[PATCH v2 10/11] drm/client: Make client support optional

[Thomas Zimmermann]

Only build client code if DRM_CLIENT has been selected. Automatially
do so if one of the default clients has been enabled. If client support
has been disabled, the helpers for client-related events are empty and
the regular client functions are not present.

Amdgpu has an internal DRM client, so it has to select DRM_CLIENT by
itself unconditionally.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: "Christian König" <christian.koenig at amd.com>
Cc: Xinhui Pan <Xinhui.Pan at amd.com>
---
 drivers/gpu/drm/Kconfig            | 10 ++++++++++
 drivers/gpu/drm/Makefile           |  7 ++++---
 drivers/gpu/drm/amd/amdgpu/Kconfig |  1 +
 include/drm/drm_client_event.h     | 13 +++++++++++++
 4 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 88b2ba55fe16..86e5b0194100 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -209,6 +209,15 @@ config DRM_DEBUG_MODESET_LOCK
 
 	  If in doubt, say "N".
 
+config DRM_CLIENT
+	bool
+	depends on DRM
+	help
+	  Enables support for DRM clients. DRM drivers that need
+	  struct drm_client_dev and its interfaces should select this
+	  option. Drivers that support the default clients should
+	  select DRM_CLIENT_SELECTION instead.
+
 config DRM_CLIENT_SELECTION
 	bool
 	depends on DRM
@@ -224,6 +233,7 @@ config DRM_CLIENT_SETUP
 config DRM_FBDEV_EMULATION
 	bool "Enable legacy fbdev support for your modesetting driver"
 	depends on DRM
+	select DRM_CLIENT
 	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
 	default FB
 	help
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 6b7d168ca790..c3e5d353588e 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -41,9 +41,6 @@ drm-y := \
 	drm_blend.o \
 	drm_bridge.o \
 	drm_cache.o \
-	drm_client.o \
-	drm_client_event.o \
-	drm_client_modeset.o \
 	drm_color_mgmt.o \
 	drm_connector.o \
 	drm_crtc.o \
@@ -77,6 +74,10 @@ drm-y := \
 	drm_vblank_work.o \
 	drm_vma_manager.o \
 	drm_writeback.o
+drm-$(CONFIG_DRM_CLIENT) += \
+	drm_client.o \
+	drm_client_event.o \
+	drm_client_modeset.o
 drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 drm-$(CONFIG_DRM_PANEL) += drm_panel.o
diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig
index 680a94c361ba..41fa3377d9cf 100644
--- a/drivers/gpu/drm/amd/amdgpu/Kconfig
+++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
@@ -5,6 +5,7 @@ config DRM_AMDGPU
 	depends on DRM && PCI && MMU
 	depends on !UML
 	select FW_LOADER
+	select DRM_CLIENT
 	select DRM_CLIENT_SELECTION
 	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_DSC_HELPER
diff --git a/include/drm/drm_client_event.h b/include/drm/drm_client_event.h
index 72c97d111169..99863554b055 100644
--- a/include/drm/drm_client_event.h
+++ b/include/drm/drm_client_event.h
@@ -5,10 +5,23 @@
 
 struct drm_device;
 
+#if defined(CONFIG_DRM_CLIENT)
 void drm_client_dev_unregister(struct drm_device *dev);
 void drm_client_dev_hotplug(struct drm_device *dev);
 void drm_client_dev_restore(struct drm_device *dev);
 void drm_client_dev_suspend(struct drm_device *dev, bool holds_console_lock);
 void drm_client_dev_resume(struct drm_device *dev, bool holds_console_lock);
+#else
+static inline void drm_client_dev_unregister(struct drm_device *dev)
+{ }
+static inline void drm_client_dev_hotplug(struct drm_device *dev)
+{ }
+static inline void drm_client_dev_restore(struct drm_device *dev)
+{ }
+static inline void drm_client_dev_suspend(struct drm_device *dev, bool holds_console_lock)
+{ }
+static inline void drm_client_dev_resume(struct drm_device *dev, bool holds_console_lock)
+{ }
+#endif
 
 #endif
-- 
2.46.0