linux-kernel - Re: [PATCH v2 -next] drm/rockchip: Fix Kconfig dependencies

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Date:   Sat, 7 May 2022 21:09:25 +0800
From:   Andy Yan <andy.yan@...k-chips.com>
To:     Ren Zhijie <renzhijie2@...wei.com>, hjc@...k-chips.com,
        heiko@...ech.de, airlied@...ux.ie, daniel@...ll.ch,
        lyude@...hat.com, tzimmermann@...e.de
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 -next] drm/rockchip: Fix Kconfig dependencies

Hi Zhijie:

On 5/7/22 18:09, Ren Zhijie wrote:
> drivers/gpu/drm/rockchip/cdn-dp-core.o: In function `cdn_dp_connector_mode_valid':
> cdn-dp-core.c:(.text+0x1e1): undefined reference to `drm_dp_bw_code_to_link_rate'
> cdn-dp-core.c:(.text+0x1f4): undefined reference to `drm_dp_bw_code_to_link_rate'
> drivers/gpu/drm/rockchip/cdn-dp-core.o: In function `cdn_dp_pd_event_work':
> cdn-dp-core.c:(.text+0x138e): undefined reference to `drm_dp_channel_eq_ok'
> drivers/gpu/drm/rockchip/cdn-dp-reg.o: In function `cdn_dp_train_link':
> cdn-dp-reg.c:(.text+0xd5a): undefined reference to `drm_dp_bw_code_to_link_rate'
>
> The DP-helper module has been replaced by the display-helper module.
> So the driver have to select it.
>
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 1e0f66420b13("drm/display: Introduce a DRM display-helper module")
> Signed-off-by: Ren Zhijie <renzhijie2@...wei.com>

Thanks.

Reviewed-by: Andy Yan <andy.yan@...k-chips.com>

> ---
> v2: remove "select DRM_DISPLAY_HELPER if ROCKCHIP_ANALOGIX_DP" under DRM_ROCKCHIP at the head,
> and separately add the select for ROCKCHIP_ANALOGIX_DP and ROCKCHIP_CDN_DP, which Andy suggested.
> ---
> ---
>   drivers/gpu/drm/rockchip/Kconfig | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index 5afab49dc4f2..53c2d9980d48 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -2,7 +2,6 @@
>   config DRM_ROCKCHIP
>   	tristate "DRM Support for Rockchip"
>   	depends on DRM && ROCKCHIP_IOMMU
> -	select DRM_DISPLAY_HELPER if ROCKCHIP_ANALOGIX_DP
>   	select DRM_GEM_CMA_HELPER
>   	select DRM_KMS_HELPER
>   	select DRM_PANEL
> @@ -38,6 +37,7 @@ config ROCKCHIP_VOP2
>   config ROCKCHIP_ANALOGIX_DP
>   	bool "Rockchip specific extensions for Analogix DP driver"
>   	depends on ROCKCHIP_VOP
> +	select DRM_DISPLAY_HELPER
>   	select DRM_DISPLAY_DP_HELPER
>   	help
>   	  This selects support for Rockchip SoC specific extensions
> @@ -47,6 +47,8 @@ config ROCKCHIP_ANALOGIX_DP
>   config ROCKCHIP_CDN_DP
>   	bool "Rockchip cdn DP"
>   	depends on EXTCON=y || (EXTCON=m && DRM_ROCKCHIP=m)
> +	select DRM_DISPLAY_HELPER
> +	select DRM_DISPLAY_DP_HELPER
>   	help
>   	  This selects support for Rockchip SoC specific extensions
>   	  for the cdn DP driver. If you want to enable Dp on