Re: [PATCH v2] drm/vc4: Unselect PM

From: Nathan Chancellor <nathan@kernel.org>
To: Maxime Ripard <maxime@cerno.tech>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-rpi-kernel@lists.infradead.org,
	Florian Fainelli <f.fainelli@gmail.com>,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	Randy Dunlap <rdunlap@infradead.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH v2] drm/vc4: Unselect PM
Date: Fri, 24 Sep 2021 08:46:32 -0700	[thread overview]
Message-ID: <YU3y2AUpnSKHMZOO@archlinux-ax161> (raw)
In-Reply-To: <20210924152334.1342630-1-maxime@cerno.tech>

On Fri, Sep 24, 2021 at 05:23:34PM +0200, Maxime Ripard wrote:
> It turns out we can't select PM when allowing the compilation for
> COMPILE_TEST. Indeed, PM might not be defined at all, or come with extra
> requirements we can't meet.
> 
> This select was initially introduced since we need to call the
> vc4_hdmi_runtime_resume() at probe time to make sure our device is
> properly powered at bind time, no matter whether PM is there or not, and
> we needed to make sure we didn't have a defined but not used warning for
> vc4_hdmi_runtime_suspend().
> 
> This will still happen on platforms that don't define PM though, since
> SET_RUNTIME_PM_OPS will then be a nop. In order to fix both issues,
> let's remove the select, and add a __maybe_unused attribute to
> vc4_hdmi_runtime_resume().
> 
> Reported-by: Randy Dunlap <rdunlap@infradead.org>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org> # build

> ---
> 
> I'm not sure how to merge this one, since this commit has been reverted
> in Linus tree, and un-reverted in linux-next. Should we wait a bit until
> the reworked version of the original commit has been merged again?
> 
> Maxime
> 
> Changes from v1:
>   - remove select
>   - add __maybe_unused to vc4_hdmi_runtime_resume
>   - reword the commit log
> ---
>  drivers/gpu/drm/vc4/Kconfig    | 1 -
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
>  2 files changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vc4/Kconfig b/drivers/gpu/drm/vc4/Kconfig
> index 52a1c309cb4a..345a5570a3da 100644
> --- a/drivers/gpu/drm/vc4/Kconfig
> +++ b/drivers/gpu/drm/vc4/Kconfig
> @@ -9,7 +9,6 @@ config DRM_VC4
>  	select DRM_KMS_CMA_HELPER
>  	select DRM_GEM_CMA_HELPER
>  	select DRM_PANEL_BRIDGE
> -	select PM
>  	select SND_PCM
>  	select SND_PCM_ELD
>  	select SND_SOC_GENERIC_DMAENGINE_PCM
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 500cdd56b335..1f2690ed8542 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -2122,7 +2122,7 @@ static int vc5_hdmi_init_resources(struct vc4_hdmi *vc4_hdmi)
>  	return 0;
>  }
>  
> -static int vc4_hdmi_runtime_suspend(struct device *dev)
> +static int __maybe_unused vc4_hdmi_runtime_suspend(struct device *dev)
>  {
>  	struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
>  
> -- 
> 2.31.1
> 

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