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>

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>
Kuo-Jung Su · Marek Vasut
1 parent 1dde1423ad
Showing 2 changed files with 9 additions and 2 deletions Side-by-side Diff
README
common/usb_hub.c
@@ -1261,6 +1261,9 @@
 		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
@@ -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 @@
 		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)
...	...	@@ -1261,6 +1261,9 @@
1261	1261	CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
1262	1262	txfilltuning field in the EHCI controller on reset.
1263	1263
	1264	+ CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
	1265	+ interval for usb hub power-on delay.(minimum 100msec)
	1266	+
1264	1267	- USB Device:
1265	1268	Define the below if you wish to use the USB console.
1266	1269	Once firmware is rebuilt from a serial console issue the
...	...	@@ -53,6 +53,10 @@
53	53	#include <asm/4xx_pci.h>
54	54	#endif
55	55
	56	+#ifndef CONFIG_USB_HUB_MIN_POWER_ON_DELAY
	57	+#define CONFIG_USB_HUB_MIN_POWER_ON_DELAY 100
	58	+#endif
	59	+
56	60	#define USB_BUFSIZ 512
57	61
58	62	static struct usb_hub_device hub_dev[USB_MAX_HUB];
...	...	@@ -148,8 +152,8 @@
148	152	debug("port %d returns %lX\n", i + 1, dev->status);
149	153	}
150	154
151		- /* Wait at least 100 msec for power to become stable */
152		- mdelay(max(pgood_delay, (unsigned)100));
	155	+ /* Wait for power to become stable */
	156	+ mdelay(max(pgood_delay, CONFIG_USB_HUB_MIN_POWER_ON_DELAY));
153	157	}
154	158
155	159	void usb_hub_reset(void)