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Subject: Re: [PATCH] drm/bridge: tc358764: Fix build error
To:     YueHaibing <yuehaibing@huawei.com>, a.hajda@samsung.com,
        Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
        jernej.skrabec@siol.net, airlied@linux.ie, daniel@ffwll.ch
Cc:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
References: <20190729090520.25968-1-yuehaibing@huawei.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <a7fb2600-2add-8769-f8dc-6679680974c1@baylibre.com>
Date:   Tue, 30 Jul 2019 14:32:19 +0200
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In-Reply-To: <20190729090520.25968-1-yuehaibing@huawei.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 29/07/2019 11:05, YueHaibing wrote:
> If CONFIG_DRM_TOSHIBA_TC358764=y but CONFIG_DRM_KMS_HELPER=m,
> building fails:
> 
> drivers/gpu/drm/bridge/tc358764.o:(.rodata+0x228): undefined reference to `drm_atomic_helper_connector_reset'
> drivers/gpu/drm/bridge/tc358764.o:(.rodata+0x240): undefined reference to `drm_helper_probe_single_connector_modes'
> drivers/gpu/drm/bridge/tc358764.o:(.rodata+0x268): undefined reference to `drm_atomic_helper_connector_duplicate_state'
> drivers/gpu/drm/bridge/tc358764.o:(.rodata+0x270): undefined reference to `drm_atomic_helper_connector_destroy_state'
> 
> Like TC358767, select DRM_KMS_HELPER to fix this, and
> change to select DRM_PANEL to avoid recursive dependency.
> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Fixes: f38b7cca6d0e ("drm/bridge: tc358764: Add DSI to LVDS bridge driver")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/gpu/drm/bridge/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index a6eec90..323f72d 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -116,9 +116,10 @@ config DRM_THINE_THC63LVD1024
>  
>  config DRM_TOSHIBA_TC358764
>  	tristate "TC358764 DSI/LVDS bridge"
> -	depends on DRM && DRM_PANEL
>  	depends on OF
>  	select DRM_MIPI_DSI
> +	select DRM_KMS_HELPER
> +	select DRM_PANEL
>  	help
>  	  Toshiba TC358764 DSI/LVDS bridge driver.
>  
> 

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>