This is a note to let you know that I've just added the patch titled
drm: Don't make DRM_PANEL_BRIDGE dependent on DRM_KMS_HELPERS
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-don-t-make-drm_panel_bridge-dependent-on-drm_kms.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bcdfc429b10c82e994d1aba0e3c366fb06a1fce6
Author: Thomas Zimmermann <tzimmermann@xxxxxxx>
Date: Tue Mar 15 09:45:59 2022 +0100
drm: Don't make DRM_PANEL_BRIDGE dependent on DRM_KMS_HELPERS
[ Upstream commit 3c3384050d68570f9de0fec9e58824decfefba7a ]
Fix a number of undefined references to drm_kms_helper.ko in
drm_dp_helper.ko:
arm-suse-linux-gnueabi-ld: drivers/gpu/drm/dp/drm_dp_mst_topology.o: in function `drm_dp_mst_duplicate_state':
drm_dp_mst_topology.c:(.text+0x2df0): undefined reference to `__drm_atomic_helper_private_obj_duplicate_state'
arm-suse-linux-gnueabi-ld: drivers/gpu/drm/dp/drm_dp_mst_topology.o: in function `drm_dp_delayed_destroy_work':
drm_dp_mst_topology.c:(.text+0x370c): undefined reference to `drm_kms_helper_hotplug_event'
arm-suse-linux-gnueabi-ld: drivers/gpu/drm/dp/drm_dp_mst_topology.o: in function `drm_dp_mst_up_req_work':
drm_dp_mst_topology.c:(.text+0x7938): undefined reference to `drm_kms_helper_hotplug_event'
arm-suse-linux-gnueabi-ld: drivers/gpu/drm/dp/drm_dp_mst_topology.o: in function `drm_dp_mst_link_probe_work':
drm_dp_mst_topology.c:(.text+0x82e0): undefined reference to `drm_kms_helper_hotplug_event'
This happens if panel-edp.ko has been configured with
DRM_PANEL_EDP=y
DRM_DP_HELPER=y
DRM_KMS_HELPER=m
which builds DP helpers into the kernel and KMS helpers sa a module.
Making DRM_PANEL_EDP select DRM_KMS_HELPER resolves this problem.
To avoid a resulting cyclic dependency with DRM_PANEL_BRIDGE, don't
make the latter depend on DRM_KMS_HELPER and fix the one DRM bridge
drivers that doesn't already select DRM_KMS_HELPER. As KMS helpers
cannot be selected directly by the user, config symbols should avoid
depending on it anyway.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Fixes: 3755d35ee1d2 ("drm/panel: Select DRM_DP_HELPER for DRM_PANEL_EDP")
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Tested-by: Brian Masney <bmasney@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
Cc: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/478296/
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 431b6e12a81f..68ec45abc1fb 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -8,7 +8,6 @@ config DRM_BRIDGE
config DRM_PANEL_BRIDGE
def_bool y
depends on DRM_BRIDGE
- depends on DRM_KMS_HELPER
select DRM_PANEL
help
DRM bridge wrapper of DRM panels
@@ -30,6 +29,7 @@ config DRM_CDNS_DSI
config DRM_CHIPONE_ICN6211
tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge"
depends on OF
+ select DRM_KMS_HELPER
select DRM_MIPI_DSI
select DRM_PANEL_BRIDGE
help
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 0d3798354e6a..42011d884202 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -96,6 +96,7 @@ config DRM_PANEL_EDP
select VIDEOMODE_HELPERS
select DRM_DP_AUX_BUS
select DRM_DP_HELPER
+ select DRM_KMS_HELPER
help
DRM panel driver for dumb eDP panels that need at most a regulator and
a GPIO to be powered up. Optionally a backlight can be attached so
