linux-kernel - Re: [PATCH] drm: bridge: fix unmet dependency on DRM_KMS_HELPER for DRM_PANEL

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Message-ID: <YXbtt2M+I41qH2ME@pendragon.ideasonboard.com>
Date:   Mon, 25 Oct 2021 20:47:35 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Julian Braha <julianbraha@...il.com>
Cc:     robert.foss@...aro.org, a.hajda@...sung.com,
        narmstrong@...libre.com, jonas@...boo.se, jernej.skrabec@...il.com,
        airlied@...ux.ie, daniel@...ll.ch, jagan@...rulasolutions.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: bridge: fix unmet dependency on DRM_KMS_HELPER for
 DRM_PANEL_BRIDGE

Hi Julian,

Thank you for the patch.

On Mon, Oct 25, 2021 at 01:42:02PM -0400, Julian Braha wrote:
> When DRM_CHIPONE_ICN6211 is selected, and DRM_KMS_HELPER is not selected,
> Kbuild gives the following warning:
> 
> WARNING: unmet direct dependencies detected for DRM_PANEL_BRIDGE
>   Depends on [n]: HAS_IOMEM [=y] && DRM_BRIDGE [=y] && DRM_KMS_HELPER [=n]
>   Selected by [y]:
>   - DRM_CHIPONE_ICN6211 [=y] && HAS_IOMEM [=y] && DRM [=y] && DRM_BRIDGE [=y] && OF [=y]
> 
> This is because DRM_CHIPONE_ICN6211 selects DRM_PANEL_BRIDGE
> without depending on or selecting DRM_KMS_HELPER,
> despite DRM_PANEL_BRIDGE depending on DRM_KMS_HELPER.
> 
> This unmet dependency bug was detected by Kismet,
> a static analysis tool for Kconfig.
> Please advise if this is not the appropriate solution.

Shouldn't DRM_PANEL_BRIDGE select DRM_KMS_HELPER instead of depending on
it ?

> Fixes: ce517f18944e ("drm: bridge: Add Chipone ICN6211 MIPI-DSI to RGB bridge")
> Reviewed-by: Robert Foss <robert.foss@...aro.org>
> Signed-off-by: Julian Braha <julianbraha@...il.com>
> ---
>  drivers/gpu/drm/bridge/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 431b6e12a81f..a630cb8fd1c8 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -30,6 +30,7 @@ config DRM_CDNS_DSI
>  config DRM_CHIPONE_ICN6211
>  	tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge"
>  	depends on OF
> +  select DRM_KMS_HELPER
>  	select DRM_MIPI_DSI
>  	select DRM_PANEL_BRIDGE
>  	help

-- 
Regards,

Laurent Pinchart