From aa1550588cc60549bf3a97dc6dccb7de4c022aa6 Mon Sep 17 00:00:00 2001
From: Kuo-Jung Su <dantesu@faraday-tech.com>
Date: Wed, 15 May 2013 15:29:22 +0800
Subject: [PATCH] usb: hub: make minimum power-on delay configurable
This patch makes the minimum power-on delay for USB HUB
become configurable. The original design waits at least
100 msec here, but some EHCI controlers(e.g. Faraday EHCI)
are known to require much longer delay interval.
Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>
---
README | 3 +++
common/usb_hub.c | 8 ++++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/README b/README
index 33bda8c929e..ac1ec44d155 100644
--- a/README
+++ b/README
@@ -1261,6 +1261,9 @@ 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
diff --git a/common/usb_hub.c b/common/usb_hub.c
index 0d79ec3ea84..fc3a8c17709 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -53,6 +53,10 @@
#include <asm/4xx_pci.h>
#endif
+#ifndef CONFIG_USB_HUB_MIN_POWER_ON_DELAY
+#define CONFIG_USB_HUB_MIN_POWER_ON_DELAY 100
+#endif
+
#define USB_BUFSIZ 512
static struct usb_hub_device hub_dev[USB_MAX_HUB];
@@ -148,8 +152,8 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
debug("port %d returns %lX\n", i + 1, dev->status);
}
- /* Wait at least 100 msec for power to become stable */
- mdelay(max(pgood_delay, (unsigned)100));
+ /* Wait for power to become stable */
+ mdelay(max(pgood_delay, CONFIG_USB_HUB_MIN_POWER_ON_DELAY));
}
void usb_hub_reset(void)
--
GitLab