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Message-Id: <1471897525-31118-6-git-send-email-noralf@tronnes.org>
Date: Mon, 22 Aug 2016 22:25:25 +0200
From: Noralf Trønnes <noralf@...nnes.org>
To: dri-devel@...ts.freedesktop.org
Cc: robh@...nel.org, devicetree@...r.kernel.org, dh.herrmann@...il.com,
linux-kernel@...r.kernel.org,
Noralf Trønnes <noralf@...nnes.org>
Subject: [PATCH v4 5/5] drm: simpledrm: honour remove_conflicting_framebuffers()
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@...nnes.org>
---
Changes from version 3:
- drm_device.platformdev is deprecated, use to_platform_device(ddev->dev).
- fb_helper might have been released in sdrm_fbdev_fb_destroy(),
so open code drm_fb_helper_release_fbi()
- Strengthen the test in sdrm_fbdev_event_notify() that we're the one.
Changes from version 2:
- Don't forget to free fb_info when kicked out.
drivers/gpu/drm/simpledrm/Kconfig | 5 +++
drivers/gpu/drm/simpledrm/simpledrm.h | 2 +
drivers/gpu/drm/simpledrm/simpledrm_drv.c | 3 ++
drivers/gpu/drm/simpledrm/simpledrm_fbdev.c | 62 ++++++++++++++++++++++++++++-
4 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/simpledrm/Kconfig b/drivers/gpu/drm/simpledrm/Kconfig
index 3257590..4275d13 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 that supports fbcon, mmap is not supported.
+ 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/simpledrm.h b/drivers/gpu/drm/simpledrm/simpledrm.h
index d4eb52c..3cca196 100644
--- a/drivers/gpu/drm/simpledrm/simpledrm.h
+++ b/drivers/gpu/drm/simpledrm/simpledrm.h
@@ -87,5 +87,7 @@ int sdrm_fb_init(struct drm_device *ddev, struct sdrm_framebuffer *fb,
struct sdrm_gem_object *obj);
void sdrm_fbdev_init(struct sdrm_device *sdrm);
void sdrm_fbdev_cleanup(struct sdrm_device *sdrm);
+void sdrm_fbdev_kickout_init(void);
+void sdrm_fbdev_kickout_exit(void);
#endif /* SDRM_DRV_H */
diff --git a/drivers/gpu/drm/simpledrm/simpledrm_drv.c b/drivers/gpu/drm/simpledrm/simpledrm_drv.c
index fe752c6..0750652 100644
--- a/drivers/gpu/drm/simpledrm/simpledrm_drv.c
+++ b/drivers/gpu/drm/simpledrm/simpledrm_drv.c
@@ -531,12 +531,15 @@ 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 c6596ad..7c6db2c 100644
--- a/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
+++ b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
@@ -44,6 +44,20 @@ static int sdrm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
return -ENODEV;
}
+/*
+ * Releasing has to be done outside the notifier callchain when we're
+ * kicked out, since do_unregister_framebuffer() calls put_fb_info()
+ * after the notifier has run.
+ * Open code drm_fb_helper_release_fbi() since fb_helper is freed at
+ * this point when kicked out.
+ */
+static void sdrm_fbdev_fb_destroy(struct fb_info *info)
+{
+ if (info->cmap.len)
+ fb_dealloc_cmap(&info->cmap);
+ framebuffer_release(info);
+}
+
static struct fb_ops sdrm_fbdev_ops = {
.owner = THIS_MODULE,
.fb_fillrect = drm_fb_helper_sys_fillrect,
@@ -53,6 +67,7 @@ static struct fb_ops sdrm_fbdev_ops = {
.fb_set_par = drm_fb_helper_set_par,
.fb_setcmap = drm_fb_helper_setcmap,
.fb_mmap = sdrm_fb_mmap,
+ .fb_destroy = sdrm_fbdev_fb_destroy,
};
static int sdrm_fbdev_create(struct drm_fb_helper *helper,
@@ -110,6 +125,9 @@ static int sdrm_fbdev_create(struct drm_fb_helper *helper,
fbi->screen_base = obj->vmapping;
fbi->fix.smem_len = sdrm->fb_size;
+ fbi->apertures->ranges[0].base = sdrm->fb_base;
+ fbi->apertures->ranges[0].size = sdrm->fb_size;
+
return 0;
err_fbi_release:
@@ -188,9 +206,13 @@ void sdrm_fbdev_cleanup(struct sdrm_device *sdrm)
sdrm->fb_helper = NULL;
fbdev = to_sdrm_fbdev(fb_helper);
- drm_fb_helper_unregister_fbi(fb_helper);
+ /* it might have been kicked out */
+ if (registered_fb[fbdev->fb_helper.fbdev->node])
+ drm_fb_helper_unregister_fbi(fb_helper);
+
+ /* freeing fb_info is done in fb_ops.fb_destroy() */
+
cancel_work_sync(&fb_helper->dirty_work);
- drm_fb_helper_release_fbi(fb_helper);
drm_framebuffer_unregister_private(fb_helper->fb);
drm_framebuffer_cleanup(fb_helper->fb);
@@ -199,3 +221,39 @@ void sdrm_fbdev_cleanup(struct sdrm_device *sdrm)
drm_fb_helper_fini(fb_helper);
kfree(fbdev);
}
+
+static int sdrm_fbdev_event_notify(struct notifier_block *self,
+ unsigned long action, void *data)
+{
+ struct sdrm_device *sdrm;
+ struct fb_event *event = data;
+ struct fb_info *info = event->info;
+ struct drm_fb_helper *fb_helper = info->par;
+
+ if (action != FB_EVENT_FB_UNREGISTERED)
+ return NOTIFY_DONE;
+
+ if (!fb_helper || !fb_helper->dev || fb_helper->fbdev != info)
+ return NOTIFY_DONE;
+
+ sdrm = fb_helper->dev->dev_private;
+
+ if (sdrm && sdrm->fb_helper == fb_helper)
+ platform_device_del(to_platform_device(fb_helper->dev->dev));
+
+ 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
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