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

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Date:   Mon, 25 Oct 2021 09:25:33 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Julian Braha <julianbraha@...il.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jagan Teki <jagan@...rulasolutions.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <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 catching this.

On Mon, 25 Oct 2021 at 05:44, Julian Braha <julianbraha@...il.com> 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.

Could you add a Fixes tag to this commit.

ce517f18944e - drm: bridge: Add Chipone ICN6211 MIPI-DSI to RGB bridge

With that, resubmit with my r-b.
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
> --
> 2.30.2
>