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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: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Philipp Zabel 2014-12-11 18:32:44 +01:00 committed by Thierry Reding
parent 725c9d40f3
commit 2938931f37
1 changed files with 5 additions and 0 deletions
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5
include/drm/drm_panel.h
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@ -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 {