forked from Minki/linux
8714c0cecf
Add display_timing structure and the according helper functions. This allows
the description of a display via its supported timing parameters.
Also, add helper functions to convert from display timings to a generic videomode
structure.
The struct display_timing specifies all needed parameters to describe the signal
properties of a display in one mode. This includes
- ranges for signals that may have min-, max- and typical values
- single integers for signals that can be on, off or are ignored
- booleans for signals that are either on or off
As a display may support multiple modes like this, a struct display_timings is
added, that holds all given struct display_timing pointers and declares the
native mode of the display.
Although a display may state that a signal can be in a range, it is driven with
fixed values that indicate a videomode. Therefore graphic drivers don't need all
the information of struct display_timing, but would generate a videomode from
the given set of supported signal timings and work with that.
The video subsystems all define their own structs that describe a mode and work
with that (e.g. fb_videomode or drm_display_mode). To slowly replace all those
various structures and allow code reuse across those subsystems, add struct
videomode as a generic description.
This patch only includes the most basic fields in struct videomode. All missing
fields that are needed to have a really generic video mode description can be
added at a later stage.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Afzal Mohammed <Afzal@ti.com>
Tested-by: Rob Clark <robclark@gmail.com>
Tested-by: Leela Krishna Amudala <leelakrishna.a@gmail.com>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/*
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* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
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*
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* generic videomode description
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*
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* This file is released under the GPLv2
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*/
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#ifndef __LINUX_VIDEOMODE_H
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#define __LINUX_VIDEOMODE_H
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#include <linux/types.h>
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#include <video/display_timing.h>
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/*
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* Subsystem independent description of a videomode.
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* Can be generated from struct display_timing.
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*/
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struct videomode {
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unsigned long pixelclock; /* pixelclock in Hz */
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u32 hactive;
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u32 hfront_porch;
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u32 hback_porch;
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u32 hsync_len;
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u32 vactive;
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u32 vfront_porch;
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u32 vback_porch;
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u32 vsync_len;
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unsigned int dmt_flags; /* VESA DMT flags */
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unsigned int data_flags; /* video data flags */
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};
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/**
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* videomode_from_timing - convert display timing to videomode
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* @disp: structure with all possible timing entries
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* @vm: return value
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* @index: index into the list of display timings in devicetree
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*
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* DESCRIPTION:
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* This function converts a struct display_timing to a struct videomode.
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*/
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int videomode_from_timing(const struct display_timings *disp,
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struct videomode *vm, unsigned int index);
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#endif
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