drm/gma500: Run DRM default client setup

Rework fbdev probing to support fbdev_probe in struct drm_driver
and remove the old fb_probe callback. Provide an initializer macro
for struct drm_driver that sets the callback according to the kernel
configuration.

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.

v5:
- select DRM_CLIENT_SELECTION

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-76-tzimmermann@suse.de

Author: tdz

drivers/gpu/drm/gma500/Kconfig

@@ -2,6 +2,7 @@
 config DRM_GMA500
 	tristate "Intel GMA500/600/3600/3650 KMS Framebuffer"
 	depends on DRM && PCI && X86 && MMU
+	select DRM_CLIENT_SELECTION
 	select DRM_KMS_HELPER
 	select FB_IOMEM_HELPERS if DRM_FBDEV_EMULATION
 	select I2C

drivers/gpu/drm/gma500/fbdev.c

@@ -143,12 +143,15 @@ static const struct fb_ops psb_fbdev_fb_ops = {
 	.fb_destroy = psb_fbdev_fb_destroy,
 };
 
+static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
+};
+
 /*
- * struct drm_fb_helper_funcs
+ * struct drm_driver
  */
 
-static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
-			      struct drm_fb_helper_surface_size *sizes)
+int psb_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
+				 struct drm_fb_helper_surface_size *sizes)
 {
 	struct drm_device *dev = fb_helper->dev;
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
@@ -206,6 +209,7 @@ static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
 		goto err_drm_gem_object_put;
 	}
 
+	fb_helper->funcs = &psb_fbdev_fb_helper_funcs;
 	fb_helper->fb = fb;
 
 	info = drm_fb_helper_alloc_info(fb_helper);
@@ -246,93 +250,3 @@ static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
 	drm_gem_object_put(obj);
 	return ret;
 }
-
-static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
-	.fb_probe = psb_fbdev_fb_probe,
-};
-
-/*
- * struct drm_client_funcs and setup code
- */
-
-static void psb_fbdev_client_unregister(struct drm_client_dev *client)
-{
-	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
-
-	if (fb_helper->info) {
-		drm_fb_helper_unregister_info(fb_helper);
-	} else {
-		drm_fb_helper_unprepare(fb_helper);
-		drm_client_release(&fb_helper->client);
-		kfree(fb_helper);
-	}
-}
-
-static int psb_fbdev_client_restore(struct drm_client_dev *client)
-{
-	drm_fb_helper_lastclose(client->dev);
-
-	return 0;
-}
-
-static int psb_fbdev_client_hotplug(struct drm_client_dev *client)
-{
-	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
-	struct drm_device *dev = client->dev;
-	int ret;
-
-	if (dev->fb_helper)
-		return drm_fb_helper_hotplug_event(dev->fb_helper);
-
-	ret = drm_fb_helper_init(dev, fb_helper);
-	if (ret)
-		goto err_drm_err;
-
-	if (!drm_drv_uses_atomic_modeset(dev))
-		drm_helper_disable_unused_functions(dev);
-
-	ret = drm_fb_helper_initial_config(fb_helper);
-	if (ret)
-		goto err_drm_fb_helper_fini;
-
-	return 0;
-
-err_drm_fb_helper_fini:
-	drm_fb_helper_fini(fb_helper);
-err_drm_err:
-	drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);
-	return ret;
-}
-
-static const struct drm_client_funcs psb_fbdev_client_funcs = {
-	.owner		= THIS_MODULE,
-	.unregister	= psb_fbdev_client_unregister,
-	.restore	= psb_fbdev_client_restore,
-	.hotplug	= psb_fbdev_client_hotplug,
-};
-
-void psb_fbdev_setup(struct drm_psb_private *dev_priv)
-{
-	struct drm_device *dev = &dev_priv->dev;
-	struct drm_fb_helper *fb_helper;
-	int ret;
-
-	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
-	if (!fb_helper)
-		return;
-	drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fbdev_fb_helper_funcs);
-
-	ret = drm_client_init(dev, &fb_helper->client, "fbdev-gma500", &psb_fbdev_client_funcs);
-	if (ret) {
-		drm_err(dev, "Failed to register client: %d\n", ret);
-		goto err_drm_fb_helper_unprepare;
-	}
-
-	drm_client_register(&fb_helper->client);
-
-	return;
-
-err_drm_fb_helper_unprepare:
-	drm_fb_helper_unprepare(fb_helper);
-	kfree(fb_helper);
-}

drivers/gpu/drm/gma500/psb_drv.c

@@ -20,6 +20,7 @@
 #include <acpi/video.h>
 
 #include <drm/drm.h>
+#include <drm/drm_client_setup.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.h>
 #include <drm/drm_ioctl.h>
@@ -475,7 +476,7 @@ static int psb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret)
 		return ret;
 
-	psb_fbdev_setup(dev_priv);
+	drm_client_setup(dev, NULL);
 
 	return 0;
 }
@@ -506,6 +507,7 @@ static const struct drm_driver driver = {
 	.num_ioctls = ARRAY_SIZE(psb_ioctls),
 
 	.dumb_create = psb_gem_dumb_create,
+	PSB_FBDEV_DRIVER_OPS,
 	.ioctls = psb_ioctls,
 	.fops = &psb_gem_fops,
 	.name = DRIVER_NAME,

drivers/gpu/drm/gma500/psb_drv.h

@@ -184,6 +184,9 @@
 #define KSEL_BYPASS_25 6
 #define KSEL_BYPASS_83_100 7
 
+struct drm_fb_helper;
+struct drm_fb_helper_surface_size;
+
 struct opregion_header;
 struct opregion_acpi;
 struct opregion_swsci;
@@ -597,10 +600,13 @@ struct drm_framebuffer *psb_framebuffer_create(struct drm_device *dev,
 
 /* fbdev */
 #if defined(CONFIG_DRM_FBDEV_EMULATION)
-void psb_fbdev_setup(struct drm_psb_private *dev_priv);
+int psb_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
+				 struct drm_fb_helper_surface_size *sizes);
+#define PSB_FBDEV_DRIVER_OPS \
+	.fbdev_probe = psb_fbdev_driver_fbdev_probe
 #else
-static inline void psb_fbdev_setup(struct drm_psb_private *dev_priv)
-{ }
+#define PSB_FBDEV_DRIVER_OPS \
+	.fbdev_probe = NULL
 #endif
 
 /* backlight.c */