tree ebb8f524f2e56310c7c3adacfa78b5ec1a16d5d5
parent 513c4eb162aecea92e0b05a7c5e206474526eda2
author Linus Walleij <linus.walleij@linaro.org> 1313150082 +0200
committer Greg Kroah-Hartman <gregkh@suse.de> 1321032977 -0800

ARM: mach-ux500: unlock I&D l2x0 caches before init

commit 1bf6d2c1bb23533af6930581cc39b74685bc29de upstream.

Apparently U8500 U-Boot versions may leave the l2x0 locked down
before executing the kernel. Make sure we unlock it before we
initialize the l2x0. This fixes a performance problem reported
by Jan Rinze.

The l2x0 core has been modified to unlock the l2x0 by default,
but it will not touch the locking registers if the l2x0 was
already enabled, as on the ux500, so we need this quirk to
make sure it is properly turned off.

Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Rabin Vincent <rabin.vincent@stericsson.com>
Cc: Adrian Bunk <adrian.bunk@movial.com>
Reported-by: Jan Rinze <janrinze@gmail.com>
Tested-by: Robert Marklund <robert.marklund@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>