[PATCH 5.15 808/917] drm: fb_helper: improve CONFIG_FB dependency

Greg Kroah-Hartman
2021-11-16T00:01:20Z

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 9d6366e743f37d36ef69347924ead7bcc596076e ]

My previous patch correctly addressed the possible link failure, but as
Jani points out, the dependency is now stricter than it needs to be.

Change it again, to allow DRM_FBDEV_EMULATION to be used when
DRM_KMS_HELPER and FB are both loadable modules and DRM is linked into
the kernel.

As a side-effect, the option is now only visible when at least one DRM
driver makes use of DRM_KMS_HELPER. This is better, because the option
has no effect otherwise.

Fixes: 606b102876e3 ("drm: fb_helper: fix CONFIG_FB dependency")
Suggested-by: Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20211029120307.1407047-1-arnd@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/Kconfig | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 9199f53861cac..6ae4269118af3 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -102,9 +102,8 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS

config DRM_FBDEV_EMULATION
bool "Enable legacy fbdev support for your modesetting driver"
- depends on DRM
- depends on FB=y || FB=DRM
- select DRM_KMS_HELPER
+ depends on DRM_KMS_HELPER
+ depends on FB=y || FB=DRM_KMS_HELPER
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
--
2.33.0