usb: hub: allow pgood_delay to be specified via env
Some USB devices break the spec and require longer warm-up times. Allow
the usb_pgood_delay env variable to override the calculated time.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/common/usb_hub.c b/common/usb_hub.c
index 66b4a72..f54a404 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -86,6 +86,7 @@
int i;
struct usb_device *dev;
unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
+ const char *env;
dev = hub->pusb_dev;
@@ -98,7 +99,14 @@
/*
* Wait for power to become stable,
* plus spec-defined max time for device to connect
+ * but allow this time to be increased via env variable as some
+ * devices break the spec and require longer warm-up times
*/
+ env = getenv("usb_pgood_delay");
+ if (env)
+ pgood_delay = max(pgood_delay,
+ (unsigned)simple_strtol(env, NULL, 0));
+ debug("pgood_delay=%dms\n", pgood_delay);
mdelay(pgood_delay + 1000);
}