Many panel data sheets additionally to typical values list allowed ranges for timings such as hsync/vsync lengths, porches, and the pixel clock rate. These can be stored in a struct display_timing, to be used by an encoder mode_fixup callback to clamp user provided timing values or to validate workarounds for clock source limitations.
This patch adds a new drm_panel_funcs callback that returns the panels' available display_timing entries.
Signed-off-by: Philipp Zabel p.zabel@pengutronix.de --- include/drm/drm_panel.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index 1fbcc96..13ff44b 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -29,6 +29,7 @@ struct drm_connector; struct drm_device; struct drm_panel; +struct display_timing;
/** * struct drm_panel_funcs - perform operations on a given panel @@ -38,6 +39,8 @@ struct drm_panel; * @enable: enable panel (turn on back light, etc.) * @get_modes: add modes to the connector that the panel is attached to and * return the number of modes added + * @get_timings: copy display timings into the provided array and return + * the number of display timings available * * The .prepare() function is typically called before the display controller * starts to transmit video data. Panel drivers can use this to turn the panel @@ -68,6 +71,8 @@ struct drm_panel_funcs { int (*prepare)(struct drm_panel *panel); int (*enable)(struct drm_panel *panel); int (*get_modes)(struct drm_panel *panel); + int (*get_timings)(struct drm_panel *panel, unsigned int num_timings, + struct display_timing *timings); };
struct drm_panel {