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| author | Leandro Ribeiro <leandro.ribeiro@collabora.com> | 2021-06-10 02:00:38 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-06-10 20:14:47 +0300 |
| commit | 26594678d00f94c62f2e43162bd6d10fd0b74917 (patch) | |
| tree | 15cfd9e705f60f75ba4e2cec3f5986dd4e5da385 /Documentation/gpu | |
| parent | 86441fa29e57940eeb00f35fefb1853c1fbe67bb (diff) | |
| download | linux-26594678d00f94c62f2e43162bd6d10fd0b74917.tar.xz | |
drm/doc: document how userspace should find out CRTC index
In this patch we add a section to document what userspace should do to
find out the CRTC index. This is important as they may be many places in
the documentation that need this, so it's better to just point to this
section and avoid repetition.
Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210609230039.73307-2-leandro.ribeiro@collabora.com
Diffstat (limited to 'Documentation/gpu')
| -rw-r--r-- | Documentation/gpu/drm-uapi.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst index 04bdc7a91d53..7e51dd40bf6e 100644 --- a/Documentation/gpu/drm-uapi.rst +++ b/Documentation/gpu/drm-uapi.rst @@ -457,6 +457,19 @@ Userspace API Structures .. kernel-doc:: include/uapi/drm/drm_mode.h :doc: overview +.. _crtc_index: + +CRTC index +---------- + +CRTC's have both an object ID and an index, and they are not the same thing. +The index is used in cases where a densely packed identifier for a CRTC is +needed, for instance a bitmask of CRTC's. The member possible_crtcs of struct +drm_mode_get_plane is an example. + +DRM_IOCTL_MODE_GETRESOURCES populates a structure with an array of CRTC ID's, +and the CRTC index is its position in this array. + .. kernel-doc:: include/uapi/drm/drm.h :internal: |