From: Timur Tabi <timur@freescale.com>
Date: Fri, 4 Sep 2009 22:05:24 +0000 (-0500)
Subject: fsl: add register read-back to set_law()
X-Git-Tag: v2009.11-rc1~173
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=74c5dfd81f94a2a1f0d6990d17c491d718e8b9ea;p=kernel%2Fu-boot.git

fsl: add register read-back to set_law()

After programming a new LAW, we should read-back the LAWAR register so that
we sync the writes.  Otherwise, code that attempts to use the new LAW-mapped
memory might fail right away.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---

diff --git a/drivers/misc/fsl_law.c b/drivers/misc/fsl_law.c
index 147fe0a..7bdd355 100644
--- a/drivers/misc/fsl_law.c
+++ b/drivers/misc/fsl_law.c
@@ -58,7 +58,8 @@ void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id)
 	out_be32(lawbar, addr >> 12);
 	out_be32(lawar, LAWAR_EN | ((u32)id << 20) | (u32)sz);
 
-	return ;
+	/* Read back so that we sync the writes */
+	in_be32(lawar);
 }
 
 int set_next_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id)