linux-kernel - Re: [PATCH] ARM: tegra20: Store CPU "resettable" status in IRAM

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Date:	Tue, 20 Jan 2015 10:59:56 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Dmitry Osipenko <digetx@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stable <stable@...r.kernel.org>
Subject: Re: [PATCH] ARM: tegra20: Store CPU "resettable" status in IRAM

On Mon, Jan 19, 2015 at 11:12 PM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Thu, Jan 15, 2015 at 01:58:57PM +0300, Dmitry Osipenko wrote:
>> Commit 7232398abc6a ("ARM: tegra: Convert PMC to a driver") changed tegra_resume()
>> location storing from late to early and, as a result, broke suspend on Tegra20.
>> PMC scratch register 41 is used by tegra LP1 resume code for retrieving stored
>> physical memory address of common resume function and in the same time used by
>> tegra20_cpu_shutdown() (shared by Tegra20 cpuidle driver and platform SMP code),
>> which is storing CPU1 "resettable" status. It implies strict order of scratch
>> register usage, otherwise resume function address is lost on Tegra20 after
>> disabling non-boot CPU's on suspend. Fix it by storing "resettable" status in
>> IRAM instead of PMC scratch register.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> Fixes: 7232398abc6a (ARM: tegra: Convert PMC to a driver)
>> Cc: <stable@...r.kernel.org> # v3.17+
>> ---
>>  arch/arm/mach-tegra/cpuidle-tegra20.c |  5 ++---
>>  arch/arm/mach-tegra/reset-handler.S   | 10 +++++++---
>>  arch/arm/mach-tegra/reset.h           |  4 ++++
>>  arch/arm/mach-tegra/sleep-tegra20.S   | 37 ++++++++++++++++++++---------------
>>  arch/arm/mach-tegra/sleep.h           |  4 ++++
>>  5 files changed, 38 insertions(+), 22 deletions(-)
>
> I'm leaning towards applying this. Stephen, Alex, Peter: any objections?

None from me ; but I am not qualified to give an valuable opinion on
this part of the code.
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