[PATCH v2 0/2] drm: Support framebuffer panning

[Maxime Ripard]

Hi,

This is a respin of the previous serie called "Support fast framebuffer
panning for i.MX6" made by Stefan 6 monthes ago. The imx6 bits have been
removed, and the comments that were made at that time fixed (hopefully).

Let me know what you think,
Maxime

Changes from v1:
  - Added drm_fb_helper_ioctl to DRM_FB_HELPER_DEFAULT_OPS
  - Expanded a bit the kerneldoc for drm_fb_helper_ioctl
  - Added some locking to drm_fb_helper_ioctl
  - Checked that the framebuffer is indeed attached before allowing ioctl
  - Added a module parameter to specify the number of framebuffers to
    allocate

Initial cover letter: Support fast framebuffer panning for i.MX6

im currently working on supporting double/tripple buffering for the
framebuffer emulation on the i.MX6.  While working on it I noticed that the
mainline kernel does not support some features in the generic drm
framebuffer emulation for framebuffer panning and vsync synchronisation.
They are needed for simple framebuffer applications and some OpenGL
libraries using double buffering with FBIOPUT_VSCREENINFO,
FBIO_WAITFORVSYNC and FBIOPAN_DISPLAY.

Stefan Christ (1):
  drm/fb_helper: implement ioctl FBIO_WAITFORVSYNC

Xinliang Liu (1):
  drm/cma-helper: Add multi buffer support for cma fbdev

 drivers/gpu/drm/Kconfig             |  8 ++++-
 drivers/gpu/drm/drm_fb_cma_helper.c |  8 +++-
 drivers/gpu/drm/drm_fb_helper.c     | 55 ++++++++++++++++++++++++++++++-
 include/drm/drm_fb_helper.h         |  5 ++-
 4 files changed, 74 insertions(+), 2 deletions(-)

base-commit: 8b394ae674998d4ade6cb48aec3fca5445908dfe
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git-series 0.8.11