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.
Signed-off-by: Timur Tabi timur@freescale.com --- drivers/misc/fsl_law.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
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)