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    • Thomas Zimmermann's avatar
      drm/exynos: Implement fbdev emulation as in-kernel client · 49953b70
      Thomas Zimmermann authored
      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: default avatarThomas Zimmermann <tzimmermann@suse.de>
      Tested-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
      Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
      49953b70