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drm_modes: add of_videomode helpers 

Add helper to get drm_display_mode from devicetree.

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>
This commit is contained in:
Steffen Trumtrar 2012-10-28 18:28:06 +01:00
parent ebc64e4538
commit edb37a95c5
2 changed files with 37 additions and 0 deletions
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33
drivers/gpu/drm/drm_modes.c
View File

@ -35,6 +35,7 @@
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
/**
@ -541,6 +542,38 @@ int drm_display_mode_from_videomode(const struct videomode *vm,
EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
#endif
#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
/**
* of_get_drm_display_mode - get a drm_display_mode from devicetree
* @np: device_node with the timing specification
* @dmode: will be set to the return value
* @index: index into the list of display timings in devicetree
*
* This function is expensive and should only be used, if only one mode is to be
* read from DT. To get multiple modes start with of_get_display_timings and
* work with that instead.
*/
int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, int index)
{
struct videomode vm;
int ret;
ret = of_get_videomode(np, &vm, index);
if (ret)
return ret;
drm_display_mode_from_videomode(&vm, dmode);
pr_debug("%s: got %dx%d display mode from %s\n",
of_node_full_name(np), vm.hactive, vm.vactive, np->name);
drm_mode_debug_printmodeline(dmode);
return 0;
}
EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
#endif
/**
* drm_mode_set_name - set the name on a mode
* @mode: name will be set in this mode

4
include/drm/drmP.h
View File

@ -85,6 +85,7 @@ struct module;
struct drm_file;
struct drm_device;
struct device_node;
struct videomode;
#include <drm/drm_os_linux.h>
@ -1460,6 +1461,9 @@ drm_mode_create_from_cmdline_mode(struct drm_device *dev,
extern int drm_display_mode_from_videomode(const struct videomode *vm,
struct drm_display_mode *dmode);
extern int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode,
int index);
/* Modesetting support */
extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);