_HUB_MIN_POWER_ON_DELAY

Now that we wait the correct specification-mandated time at the end of
usb_hub_power_on(), I suspect that CONFIG_USB_HUB_MIN_POWER_ON_DELAY has
no purpose.

For cm_t35.h, we already wait longer than the original MIN_POWER_ON_DELAY,
so this change is safe.

For gw_ventana.h, we will wait as long as the original MIN_POWER_ON_DELAY
iff pgood_delay was at least 200ms. I'm not sure if this is the case or
not, hence I've CC'd relevant people to test this change.

Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

README

@@ -1432,9 +1432,6 @@ The following options need to be configured:
 		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
 		txfilltuning field in the EHCI controller on reset.
 
-		CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
-		interval for usb hub power-on delay.(minimum 100msec)
-
 - USB Device:
 		Define the below if you wish to use the USB console.
 		Once firmware is rebuilt from a serial console issue the

common/usb_hub.c

@@ -35,10 +35,6 @@
 #include <asm/4xx_pci.h>
 #endif
 
-#ifndef CONFIG_USB_HUB_MIN_POWER_ON_DELAY
-#define CONFIG_USB_HUB_MIN_POWER_ON_DELAY	1000
-#endif
-
 #define USB_BUFSIZ	512
 
 static struct usb_hub_device hub_dev[USB_MAX_HUB];
@@ -142,7 +138,7 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
 	 * Wait for power to become stable,
 	 * plus spec-defined max time for device to connect
 	 */
-	mdelay(pgood_delay + CONFIG_USB_HUB_MIN_POWER_ON_DELAY);
+	mdelay(pgood_delay + 1000);
 }
 
 void usb_hub_reset(void)

include/configs/cm_t35.h

@@ -104,8 +104,6 @@
 #define CONFIG_USB_DEVICE
 #define CONFIG_USB_TTY
 #define CONFIG_SYS_CONSOLE_IS_IN_ENV
-/* This delay is really for slow-to-power-on USB sticks, not the hub */
-#define CONFIG_USB_HUB_MIN_POWER_ON_DELAY 500
 
 /* commands to include */
 #include <config_cmd_default.h>

include/configs/gw_ventana.h

@@ -192,7 +192,6 @@
 #define CONFIG_USB_ETH_CDC
 #define CONFIG_NETCONSOLE
 #define CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP
-#define CONFIG_USB_HUB_MIN_POWER_ON_DELAY 1200
 
 /* Framebuffer and LCD */
 #define CONFIG_VIDEO