linux-kernel - Re: [PATCH] drm/bridge: Select DRM_KMS_HELPER for DRM_PANEL

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Date: Mon, 18 Mar 2024 15:41:56 +0200
From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Luca Weiss <luca.weiss@...rphone.com>,
	~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: Select DRM_KMS_HELPER for DRM_PANEL_BRIDGE

On Mon, Mar 18, 2024 at 12:52:10PM +0200, Jani Nikula wrote:
> On Mon, 18 Mar 2024, Neil Armstrong <neil.armstrong@...aro.org> wrote:
> > Hi,
> >
> > On Thu, 11 Jan 2024 13:38:04 +0100, Luca Weiss wrote:
> >> Since the kconfig symbol of DRM_PANEL_BRIDGE is only adding
> >> bridge/panel.o to drm_kms_helper object, we need to select
> >> DRM_KMS_HELPER to make sure the file is actually getting built.
> >> 
> >> Otherwise with certain defconfigs e.g. devm_drm_of_get_bridge will not
> >> be properly available:
> >> 
> >> [...]
> >
> > Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-fixes)
> >
> > [1/1] drm/bridge: Select DRM_KMS_HELPER for DRM_PANEL_BRIDGE
> >       https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/e3f18b0dd1db242791afbc3bd173026163ce0ccc
> 
> With my kernel config, e3f18b0dd1db ("drm/bridge: Select DRM_KMS_HELPER
> for DRM_PANEL_BRIDGE") leads to:
> 
> WARNING: unmet direct dependencies detected for DRM_KMS_HELPER
>   Depends on [m]: HAS_IOMEM [=y] && DRM [=m]
..

All the defconfigs in drm-rerere also seem to fail here.

Neil, are you using some weird .config, or did you not actually
build test this before pushing?

PS. the drm-rerere defconfigs seem pretty outdated (eg. missing
    tons of panel drivers). Would be good if someone could update
    those to provide better coverage

-- 
Ville Syrjälä
Intel