From: Arnaud Patard <arnaud.patard@rtp-net.org>
Date: Thu, 13 Mar 2008 08:53:21 +0000 (+0100)
Subject: [ARM] 4864/1: Enable write buffer coalescing on IOP
X-Git-Tag: upstream/snapshot3+hdmi~26613^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=391c569daa6e4e999592966e29c146dfc4de9a9c;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

[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 c156dda..016690b 100644
--- 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
 
 /*