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author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-08-12 22:48:48 +0200 |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-08-16 17:11:19 +0200 |
commit | 750fb8c439bcaa2752d717503119f66032a22b76 (patch) | |
tree | 233dfaafde8eef75bf1d26b2c783747ca55b65c7 /Documentation/gpu | |
parent | drm: Extract drm_framebuffer.[hc] (diff) | |
download | linux-750fb8c439bcaa2752d717503119f66032a22b76.tar.xz linux-750fb8c439bcaa2752d717503119f66032a22b76.zip |
drm/doc: Update drm_framebuffer docs
- Move the intro section into a DOC comment, and update it slightly.
- kernel-doc for struct drm_framebuffer!
v2:
- Copypaste fail (Sean).
- Explain the linear @offsets clearer (Ville).
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1471034937-651-12-git-send-email-daniel.vetter@ffwll.ch
Diffstat (limited to 'Documentation/gpu')
-rw-r--r-- | Documentation/gpu/drm-kms.rst | 26 |
1 files changed, 2 insertions, 24 deletions
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 8264a88a8695..d244e03658cc 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -39,30 +39,8 @@ Atomic Mode Setting Function Reference Frame Buffer Abstraction ======================== -Frame buffers are abstract memory objects that provide a source of -pixels to scanout to a CRTC. Applications explicitly request the -creation of frame buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls -and receive an opaque handle that can be passed to the KMS CRTC control, -plane configuration and page flip functions. - -Frame buffers rely on the underneath memory manager for low-level memory -operations. When creating a frame buffer applications pass a memory -handle (or a list of memory handles for multi-planar formats) through -the ``drm_mode_fb_cmd2`` argument. For drivers using GEM as their -userspace buffer management interface this would be a GEM handle. -Drivers are however free to use their own backing storage object -handles, e.g. vmwgfx directly exposes special TTM handles to userspace -and so expects TTM handles in the create ioctl and not GEM handles. - -The lifetime of a drm framebuffer is controlled with a reference count, -drivers can grab additional references with -:c:func:`drm_framebuffer_reference()`and drop them again with -:c:func:`drm_framebuffer_unreference()`. For driver-private -framebuffers for which the last reference is never dropped (e.g. for the -fbdev framebuffer when the struct :c:type:`struct drm_framebuffer -<drm_framebuffer>` is embedded into the fbdev helper struct) -drivers can manually clean up a framebuffer at module unload time with -:c:func:`drm_framebuffer_unregister_private()`. +.. kernel-doc:: drivers/gpu/drm/drm_framebuffer.c + :doc: overview Frame Buffer Functions Reference -------------------------------- |