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Message-ID: <CAK8P3a0CoPUTSJp6ddDnmabo59iE73pugGSYayoeB5N57az9_w@mail.gmail.com>
Date: Wed, 15 Apr 2020 21:07:14 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Nicolas Pitre <nico@...xnic.net>,
Andrzej Hajda <a.hajda@...sung.com>,
Neil Armstrong <narmstrong@...libre.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...l.net>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
"David S. Miller" <davem@...emloft.net>,
Saeed Mahameed <saeedm@...lanox.com>,
Leon Romanovsky <leon@...nel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
Networking <netdev@...r.kernel.org>,
linux-rdma <linux-rdma@...r.kernel.org>
Subject: Re: [RFC 5/6] drm/rcar-du: fix selection of CMM driver
On Wed, Apr 15, 2020 at 5:18 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On Wed, Apr 15, 2020 at 4:13 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Wed, Apr 15, 2020 at 3:47 PM Arnd Bergmann <arnd@...db.de> wrote:
> > > On Tue, Apr 14, 2020 at 10:52 PM Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:
> > > > Doesn't "imply" mean it gets selected by default but can be manually
> > > > disabled ?
> > >
> > > That may be what it means now (I still don't understand how it's defined
> > > as of v5.7-rc1), but traditionally it was more like a 'select if all
> > > dependencies are met'.
> >
> > That's still what it is supposed to mean right now ;-)
> > Except that now it should correctly handle the modular case, too.
>
> Then there is a bug. If I run 'make menuconfig' now on a mainline kernel
> and enable CONFIG_DRM_RCAR_DU, I can set
> DRM_RCAR_CMM and DRM_RCAR_LVDS to 'y', 'n' or 'm' regardless
> of whether CONFIG_DRM_RCAR_DU is 'm' or 'y'. The 'implies'
> statement seems to be ignored entirely, except as reverse 'default'
> setting.
Here is another version that should do what we want and is only
half-ugly. I can send that as a proper patch if it passes my testing
and nobody hates it too much.
Arnd
diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
index 0919f1f159a4..d2fcec807dfa 100644
--- a/drivers/gpu/drm/rcar-du/Kconfig
+++ b/drivers/gpu/drm/rcar-du/Kconfig
@@ -4,8 +4,6 @@ config DRM_RCAR_DU
depends on DRM && OF
depends on ARM || ARM64
depends on ARCH_RENESAS || COMPILE_TEST
- imply DRM_RCAR_CMM
- imply DRM_RCAR_LVDS
select DRM_KMS_HELPER
select DRM_KMS_CMA_HELPER
select DRM_GEM_CMA_HELPER
@@ -14,13 +12,17 @@ config DRM_RCAR_DU
Choose this option if you have an R-Car chipset.
If M is selected the module will be called rcar-du-drm.
-config DRM_RCAR_CMM
- tristate "R-Car DU Color Management Module (CMM) Support"
- depends on DRM && OF
+config DRM_RCAR_USE_CMM
+ bool "R-Car DU Color Management Module (CMM) Support"
depends on DRM_RCAR_DU
+ default DRM_RCAR_DU
help
Enable support for R-Car Color Management Module (CMM).
+config DRM_RCAR_CMM
+ def_tristate DRM_RCAR_DU
+ depends on DRM_RCAR_USE_CMM
+
config DRM_RCAR_DW_HDMI
tristate "R-Car DU Gen3 HDMI Encoder Support"
depends on DRM && OF
@@ -28,15 +30,20 @@ config DRM_RCAR_DW_HDMI
help
Enable support for R-Car Gen3 internal HDMI encoder.
-config DRM_RCAR_LVDS
- tristate "R-Car DU LVDS Encoder Support"
- depends on DRM && DRM_BRIDGE && OF
+config DRM_RCAR_USE_LVDS
+ bool "R-Car DU LVDS Encoder Support"
+ depends on DRM_BRIDGE && OF
+ default DRM_RCAR_DU
select DRM_PANEL
select OF_FLATTREE
select OF_OVERLAY
help
Enable support for the R-Car Display Unit embedded LVDS encoders.
+config DRM_RCAR_LVDS
+ def_tristate DRM_RCAR_DU
+ depends on DRM_RCAR_USE_LVDS
+
config DRM_RCAR_VSP
bool "R-Car DU VSP Compositor Support" if ARM
default y if ARM64
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