drm/mcde: Run DRM default client setup

Call drm_client_setup() to run the kernel's default client setup
for DRM. Set fbdev_probe in struct drm_driver, so that the client
setup can start the common fbdev client.

The mcde driver specifies a preferred color mode of 32. As this
is the default if no format has been given, leave it out entirely.

v5:
- select DRM_CLIENT_SELECTION

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-26-tzimmermann@suse.de

drivers/gpu/drm/mcde/Kconfig

@@ -6,6 +6,7 @@ config DRM_MCDE
 	depends on OF
 	depends on COMMON_CLK
 	select MFD_SYSCON
+	select DRM_CLIENT_SELECTION
 	select DRM_MIPI_DSI
 	select DRM_BRIDGE
 	select DRM_PANEL_BRIDGE

drivers/gpu/drm/mcde/mcde_drv.c

@@ -67,6 +67,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_client_setup.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fb_dma_helper.h>
 #include <drm/drm_fbdev_dma.h>
@@ -212,6 +213,7 @@ static const struct drm_driver mcde_drm_driver = {
 	.minor = 0,
 	.patchlevel = 0,
 	DRM_GEM_DMA_DRIVER_OPS,
+	DRM_FBDEV_DMA_DRIVER_OPS,
 };
 
 static int mcde_drm_bind(struct device *dev)
@@ -237,7 +239,7 @@ static int mcde_drm_bind(struct device *dev)
 	if (ret < 0)
 		goto unbind;
 
-	drm_fbdev_dma_setup(drm, 32);
+	drm_client_setup(drm, NULL);
 
 	return 0;