diff options
Diffstat (limited to 'drivers/gpu/drm/drm_crtc_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc_helper.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index 46728a8ac622..33195e9adaab 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -41,6 +41,26 @@ #include <drm/drm_plane_helper.h> #include <drm/drm_edid.h> +/** + * DOC: overview + * + * The CRTC modeset helper library provides a default set_config implementation + * in drm_crtc_helper_set_config(). Plus a few other convenience functions using + * the same callbacks which drivers can use to e.g. restore the modeset + * configuration on resume with drm_helper_resume_force_mode(). + * + * The driver callbacks are mostly compatible with the atomic modeset helpers, + * except for the handling of the primary plane: Atomic helpers require that the + * primary plane is implemented as a real standalone plane and not directly tied + * to the CRTC state. For easier transition this library provides functions to + * implement the old semantics required by the CRTC helpers using the new plane + * and atomic helper callbacks. + * + * Drivers are strongly urged to convert to the atomic helpers (by way of first + * converting to the plane helpers). New drivers must not use these functions + * but need to implement the atomic interface instead, potentially using the + * atomic helpers for that. + */ MODULE_AUTHOR("David Airlie, Jesse Barnes"); MODULE_DESCRIPTION("DRM KMS helper"); MODULE_LICENSE("GPL and additional rights"); |