[PATCH 4.19 20/37] ARM: imx: build suspend-imx6.S with arm instruction set

Greg Kroah-Hartman
2021-02-02T14:51:11Z

From: Max Krummenacher <max.oss.09@gmail.com>

commit a88afa46b86ff461c89cc33fc3a45267fff053e8 upstream.

When the kernel is configured to use the Thumb-2 instruction set
"suspend-to-memory" fails to resume. Observed on a Colibri iMX6ULL
(i.MX 6ULL) and Apalis iMX6 (i.MX 6Q).

It looks like the CPU resumes unconditionally in ARM instruction mode
and then chokes on the presented Thumb-2 code it should execute.

Fix this by using the arm instruction set for all code in
suspend-imx6.S.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Fixes: df595746fa69 ("ARM: imx: add suspend in ocram support for i.mx6q")
Acked-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/arm/mach-imx/suspend-imx6.S | 1 +
1 file changed, 1 insertion(+)

--- a/arch/arm/mach-imx/suspend-imx6.S
+++ b/arch/arm/mach-imx/suspend-imx6.S
@@ -73,6 +73,7 @@
#define MX6Q_CCM_CCR 0x0

.align 3
+ .arm

.macro sync_l2_cache