diff options
| author | Simon Ser <contact@emersion.fr> | 2020-05-21 14:09:31 +0300 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2020-06-01 17:13:20 +0300 |
| commit | e954f77f6330028ced7bac4ad22ea69ed64e5725 (patch) | |
| tree | 4db072905e9d9bb2e65cd622dcd03ad0eb6dd93b /drivers/gpu/drm/drm_crtc.c | |
| parent | 720815247395480ac0d04948fc9ab6282b3291b9 (diff) | |
| download | linux-e954f77f6330028ced7bac4ad22ea69ed64e5725.tar.xz | |
drm: add docs for standard CRTC properties
This patch adds docs for the ACTIVE and MODE_ID CRTC properties.
Signed-off-by: Simon Ser <contact@emersion.fr>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Cc: Michel Dänzer <michel@daenzer.net>
Cc: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/k52vYFBQ5ZO18TgZl3W8MgP6f4qu5Ncir7w-On8Dm0V2KTAcVkUoS7-IGPcvDJAXLsyJAUsD0QFJts3Dy0yWyHXVh85axrZkybh3MGGFhQc=@emersion.fr
Diffstat (limited to 'drivers/gpu/drm/drm_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 4936e1080e41..f1216088f65f 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -205,6 +205,33 @@ struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc) } /** + * DOC: standard CRTC properties + * + * DRM CRTCs have a few standardized properties: + * + * ACTIVE: + * Atomic property for setting the power state of the CRTC. When set to 1 + * the CRTC will actively display content. When set to 0 the CRTC will be + * powered off. There is no expectation that user-space will reset CRTC + * resources like the mode and planes when setting ACTIVE to 0. + * + * User-space can rely on an ACTIVE change to 1 to never fail an atomic + * test as long as no other property has changed. If a change to ACTIVE + * fails an atomic test, this is a driver bug. For this reason setting + * ACTIVE to 0 must not release internal resources (like reserved memory + * bandwidth or clock generators). + * + * Note that the legacy DPMS property on connectors is internally routed + * to control this property for atomic drivers. + * MODE_ID: + * Atomic property for setting the CRTC display timings. The value is the + * ID of a blob containing the DRM mode info. To disable the CRTC, + * user-space must set this property to 0. + * + * Setting MODE_ID to 0 will release reserved resources for the CRTC. + */ + +/** * drm_crtc_init_with_planes - Initialise a new CRTC object with * specified primary and cursor planes. * @dev: DRM device |