From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
Subject: Re: [PATCH 06/11] ARM: tegra114: hook tegra_tear_down_cpu function
Date: Thu, 27 Jun 2013 11:48:49 -0600
Message-ID: <51CC7B01.30503@wwwdotorg.org>
References: <1372152475-18617-1-git-send-email-josephl@nvidia.com> <1372152475-18617-7-git-send-email-josephl@nvidia.com> <20130627101335.GB15081@mithrandir>
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To: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Joseph Lo <josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
List-Id: linux-tegra@vger.kernel.org

On 06/27/2013 04:13 AM, Thierry Reding wrote:
> On Tue, Jun 25, 2013 at 05:27:50PM +0800, Joseph Lo wrote:
>> Hooking tegra_tear_down_cpu for Tegra114 for supporting cluster
>> power down when CPU cluster suspneded in LP2.
>> 
>> Signed-off-by: Joseph Lo <josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> --- 
>> arch/arm/mach-tegra/pm.c | 1 + 1 file changed, 1 insertion(+)
>> 
>> diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c 
>> index 94e69be..a0668a2 100644 --- a/arch/arm/mach-tegra/pm.c +++
>> b/arch/arm/mach-tegra/pm.c @@ -52,6 +52,7 @@ static void
>> tegra_tear_down_cpu_init(void) tegra_tear_down_cpu =
>> tegra20_tear_down_cpu; break; case TEGRA30: +	case TEGRA114: if
>> (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC)) tegra_tear_down_cpu =
>> tegra30_tear_down_cpu;
> 
> This is getting a little weird. Suppose I want to build a Tegra114
> only kernel. With the above code it means the tegra_tear_down_cpu
> won't be hooked because ARCH_TEGRA_3x_SOC isn't selected.
> 
> Perhaps tegra30_tear_down_cpu() should be built unconditionally so
> that it's always available? I suspect that something similar will
> need to be done for future chips too, further complicating
> matters.
> 
> There are other alternatives like adding another Kconfig symbol
> which doesn't cover all of Tegra30 but only code shared with
> Tegra114 (and possible future chips) or building sleep-tegra30.S if
> either one of the ARCH_TEGRA_3x_SOC or ARCH_TEGRA_114_SOC symbols
> is selected.

To be honest, I wonder if we should just get rid of ARCH_TEGRA_*_SOC,
and build everything if ARCH_TEGRA is defined. tegra_defconfig enables
all ARCH_TEGRA_*_SOC anyway, and I'm afraid I don't test other
configurations very often, and I assume that distros will enable
everything...