From 74c5dfd81f94a2a1f0d6990d17c491d718e8b9ea Mon Sep 17 00:00:00 2001 From: Timur Tabi <timur@freescale.com> Date: Fri, 4 Sep 2009 17:05:24 -0500 Subject: [PATCH] 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> --- drivers/misc/fsl_law.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/misc/fsl_law.c b/drivers/misc/fsl_law.c index 147fe0a21c8..7bdd355c745 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) -- GitLab