[PATCH v3] drm: bridge: fix unmet dependency on DRM_KMS_HELPER for DRM_PANEL_BRIDGE

[Robert Foss]

On Mon, 17 Jan 2022 at 06:22, Julian Braha <julianbraha at gmail.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.
>
> Fixes: ce517f18944e ("drm: bridge: Add Chipone ICN6211 MIPI-DSI to RGB bridge")
> Reviewed-by: Robert Foss <robert.foss at linaro.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Signed-off-by: Julian Braha <julianbraha at gmail.com>
> ---
> v2:
> - changed from "select" to "depends on"
>
> v3:
> - new line now uses tabs instead of spaces.
>
>  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 61db5a66b493..a1b52eaf26e0 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
> +       depends on DRM_KMS_HELPER
>         select DRM_MIPI_DSI
>         select DRM_PANEL_BRIDGE
>         help
> --

Applied to drm-misc-next.