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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>
25 lines
515 B
C
25 lines
515 B
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/export.h>
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#include <linux/slab.h>
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#include <video/display_timing.h>
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void display_timings_release(struct display_timings *disp)
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{
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if (disp->timings) {
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unsigned int i;
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for (i = 0; i < disp->num_timings; i++)
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kfree(disp->timings[i]);
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kfree(disp->timings);
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}
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kfree(disp);
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}
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EXPORT_SYMBOL_GPL(display_timings_release);
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