linux-kernel - Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that resume in ARM state

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Message-ID: <20150602234048.GA7557@n2100.arm.linux.org.uk>
Date:	Wed, 3 Jun 2015 00:40:48 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Kevin Hilman <khilman@...aro.org>,
	Andy Gross <agross@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Lina Iyer <lina.iyer@...aro.org>
Subject: Re: [PATCH v2 1/2] ARM: Add cpu_resume_arm() for firmwares that
 resume in ARM state

On Tue, Jun 02, 2015 at 12:12:57PM -0700, Stephen Boyd wrote:
> Some platforms always enter the kernel in the ARM state even if
> the kernel is compiled for THUMB2. Add a small wrapper on top of
> cpu_resume() that switches into THUMB2 state.
> 
> This fixes a problem reported by Kevin Hilman on next-20150601
> where the ifc6410 fails to boot a THUMB2 kernel because the
> platform's firmware always enters the kernel in ARM mode from
> deep idle states.

I think this bit of the commit message isn't quite correct: this will
only resolve the boot problem with a T2 kernel when the failing platform
is converted to use the cpu_resume_arm() entry point.

Apart from that, the patch looks good to me, thanks.

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