Message-ID: <1502190973.2934.69.camel@pengutronix.de>
Subject: Re: [PATCH 3/3] drm/etnaviv: add thermal dependency
From: Lucas Stach <l.stach@pengutronix.de>
To: Arnd Bergmann <arnd@arndb.de>
Cc: dri-devel@lists.freedesktop.org,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org>,
        Russell King <linux+etnaviv@armlinux.org.uk>,
        Christian Gmeiner <christian.gmeiner@gmail.com>,
        David Airlie <airlied@linux.ie>,
        Patrik Jakobsson <patrik.r.jakobsson@gmail.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Ben Skeggs <bskeggs@redhat.com>, Darren Hart <dvhart@infradead.org>,
        Andy Shevchenko <andy@infradead.org>,
        Jens Frederich <jfrederich@gmail.com>, Daniel Drake <dsd@laptop.org>,
        Jon Nettleton <jon.nettleton@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
        etnaviv@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
        nouveau@lists.freedesktop.org, platform-driver-x86@vger.kernel.org,
        devel@driverdev.osuosl.org
Date: Tue, 08 Aug 2017 13:16:13 +0200
In-Reply-To: <20170726135312.2214309-4-arnd@arndb.de>
References: <20170726135312.2214309-1-arnd@arndb.de>
         <20170726135312.2214309-4-arnd@arndb.de>
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Hi Arnd,

Am Mittwoch, den 26.07.2017, 15:53 +0200 schrieb Arnd Bergmann:
> When CONFIG_THERMAL is enabled as a loadable module, and etnaviv is
> built-in, we get a link error:
> 
> drivers/gpu/drm/etnaviv/etnaviv_gpu.o: In function `etnaviv_gpu_bind':
> etnaviv_gpu.c:(.text.etnaviv_gpu_bind+0x34): undefined reference to `thermal_of_cooling_device_register'
> etnaviv_gpu.c:(.text.etnaviv_gpu_bind+0xe0): undefined reference to `thermal_cooling_device_unregister'
> drivers/gpu/drm/etnaviv/etnaviv_gpu.o: In function `etnaviv_gpu_unbind':
> etnaviv_gpu.c:(.text.etnaviv_gpu_unbind+0xf0): undefined reference to `thermal_cooling_device_unregister'
> 
> This adds a Kconfig dependency to prevent etnaviv from being built-in
> with CONFIG_THERMAL=m, while still allowing the valid configurations.
> Unfortunately, simply adding the dependency here breaks Kconfig through
> a dependency loop involving lots of symbols all the way until ACPI_VIDEO,
> which is the only video driver that explicitly selects 'THERMAL'. Turning
> this into a 'depends on' addresses the problem.
> For completeness, I'm also removing the redundant 'select THERMAL'
> from INTEL_MENLOW, so no other driver uses that statement.
> 
> Fixes: bcdfb5e56dc5 ("drm/etnaviv: add etnaviv cooling device")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> v2: spend more thought on ACPI_VIDEO dependencies, as we need another
>     patch before this.
> ---
>  drivers/acpi/Kconfig            | 2 +-
>  drivers/gpu/drm/etnaviv/Kconfig | 1 +
>  drivers/platform/x86/Kconfig    | 1 -

I would like to take this patch, but I'm not sure why it includes x86
and ACPI hunks.

Regards,
Lucas

>  3 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index a8f5a40e2914..1282b2936164 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -184,7 +184,7 @@ config ACPI_VIDEO
>  	tristate "Video"
>  	depends on X86
>  	depends on INPUT
> -	select THERMAL
> +	depends on THERMAL
>  	select BACKLIGHT_CLASS_DEVICE
>  	select BACKLIGHT_LCD_SUPPORT
>  	default y
> diff --git a/drivers/gpu/drm/etnaviv/Kconfig b/drivers/gpu/drm/etnaviv/Kconfig
> index 71cee4e9fefb..1d6c744e7924 100644
> --- a/drivers/gpu/drm/etnaviv/Kconfig
> +++ b/drivers/gpu/drm/etnaviv/Kconfig
> @@ -3,6 +3,7 @@ config DRM_ETNAVIV
>  	tristate "ETNAVIV (DRM support for Vivante GPU IP cores)"
>  	depends on DRM
>  	depends on ARCH_MXC || ARCH_DOVE || (ARM && COMPILE_TEST)
> +	depends on THERMAL || THERMAL=n
>  	depends on MMU
>  	select SHMEM
>  	select SYNC_FILE
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 2d9fb46a8d11..d9238e9ff54a 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -532,7 +532,6 @@ config SENSORS_HDAPS
>  config INTEL_MENLOW
>  	tristate "Thermal Management driver for Intel menlow platform"
>  	depends on ACPI_THERMAL
> -	select THERMAL
>  	---help---
>  	  ACPI thermal management enhancement driver on
>  	  Intel Menlow platform.