[PATCH v2 3/3] drm: simpledrm: honour remove_conflicting_framebuffers()

[Noralf Trønnes]

There is currently no non-fbdev mechanism in place to kick out
simpledrm when the real hw-driver is probed. As a stop gap until
that is in place, honour remove_conflicting_framebuffers() and
delete the simple-framebuffer platform device when it's called.

Signed-off-by: Noralf Trønnes <noralf at tronnes.org>
---
 drivers/gpu/drm/simpledrm/Kconfig           |  5 ++++
 drivers/gpu/drm/simpledrm/Makefile          |  2 +-
 drivers/gpu/drm/simpledrm/simpledrm.h       |  9 +++++++
 drivers/gpu/drm/simpledrm/simpledrm_drv.c   |  3 +++
 drivers/gpu/drm/simpledrm/simpledrm_fbdev.c | 40 +++++++++++++++++++++++++++++
 5 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/simpledrm/Kconfig b/drivers/gpu/drm/simpledrm/Kconfig
index 9454536..6205b17 100644
--- a/drivers/gpu/drm/simpledrm/Kconfig
+++ b/drivers/gpu/drm/simpledrm/Kconfig
@@ -16,6 +16,11 @@ config DRM_SIMPLEDRM
 	  If fbdev support is enabled, this driver will also provide an fbdev
 	  compatibility layer.
 
+	  WARNING
+	  fbdev must be enabled for simpledrm to disable itself when a real
+	  hw-driver is probed. It relies on remove_conflicting_framebuffers()
+	  to be called by the hw-driver.
+
 	  If unsure, say Y.
 
 	  To compile this driver as a module, choose M here: the
diff --git a/drivers/gpu/drm/simpledrm/Makefile b/drivers/gpu/drm/simpledrm/Makefile
index 7087245..4b4bcdd 100644
--- a/drivers/gpu/drm/simpledrm/Makefile
+++ b/drivers/gpu/drm/simpledrm/Makefile
@@ -1,5 +1,5 @@
 simpledrm-y :=	simpledrm_drv.o simpledrm_kms.o simpledrm_gem.o \
 		simpledrm_damage.o
-simpledrm-$(CONFIG_DRM_FBDEV_EMULATION) += simpledrm_fbdev.o
+simpledrm-$(CONFIG_FB) += simpledrm_fbdev.o
 
 obj-$(CONFIG_DRM_SIMPLEDRM) := simpledrm.o
diff --git a/drivers/gpu/drm/simpledrm/simpledrm.h b/drivers/gpu/drm/simpledrm/simpledrm.h
index eb18d59..16f7e03 100644
--- a/drivers/gpu/drm/simpledrm/simpledrm.h
+++ b/drivers/gpu/drm/simpledrm/simpledrm.h
@@ -100,6 +100,8 @@ struct sdrm_framebuffer {
 void sdrm_fbdev_init(struct sdrm_device *sdrm);
 void sdrm_fbdev_cleanup(struct sdrm_device *sdrm);
 void sdrm_fbdev_set_suspend(struct sdrm_device *sdrm, int state);
+void sdrm_fbdev_kickout_init(void);
+void sdrm_fbdev_kickout_exit(void);
 
 #else
 
@@ -115,6 +117,13 @@ static inline void sdrm_fbdev_set_suspend(struct sdrm_device *sdrm, int state)
 {
 }
 
+static inline void sdrm_fbdev_kickout_init(void)
+{
+}
+
+static inline void sdrm_fbdev_kickout_exit(void)
+{
+}
 #endif
 
 #endif /* SDRM_DRV_H */
diff --git a/drivers/gpu/drm/simpledrm/simpledrm_drv.c b/drivers/gpu/drm/simpledrm/simpledrm_drv.c
index 88ad717c..a329e4c 100644
--- a/drivers/gpu/drm/simpledrm/simpledrm_drv.c
+++ b/drivers/gpu/drm/simpledrm/simpledrm_drv.c
@@ -526,12 +526,15 @@ static int __init sdrm_init(void)
 		}
 	}
 
+	sdrm_fbdev_kickout_init();
+
 	return 0;
 }
 module_init(sdrm_init);
 
 static void __exit sdrm_exit(void)
 {
+	sdrm_fbdev_kickout_exit();
 	platform_driver_unregister(&sdrm_simplefb_driver);
 }
 module_exit(sdrm_exit);
diff --git a/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
index b83646b..0d64352 100644
--- a/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
+++ b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
@@ -24,6 +24,7 @@
 #include "simpledrm.h"
 
 struct sdrm_fbdev {
+	struct sdrm_device *sdrm;
 	u32 palette[16];
 };
 
@@ -76,7 +77,16 @@ void sdrm_fbdev_init(struct sdrm_device *sdrm)
 	if (!info)
 		goto err_out;
 
+	info->apertures = alloc_apertures(1);
+	if (!info->apertures)
+		goto err_free;
+
+	info->apertures->ranges[0].base = sdrm->fb_base;
+	info->apertures->ranges[0].size = sdrm->fb_size;
+
 	fb = info->par;
+	fb->sdrm = sdrm;
+
 	info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE |
 		      FBINFO_CAN_FORCE_OUTPUT;
 	info->pseudo_palette = fb->palette;
@@ -158,3 +168,33 @@ void sdrm_fbdev_set_suspend(struct sdrm_device *sdrm, int state)
 	fb_set_suspend(sdrm->fbdev, state);
 	console_unlock();
 }
+
+static int sdrm_fbdev_event_notify(struct notifier_block *self,
+				   unsigned long action, void *data)
+{
+	struct fb_event *event = data;
+	struct fb_info *info = event->info;
+	struct sdrm_fbdev *sfb = info->par;
+
+	if (sfb && sfb->sdrm && sfb->sdrm->fbdev == info &&
+	    action == FB_EVENT_FB_UNREGISTERED) {
+		sfb->sdrm->fbdev = NULL; /* don't run sdrm_fbdev_cleanup() */
+		platform_device_del(sfb->sdrm->ddev->platformdev);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block sdrm_fbdev_event_notifier = {
+	.notifier_call  = sdrm_fbdev_event_notify,
+};
+
+void sdrm_fbdev_kickout_init(void)
+{
+	fb_register_client(&sdrm_fbdev_event_notifier);
+}
+
+void sdrm_fbdev_kickout_exit(void)
+{
+	fb_unregister_client(&sdrm_fbdev_event_notifier);
+}
-- 
2.8.2