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author | Steffen Trumtrar <s.trumtrar@pengutronix.de> | 2012-12-17 14:20:17 +0100 |
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committer | Steffen Trumtrar <s.trumtrar@pengutronix.de> | 2013-01-24 09:03:04 +0100 |
commit | 8714c0cecfc28f7ce73a520be4831f09743c4fd7 (patch) | |
tree | e0115b23586ce857c0a1257a7a26d638bf2aa3b3 /drivers/video/videomode.c | |
parent | ea4f3111ef0daffa1d11fded6f375227febca458 (diff) | |
download | linux-8714c0cecfc28f7ce73a520be4831f09743c4fd7.tar.bz2 |
video: add display_timing and videomode
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>
Diffstat (limited to 'drivers/video/videomode.c')
-rw-r--r-- | drivers/video/videomode.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/video/videomode.c b/drivers/video/videomode.c new file mode 100644 index 000000000000..21c47a202afa --- /dev/null +++ b/drivers/video/videomode.c @@ -0,0 +1,39 @@ +/* + * generic display timing functions + * + * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix + * + * This file is released under the GPLv2 + */ + +#include <linux/errno.h> +#include <linux/export.h> +#include <video/display_timing.h> +#include <video/videomode.h> + +int videomode_from_timing(const struct display_timings *disp, + struct videomode *vm, unsigned int index) +{ + struct display_timing *dt; + + dt = display_timings_get(disp, index); + if (!dt) + return -EINVAL; + + vm->pixelclock = display_timing_get_value(&dt->pixelclock, TE_TYP); + vm->hactive = display_timing_get_value(&dt->hactive, TE_TYP); + vm->hfront_porch = display_timing_get_value(&dt->hfront_porch, TE_TYP); + vm->hback_porch = display_timing_get_value(&dt->hback_porch, TE_TYP); + vm->hsync_len = display_timing_get_value(&dt->hsync_len, TE_TYP); + + vm->vactive = display_timing_get_value(&dt->vactive, TE_TYP); + vm->vfront_porch = display_timing_get_value(&dt->vfront_porch, TE_TYP); + vm->vback_porch = display_timing_get_value(&dt->vback_porch, TE_TYP); + vm->vsync_len = display_timing_get_value(&dt->vsync_len, TE_TYP); + + vm->dmt_flags = dt->dmt_flags; + vm->data_flags = dt->data_flags; + + return 0; +} +EXPORT_SYMBOL_GPL(videomode_from_timing); |