[PATCH] scmi: correctly configure MMU for SCMI buffer

[Patrick Delaunay]

Align the MMU area for SCMI shared buffer on section size;
use the ALIGN macro in mmu_set_region_dcache_behaviour call.

Since commit d877f8fd0f09 ("arm: provide a function for boards init
code to modify MMU virtual-physical map") the parameter of
mmu_set_region_dcache_behaviour need to be MMU_SECTION_SIZE
aligned.

Fixes: 240720e9052f ("firmware: scmi: mailbox/smt agent device")
Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 drivers/firmware/scmi/smt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/scmi/smt.c b/drivers/firmware/scmi/smt.c
index d25478796a..3c41013bca 100644
--- a/drivers/firmware/scmi/smt.c
+++ b/drivers/firmware/scmi/smt.c
@@ -54,8 +54,10 @@ int scmi_dt_get_smt_buffer(struct udevice *dev, struct scmi_smt *smt)
 
 #ifdef CONFIG_ARM
 	if (dcache_status())
-		mmu_set_region_dcache_behaviour((uintptr_t)smt->buf,
-						smt->size, DCACHE_OFF);
+		mmu_set_region_dcache_behaviour(ALIGN_DOWN((uintptr_t)smt->buf, MMU_SECTION_SIZE),
+						ALIGN(smt->size, MMU_SECTION_SIZE),
+						DCACHE_OFF);
+
 #endif
 
 	return 0;
-- 
2.17.1