drm/doc: Document adjusted/request modes a bit better

Laurent started a massive discussion on IRC about this. Let's try to
document common usage a bit better.

v2: Cross-links+typos.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170515091136.26307-1-daniel.vetter@ffwll.ch

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index f703baf..983054f 100644 (file)
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -100,7 +100,7 @@ struct drm_bridge_funcs {
         * the display chain, either the final &drm_connector or the next
         * &drm_bridge. The parameter adjusted_mode is the input mode the bridge
         * requires. It can be modified by this callback and does not need to
-        * match mode.
+        * match mode. See also &drm_crtc_state.adjusted_mode for more details.
         *
         * This is the only hook that allows a bridge to reject a modeset. If
         * this function passes all other callbacks must succeed for this

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index adf4e91..b6e3713 100644 (file)
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -90,8 +90,6 @@ struct drm_plane_helper_funcs;
  * @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
  * @connector_mask: bitmask of (1 << drm_connector_index(connector)) of attached connectors
  * @encoder_mask: bitmask of (1 << drm_encoder_index(encoder)) of attached encoders
- * @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings
- * @mode: current mode timings
  * @mode_blob: &drm_property_blob for @mode
  * @state: backpointer to global drm_atomic_state
  *
@@ -131,9 +129,33 @@ struct drm_crtc_state {
        u32 connector_mask;
        u32 encoder_mask;
 
-       /* adjusted_mode: for use by helpers and drivers */
+       /**
+        * @adjusted_mode:
+        *
+        * Internal display timings which can be used by the driver to handle
+        * differences between the mode requested by userspace in @mode and what
+        * is actually programmed into the hardware. It is purely driver
+        * implementation defined what exactly this adjusted mode means. Usually
+        * it is used to store the hardware display timings used between the
+        * CRTC and encoder blocks.
+        */
        struct drm_display_mode adjusted_mode;
 
+       /**
+        * @mode:
+        *
+        * Display timings requested by userspace. The driver should try to
+        * match the refresh rate as close as possible (but note that it's
+        * undefined what exactly is close enough, e.g. some of the HDMI modes
+        * only differ in less than 1% of the refresh rate). The active width
+        * and height as observed by userspace for positioning planes must match
+        * exactly.
+        *
+        * For external connectors where the sink isn't fixed (like with a
+        * built-in panel), this mode here should match the physical mode on the
+        * wire to the last details (i.e. including sync polarities and
+        * everything).
+        */
        struct drm_display_mode mode;
 
        /* blob property to expose current mode to atomic userspace */

diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
index 739b832..361240c 100644 (file)
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -147,7 +147,8 @@ struct drm_crtc_helper_funcs {
         * encoders need to be fed with. Note that this is the inverse semantics
         * of the meaning for the &drm_encoder and &drm_bridge_funcs.mode_fixup
         * vfunc. If the CRTC cannot support the requested conversion from mode
-        * to adjusted_mode it should reject the modeset.
+        * to adjusted_mode it should reject the modeset. See also
+        * &drm_crtc_state.adjusted_mode for more details.
         *
         * This function is used by both legacy CRTC helpers and atomic helpers.
         * With atomic helpers it is optional.
@@ -528,7 +529,8 @@ struct drm_encoder_helper_funcs {
         * mode is the display mode that should be fed to the next element in
         * the display chain, either the final &drm_connector or a &drm_bridge.
         * The parameter adjusted_mode is the input mode the encoder requires. It
-        * can be modified by this callback and does not need to match mode.
+        * can be modified by this callback and does not need to match mode. See
+        * also &drm_crtc_state.adjusted_mode for more details.
         *
         * This function is used by both legacy CRTC helpers and atomic helpers.
         * This hook is optional.