Some USB devices break the spec and require longer warm-up times. Allow
the usb_pgood_delay env variable to override the calculated time.
I have encountered this specficically with several different sized/branded USB
sticks with VID:PID 058f:6387 (Alcor Micro Corp. Transcend JetFlash) where I
need to set usb_pgood_delay to 2000ms to make them detectable.
Signed-off-by: Tim Harvey <thar...@gateworks.com>
---
common/usb_hub.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/common/usb_hub.c b/common/usb_hub.c
index 66b4a72..a0ef058 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 +99,13 @@ 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, simple_strtol(env, NULL, 0));
+ debug("pgood_delay=%dms\n", pgood_delay);
mdelay(pgood_delay + 1000);
}
--
1.9.1
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