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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-11-06 22:53:29 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-11-06 23:08:32 +0300 |
| commit | 3150c7d0c686ffee9e414ccce705c34ebcbf4e30 (patch) | |
| tree | 7158417e3756a9a04c766a82c0861b9d04d30e24 /drivers/gpu/drm/drm_plane_helper.c | |
| parent | d461701c551efe92893b31d05906d51e2f1f8244 (diff) | |
| download | linux-3150c7d0c686ffee9e414ccce705c34ebcbf4e30.tar.xz | |
drm: Docbook integration and over sections for all the new helpers
In all cases the text requires that new drivers are converted to the
atomic interfaces.
v2: Add overview for state handling.
v3: Review from Sean: Some spelling fixes and drop the misguided
hunk to remove rgba8888 from the plane helpers compat list.
Cc: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_plane_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_plane_helper.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index a5a295872fbb..fa56bb5da6c3 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -31,6 +31,32 @@ #define SUBPIXEL_MASK 0xffff +/** + * DOC: overview + * + * This helper library has two parts. The first part has support to implement + * primary plane support on top of the normal CRTC configuration interface. + * Since the legacy ->set_config interface ties the primary plane together with + * the CRTC state this does not allow userspace to disable the primary plane + * itself. To avoid too much duplicated code use + * drm_plane_helper_check_update() which can be used to enforce the same + * restrictions as primary planes had thus. The default primary plane only + * expose XRBG8888 and ARGB8888 as valid pixel formats for the attached + * framebuffer. + * + * Drivers are highly recommended to implement proper support for primary + * planes, and newly merged drivers must not rely upon these transitional + * helpers. + * + * The second part also implements transitional helpers which allow drivers to + * gradually switch to the atomic helper infrastructure for plane updates. Once + * that switch is complete drivers shouldn't use these any longer, instead using + * the proper legacy implementations for update and disable plane hooks provided + * by the atomic helpers. + * + * Again drivers are strongly urged to switch to the new interfaces. + */ + /* * This is the minimal list of formats that seem to be safe for modeset use * with all current DRM drivers. Most hardware can actually support more |