On Thu, Mar 1, 2018 at 1:15 AM, Ruslan Bilovol <[email protected]> wrote: > Remove busy looping during watchdog reset. > Each polling of W_PEND_WTGR bit ("finish posted > write") after watchdog reset takes 120-140us > on BeagleBone Black board. Current U-Boot code > has watchdog resets in random places and often > there is situation when watchdog is reset > few times in a row in nested functions. > This adds extra delays and slows the whole system. > > Instead of polling W_PEND_WTGR bit, we skip > watchdog reset if the bit is set. Anyway, watchdog > is in the middle of reset *right now*, so we can > just return. > > This noticeably increases performance of the > system. Below are some measurements on BBB: > - DFU upload over USB 15% faster > - fastboot image upload 3x times faster > - USB ep0 transfers with 4k packets 20% faster > > Signed-off-by: Ruslan Bilovol <[email protected]>
Tested-by: Alex Kiernan <[email protected]> -- Alex Kiernan _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
