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 (file)
--- 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);
 }