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Date:   Tue, 7 Jan 2020 23:54:14 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
        Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm: of: fix link error
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Hi Arnd,

Thank you for the patch.

On Tue, Jan 07, 2020 at 10:37:32PM +0100, Arnd Bergmann wrote:
> The new dummy helper is non-static, so every driver gets
> its own copy, leading to a link failure:
> 
> drivers/gpu/drm/imx/imx-ldb.o: In function `drm_of_lvds_get_dual_link_pixel_order':
> imx-ldb.c:(.text+0x140): multiple definition of `drm_of_lvds_get_dual_link_pixel_order'
> drivers/gpu/drm/imx/imx-drm-core.o:imx-drm-core.c:(.text+0x330): first defined here
> drivers/gpu/drm/imx/dw_hdmi-imx.o: In function `drm_of_lvds_get_dual_link_pixel_order':
> dw_hdmi-imx.c:(.text+0xd0): multiple definition of `drm_of_lvds_get_dual_link_pixel_order'
> drivers/gpu/drm/imx/imx-drm-core.o:imx-drm-core.c:(.text+0x330): first defined here
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.o: In function `drm_of_lvds_get_dual_link_pixel_order':
> dw-hdmi.c:(.text+0x3b90): multiple definition of `drm_of_lvds_get_dual_link_pixel_order'
> drivers/gpu/drm/imx/imx-drm-core.o:imx-drm-core.c:(.text+0x330): first defined here
> drivers/gpu/drm/etnaviv/etnaviv_drv.o: In function `drm_of_lvds_get_dual_link_pixel_order':
> etnaviv_drv.c:(.text+0x9d0): multiple definition of `drm_of_lvds_get_dual_link_pixel_order'
> drivers/gpu/drm/imx/imx-drm-core.o:imx-drm-core.c:(.text+0x330): first defined here
> 
> Add the missing 'static' keyword.
> 
> Fixes: 6529007522de ("drm: of: Add drm_of_lvds_get_dual_link_pixel_order")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

I've sent "[PATCH] drm: of: Fix linking when CONFIG_OF is not set" to
fix this issue, back on December the 19th. Daniel, Dave, could you pick
this up ? It couldn't be merged through drm-misc last time we checked as
the offending patch wasn't there.

> ---
>  include/drm/drm_of.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
> index 8ec7ca6d2369..3398be966021 100644
> --- a/include/drm/drm_of.h
> +++ b/include/drm/drm_of.h
> @@ -92,7 +92,7 @@ static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
>  	return -EINVAL;
>  }
>  
> -int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
> +static inline int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
>  					  const struct device_node *port2)
>  {
>  	return -EINVAL;

-- 
Regards,

Laurent Pinchart