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

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Message-ID: <20210118064512.GK28365@dragon>
Date:   Mon, 18 Jan 2021 14:45:13 +0800
From:   Shawn Guo <shawnguo@...nel.org>
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>,
        NXP Linux Team <linux-imx@....com>
Subject: Re: [PATCH 1/1] ARM: imx: build suspend-imx6.S with arm instruction
 set

On Mon, Jan 11, 2021 at 04:17:04PM +0100, Max Krummenacher wrote:
> 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>

Applied, thanks.