[ARM] 4864/1: Enable write buffer coalescing on IOP

Some bootloaders are disabling write buffer coalescing. Enable it back
under linux.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index c156ddab9a2d8814af060b0d8c3295767e8a6945..016690b9d5648c3e8b717a235358bc22e996f1d8 100644 (file)
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -114,6 +114,10 @@ clean_addr:        .word   CLEAN_ADDR
  * Nothing too exciting at the moment
  */
 ENTRY(cpu_xscale_proc_init)
+       @ enable write buffer coalescing. Some bootloader disable it
+       mrc     p15, 0, r1, c1, c0, 1
+       bic     r1, r1, #1
+       mcr     p15, 0, r1, c1, c0, 1
        mov     pc, lr
 
 /*