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drm/exynos: Implement fbdev emulation as in-kernel client

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Move code from ad-hoc fbdev callbacks into DRM client functions
and remove the old callbacks. The functions instruct the client
to poll for changed output or restore the display. The DRM core
calls both, the old callbacks and the new client helpers, from
the same places. The new functions perform the same operation as
before, so there's no change in functionality.

Replace all code that initializes or releases fbdev emulation
throughout the driver. Instead initialize the fbdev client by a
single call to exynos_fbdev_setup() after exynos has registered its
DRM device. As in most drivers, exynos' fbdev emulation now acts
like a regular DRM client.

The fbdev client setup consists of the initial preparation and the
hot-plugging of the display. The latter creates the fbdev device
and sets up the fbdev framebuffer. The setup performs display
hot-plugging once. If no display can be detected, DRM probe helpers
re-run the detection on each hotplug event.

A call to drm_dev_unregister() releases the client automatically.
No further action is required within exynos. If the fbdev framebuffer
has been fully set up, struct fb_ops.fb_destroy implements the
release. For partially initialized emulation, the fbdev client
reverts the initial setup.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Thomas Zimmermann
2023-03-30 09:36:35 +02:00
committed by Inki Dae
parent 99286486d6
commit 49953b70e7
4 changed files with 80 additions and 111 deletions
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20
drivers/gpu/drm/exynos/exynos_drm_fbdev.h
View File

@@ -12,27 +12,11 @@
#define _EXYNOS_DRM_FBDEV_H_
#ifdef CONFIG_DRM_FBDEV_EMULATION
int exynos_drm_fbdev_init(struct drm_device *dev);
void exynos_drm_fbdev_fini(struct drm_device *dev);
void exynos_drm_fbdev_setup(struct drm_device *dev);
#else
static inline int exynos_drm_fbdev_init(struct drm_device *dev)
{
return 0;
}
static inline void exynos_drm_fbdev_fini(struct drm_device *dev)
static inline void exynos_drm_fbdev_setup(struct drm_device *dev)
{
}
static inline void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
{
}
#define exynos_drm_output_poll_changed (NULL)
#endif
#endif