drm/mxsfb: 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 mxsfb 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
v3:
- fix driver name "msxfb" to "mxsfb"

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-31-tzimmermann@suse.de

drivers/gpu/drm/mxsfb/Kconfig

@@ -9,6 +9,7 @@ config DRM_MXSFB
 	depends on DRM && OF
 	depends on COMMON_CLK
 	depends on ARCH_MXS || ARCH_MXC || COMPILE_TEST
+	select DRM_CLIENT_SELECTION
 	select DRM_MXS
 	select DRM_KMS_HELPER
 	select DRM_GEM_DMA_HELPER

drivers/gpu/drm/mxsfb/mxsfb_drv.c

@@ -19,6 +19,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_client_setup.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_dma.h>
@@ -331,6 +332,7 @@ DEFINE_DRM_GEM_DMA_FOPS(fops);
 static const struct drm_driver mxsfb_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 	DRM_GEM_DMA_DRIVER_OPS,
+	DRM_FBDEV_DMA_DRIVER_OPS,
 	.fops	= &fops,
 	.name	= "mxsfb-drm",
 	.desc	= "MXSFB Controller DRM",
@@ -364,7 +366,7 @@ static int mxsfb_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_unload;
 
-	drm_fbdev_dma_setup(drm, 32);
+	drm_client_setup(drm, NULL);
 
 	return 0;