Occasionally it was observed that on Intel MinnowMax board, with a
USB 2.0 device connected to the bottom port, when doing 'usb start'
on the xHCI controller:
scanning bus 0 for devices... cannot reset port 3!?
But neither of the two USB ports is routed to xHCI root port 3.
Adding some debug information shows that xHCI port 3 PORTSC register
mysteriously reports both CCS = 1 and CSC = 1.
This is not seen every time. After increasing the timeout to wait
for power to become stable, the issue is gone. So this indicates
current default USB power-on delay (20ms) might be at a critical
region where power is stable/unstable. U-Boot provides a mechanism
to have a environment variable to override the default one. Add
one for MinnowMax.
Signed-off-by: Bin Meng <bmeng...@gmail.com>
Reviewed-by: Simon Glass <s...@chromium.org>
Reviewed-by: Stefan Roese <s...@denx.de>
Tested-by: Stefan Roese <s...@denx.de>
---
Changes in v2: None
include/configs/minnowmax.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/configs/minnowmax.h b/include/configs/minnowmax.h
index ae95485..6ea607d 100644
--- a/include/configs/minnowmax.h
+++ b/include/configs/minnowmax.h
@@ -20,7 +20,8 @@
#define CONFIG_STD_DEVICES_SETTINGS "stdin=usbkbd,serial\0" \
"stdout=vidconsole,serial\0" \
- "stderr=vidconsole,serial\0"
+ "stderr=vidconsole,serial\0" \
+ "usb_pgood_delay=40\0"
#define CONFIG_SCSI_DEV_LIST \
{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VALLEYVIEW_SATA}, \
--
2.9.2
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