[U-Boot] [PATCH v5 1/4] usb: hub: make minimum power-on delay configurable

[Kuo-Jung Su]

From: Kuo-Jung Su <dantesu at faraday-tech.com>

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.

NOTE:
The minimal delay is still 100 msec, a small value defined
in CONFIG_USB_HUB_MIN_POWER_ON_DELAY would be automatically
justified in common/usb_hub.c.

Signed-off-by: Kuo-Jung Su <dantesu at faraday-tech.com>
CC: Marek Vasut <marex at denx.de>
---
Changes for v5:
   - Split up from Faraday EHCI patch
   - Replace the Faraday EHCI ifdef for the long delay
     in usb_hub_configure() with the new configuration option:
     USB_HUB_MIN_POWER_ON_DELAY, which is used in usb_hub_power_on()
     to control the minimum usb hub power-on delay.

Changes for v2 - v4:
   - See 'usb: ehci: add Faraday USB 2.0 EHCI support'

 README           |    3 +++
 common/usb_hub.c |    8 +++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/README b/README
index 0d37d56..c70a59b 100644
--- a/README
+++ b/README
@@ -1244,6 +1244,9 @@ 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 b5eeb62..0db3530 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -61,6 +61,12 @@
 #define USB_HUB_DEBUG	0
 #endif

+#if CONFIG_USB_HUB_MIN_POWER_ON_DELAY > 100
+# define USB_HUB_MIN_POWER_ON_DELAY	CONFIG_USB_HUB_MIN_POWER_ON_DELAY
+#else
+# define USB_HUB_MIN_POWER_ON_DELAY	100
+#endif
+
 #define USB_PRINTF(fmt, args...)	debug_cond(USB_DEBUG, fmt, ##args)
 #define USB_HUB_PRINTF(fmt, args...)	debug_cond(USB_HUB_DEBUG, fmt, ##args)

@@ -121,7 +127,7 @@ static void usb_hub_power_on(struct usb_hub_device *hub)
 	}

 	/* Wait at least 100 msec for power to become stable */
-	mdelay(max(pgood_delay, (unsigned)100));
+	mdelay(max(pgood_delay, USB_HUB_MIN_POWER_ON_DELAY));
 }

 void usb_hub_reset(void)
--
1.7.9.5