On Wed, Sep 13, 2017 at 5:02 AM, Marek Vasut marek.vasut@gmail.com wrote:
The Linux kernel driver sets the number of event segments and entries to 1 , while the initial import of the xhci code set that values to 3 for reasons unknown. While most controllers are fine with more event segments with more entries, there are standard-conformant controllers (ie. Renesas RCar xHCI) which only support 1 event segment.
Set the number of event segments and event entries back to 1 to allow such controllers to work with U-Boot xHCI stack. Note that the Renesas controller correctly indicates ERST Max = 1 in HCSPARAMS2[7:4] .
Signed-off-by: Marek Vasut marek.vasut+renesas@gmail.com Cc: Bin Meng bmeng.cn@gmail.com
drivers/usb/host/xhci.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
Reviewed-by: Bin Meng bmeng.cn@gmail.com Tested-by: Bin Meng bmeng.cn@gmail.com