linux-kernel - Re: [PATCH] drm/imx: select DRM_DISPLAY

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Message-ID: <191ee8f8-b48a-44be-9b2a-3690a362c541@oss.qualcomm.com>
Date: Thu, 4 Dec 2025 11:47:28 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Arnd Bergmann <arnd@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
        Dmitry Baryshkov <lumag@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, dri-devel@...ts.freedesktop.org,
        imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/imx: select DRM_DISPLAY_HELPER as needed

On 04/12/2025 11:46, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> CONFIG_DRM_BRIDGE_CONNECTOR is a bool option that turns on features of
> the display helpers, which are in a module controlled by the (tristate)
> CONFIG_DRM_DISPLAY_HELPER. If the display helpers are in a loadable
> module, a built-in driver trying to use the bridge connectors fails
> to link:
> 
> x86_64-linux-ld: drivers/gpu/drm/imx/ipuv3/parallel-display.o: in function `imx_pd_bind':
> parallel-display.c:(.text+0xcd): undefined reference to `drm_bridge_connector_init'
> x86_64-linux-ld: drivers/gpu/drm/imx/ipuv3/imx-ldb.o: in function `imx_ldb_bind':
> imx-ldb.c:(.text+0x224): undefined reference to `drm_bridge_connector_init'
> 
> Select the DRM_BRIDGE_CONNECTOR symbol as well, to ensure it's built-in
> if anything needs it.
> 
> Fixes: f94b9707a1c9 ("drm/imx: parallel-display: switch to imx_legacy_bridge / drm_bridge_connector")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/gpu/drm/imx/ipuv3/Kconfig | 2 ++
>   1 file changed, 2 insertions(+)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

-- 
With best wishes
Dmitry