linux-kernel - [PATCH 1/1] ARM: imx: build suspend-imx6.S with arm instruction set

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Message-Id: <20210111151704.26296-2-max.krummenacher@toradex.com>
Date:   Mon, 11 Jan 2021 16:17:04 +0100
From:   Max Krummenacher <max.oss.09@...il.com>
To:     Max Krummenacher <max.oss.09@...il.com>
Cc:     Max Krummenacher <max.krummenacher@...adex.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Fabio Estevam <festevam@...il.com>,
        Rouven Czerwinski <r.czerwinski@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        NXP Linux Team <linux-imx@....com>
Subject: [PATCH 1/1] ARM: imx: build suspend-imx6.S with arm instruction set

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@...adex.com>

---

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

diff --git a/arch/arm/mach-imx/suspend-imx6.S b/arch/arm/mach-imx/suspend-imx6.S
index 1eabf2d2834be..e06f946b75b96 100644
--- a/arch/arm/mach-imx/suspend-imx6.S
+++ b/arch/arm/mach-imx/suspend-imx6.S
@@ -67,6 +67,7 @@
 #define MX6Q_CCM_CCR	0x0
 
 	.align 3
+	.arm
 
 	.macro  sync_l2_cache
 
-- 
2.26.2