From aa1550588cc60549bf3a97dc6dccb7de4c022aa6 Mon Sep 17 00:00:00 2001 From: Kuo-Jung Su 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 CC: Marek Vasut --- README | 3 +++ common/usb_hub.c | 8 ++++++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/README b/README index 33bda8c929..ac1ec44d15 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 0d79ec3ea8..fc3a8c1770 100644 --- a/common/usb_hub.c +++ b/common/usb_hub.c @@ -53,6 +53,10 @@ #include #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) -- 2.30.2