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Commit 2938931f authored by Philipp Zabel's avatar Philipp Zabel Committed by Thierry Reding
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drm/panel: Add display timing support 



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 panel's
available display_timing entries.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 725c9d40

include/drm/drm_panel.h

+5 −0
Original line number Diff line number Diff line
@@ -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 {