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 --- v2: - added cast to fix compiler warning --- common/usb_hub.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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 @@ static void usb_hub_power_on(struct usb_hub_device *hub) int i; struct usb_device *dev; unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2; + const char *env;
dev = hub->pusb_dev;
@@ -98,7 +99,14 @@ static void usb_hub_power_on(struct usb_hub_device *hub) /* * 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); }