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authorDaniel Vetter <daniel.vetter@ffwll.ch>2014-11-06 20:53:29 +0100
committerDaniel Vetter <daniel.vetter@ffwll.ch>2014-11-06 21:08:32 +0100
commit3150c7d0c686ffee9e414ccce705c34ebcbf4e30 (patch)
tree7158417e3756a9a04c766a82c0861b9d04d30e24 /drivers/gpu/drm/drm_crtc_helper.c
parentd461701c551efe92893b31d05906d51e2f1f8244 (diff)
downloadop-kernel-dev-3150c7d0c686ffee9e414ccce705c34ebcbf4e30.zip
op-kernel-dev-3150c7d0c686ffee9e414ccce705c34ebcbf4e30.tar.gz
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_crtc_helper.c')
-rw-r--r--drivers/gpu/drm/drm_crtc_helper.c20
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 46728a8..33195e9 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");
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