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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>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/*
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* generic display timing functions
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*
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* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
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*
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* This file is released under the GPLv2
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*/
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <video/display_timing.h>
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#include <video/videomode.h>
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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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{
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struct display_timing *dt;
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dt = display_timings_get(disp, index);
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if (!dt)
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return -EINVAL;
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vm->pixelclock = display_timing_get_value(&dt->pixelclock, TE_TYP);
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vm->hactive = display_timing_get_value(&dt->hactive, TE_TYP);
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vm->hfront_porch = display_timing_get_value(&dt->hfront_porch, TE_TYP);
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vm->hback_porch = display_timing_get_value(&dt->hback_porch, TE_TYP);
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vm->hsync_len = display_timing_get_value(&dt->hsync_len, TE_TYP);
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vm->vactive = display_timing_get_value(&dt->vactive, TE_TYP);
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vm->vfront_porch = display_timing_get_value(&dt->vfront_porch, TE_TYP);
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vm->vback_porch = display_timing_get_value(&dt->vback_porch, TE_TYP);
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vm->vsync_len = display_timing_get_value(&dt->vsync_len, TE_TYP);
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vm->dmt_flags = dt->dmt_flags;
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vm->data_flags = dt->data_flags;
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return 0;
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}
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EXPORT_SYMBOL_GPL(videomode_from_timing);
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