[PATCH 1/2] ARM: l2x0: make it possible to disable outer sync from DT

Linus Walleij linus.walleij at linaro.org
Mon Dec 14 05:23:30 PST 2015

On Thu, Dec 10, 2015 at 3:20 PM, Arnd Bergmann <arnd at arndb.de> wrote:
> On Thursday 10 December 2015 15:14:15 Linus Walleij wrote:
>> Some RealView platforms have broken outer_sync, see:
>> http://marc.info/?l=linux-kernel&m=144846940516899&w=2
>> We got rid of the custom barriers from the machine by disabling
>> outer sync, but that was just for the boardfile case. We have
>> to be able to do the same in the device tree case.
>> Since __l2c_init() is cloning and copying the L2C vtable,
>> we pass an argument to this function to optionally numb
>> the outer sync operation if desired, before initializing
>> the cache.
>> After this we can set up the cache correctly on the RealView
>> PB11MPCore, and it boots rock solid with the cache enabled.
>> Before this, spurious crashes would occur if we try to set
>> up the cache properly.
>> Cc: Russell King <linux at arm.linux.org.uk>
>> Cc: Arnd Bergmann <arnd at arndb.de>
>> Cc: devicetree at vger.kernel.org
>> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> This has the same effect as my "ARM: realview: remove private barrier
> implementation" patch and replaces part of that, correct?

Yes, but applied to a DT-only bootpath with a minimum of board
file code, kept in l2x0.c just this bool in the DT node.

Linus Walleij

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