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| author | Philippe Cornu <philippe.cornu@st.com> | 2018-04-09 18:24:27 +0300 |
|---|---|---|
| committer | Philippe Cornu <philippe.cornu@st.com> | 2018-05-15 18:34:38 +0300 |
| commit | 584a0146ec4989f30d0aef46ce1ea6f6ba22a690 (patch) | |
| tree | a48257daa48e881a21ee70fd659e96be6a76ab2f /include/drm/drm_bridge.h | |
| parent | aefff4915632185e286c8c94f6f5ccb939fc51d7 (diff) | |
| download | linux-584a0146ec4989f30d0aef46ce1ea6f6ba22a690.tar.xz | |
drm: clarify adjusted_mode documentation for bridges
This patch clarifies the adjusted_mode documentation
for bridges.
Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180409152427.12449-1-philippe.cornu@st.com
Diffstat (limited to 'include/drm/drm_bridge.h')
| -rw-r--r-- | include/drm/drm_bridge.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 3270fec46979..9917651a7fdd 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -178,6 +178,22 @@ struct drm_bridge_funcs { * then this would be &drm_encoder_helper_funcs.mode_set. The display * pipe (i.e. clocks and timing signals) is off when this function is * called. + * + * The adjusted_mode parameter is the mode output by the CRTC for the + * first bridge in the chain. It can be different from the mode + * parameter that contains the desired mode for the connector at the end + * of the bridges chain, for instance when the first bridge in the chain + * performs scaling. The adjusted mode is mostly useful for the first + * bridge in the chain and is likely irrelevant for the other bridges. + * + * For atomic drivers the adjusted_mode is the mode stored in + * &drm_crtc_state.adjusted_mode. + * + * NOTE: + * + * If a need arises to store and access modes adjusted for other + * locations than the connection between the CRTC and the first bridge, + * the DRM framework will have to be extended with DRM bridge states. */ void (*mode_set)(struct drm_bridge *bridge, struct drm_display_mode *mode, |