Dear Vipin Kumar,
The current logic reads the port status just once after usb_hub_power_on and expects the portstatus and portchange to report the connection status immediately and correctly.
Few pen drives are not able to report both of them immediately ie. those pens report the connection change but not the connected state after the first read. This opportunity once lost is gone for ever because the u-boot, unlike linux or any other OS, works in polling mode.
This patch modifies the logic to read the port status continuously until the portstatus and portchange both report a connection change as well as a connected state or no connection change and no connection. This logic is placed in a timeout of 10 sec. At the end of it, the pen drive would have either reported a ONE or a ZERO in bit 1 of portstatus as well as portchange.
It enhances the set of pen drives which can eventually be detected by u-boot
Note: This 10 second timeout is based purely on several experiments done with the broken pen drives
Signed-off-by: Vipin Kumar vipin.kumar@st.com Acked-by: Igor Grinberg grinberg@compulab.co.il
Applied, tested. Thanks
Best regards, Marek Vasut