linux-kernel - Re: [PATCH] drm/tegra: mark t186 display hub PM functions __maybe

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Date:   Fri, 15 Dec 2017 14:36:37 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:TEGRA ARCHITECTURE SUPPORT" <linux-tegra@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/tegra: mark t186 display hub PM functions __maybe_unused

On Fri, Dec 15, 2017 at 2:33 PM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Fri, Dec 15, 2017 at 01:51:52PM +0100, Arnd Bergmann wrote:
>> The newly introduced driver has optional suspend/resume functions,
>> causing a warning when CONFIG_PM is disabled:
>>
>> drivers/gpu/drm/tegra/hub.c:749:12: error: 'tegra_display_hub_resume' defined but not used [-Werror=unused-function]
>> drivers/gpu/drm/tegra/hub.c:733:12: error: 'tegra_display_hub_suspend' defined but not used [-Werror=unused-function]
>>
>> This marks them __maybe_unused to shut up the warnings.
>>
>> Fixes: c4755fb9064f ("drm/tegra: Add Tegra186 display hub support")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/gpu/drm/tegra/hub.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> We had touched on this topic in a different thread. The Tegra DRM driver
> currently relies on runtime PM to work properly. I don't see a reason to
> not make that official by adding a select PM to menuconfig ARCH_TEGRA on
> 32-bit ARM just like we already do on 64-bit ARM.
>
> I've gone and applied this patch as an interim solution. Once we've made
> the switch to select PM on all generations of Tegra we can remove all
> the #ifdef and __maybe_unused.

Sounds good, thanks!

       Arnd