linux-kernel - Re: [PATCH] drivers: gpu: drm: bridge: fix kconfig dependency on DRM_KMS

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Date:   Thu, 1 Apr 2021 16:39:11 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Julian Braha <julianbraha@...il.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: gpu: drm: bridge: fix kconfig dependency on DRM_KMS_HELPER

Hey Julian,

Nice catch, this patch looks good to me. I've pushed it to drm-misc-next.

https://cgit.freedesktop.org/drm/drm-misc/commit/?id=62066d3164467167fc27b2383f67d097e39bf176

On Mon, 22 Feb 2021 at 22:56, Julian Braha <julianbraha@...il.com> wrote:
>
> When DRM_TOSHIBA_TC358762 is enabled and DRM_KMS_HELPER is disabled,
> 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_TOSHIBA_TC358762 [=y] && HAS_IOMEM [=y] && DRM [=y] && DRM_BRIDGE [=y] && OF [=y]
>
> This is because DRM_TOSHIBA_TC358762 selects DRM_PANEL_BRIDGE,
> without depending on or selecting DRM_KMS_HELPER,
> despite that config option depending on DRM_KMS_HELPER.
>
> 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 e4110d6ca7b3..909d0a5643c2 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -183,6 +183,7 @@ config DRM_TOSHIBA_TC358762
>         tristate "TC358762 DSI/DPI bridge"
>         depends on OF
>         select DRM_MIPI_DSI
> +       select DRM_KMS_HELPER
>         select DRM_PANEL_BRIDGE
>         help
>           Toshiba TC358762 DSI/DPI bridge driver.
> --
> 2.27.0