linux-kernel - Re: [PATCH] drm/rockchip: add extcon dependency for DP

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Message-ID: <CABXOdTfebR3aA-txoAzLh=U30uLGWe=Lrz4EF8VYhR6bSJEwww@mail.gmail.com>
Date:   Tue, 14 Feb 2017 14:06:33 -0800
From:   Guenter Roeck <groeck@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mark Yao <mark.yao@...k-chips.com>,
        David Airlie <airlied@...ux.ie>,
        Sean Paul <seanpaul@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Yakir Yang <ykk@...k-chips.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chris Zhong <zyw@...k-chips.com>,
        Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/rockchip: add extcon dependency for DP

On Tue, Feb 14, 2017 at 1:31 PM, Arnd Bergmann <arnd@...db.de> wrote:
> The newly added DP driver links against the extcon core, which fails when
> extcon is a module and this driver is not:
>
> drivers/gpu/drm/rockchip/cdn-dp-core.o: In function `cdn_dp_get_port_lanes':
> cdn-dp-core.c:(.text.cdn_dp_get_port_lanes+0x24): undefined reference to `extcon_get_state'
> cdn-dp-core.c:(.text.cdn_dp_get_port_lanes+0x44): undefined reference to `extcon_get_property'
>
> Let's make Kconfig enforce correct behavior with a dependency.
>
> Fixes: 1a0f7ed3abe2 ("drm/rockchip: cdn-dp: add cdn DP support for rk3399")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  drivers/gpu/drm/rockchip/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index ad31b3eb408f..0e4eb845cbb0 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -24,6 +24,7 @@ config ROCKCHIP_ANALOGIX_DP
>  config ROCKCHIP_CDN_DP
>          tristate "Rockchip cdn DP"
>          depends on DRM_ROCKCHIP
> +       depends on EXTCON
>         select SND_SOC_HDMI_CODEC if SND_SOC
>          help
>           This selects support for Rockchip SoC specific extensions
> --
> 2.9.0
>