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fbmon: add of_videomode helpers

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Add helper to get fb_videomode 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 2012-11-14 11:12:38 +01:00
parent 2db54c7239
commit 790890444f
2 changed files with 46 additions and 0 deletions
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42
drivers/video/fbmon.c
View File

@ -31,6 +31,7 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <video/edid.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#ifdef CONFIG_PPC_OF
#include <asm/prom.h>
@ -1425,6 +1426,47 @@ int fb_videomode_from_videomode(const struct videomode *vm,
EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
#endif
#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
static inline void dump_fb_videomode(const struct fb_videomode *m)
{
pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
m->right_margin, m->upper_margin, m->lower_margin,
m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
}
/**
* of_get_fb_videomode - get a fb_videomode from devicetree
* @np: device_node with the timing specification
* @fb: will be set to the return value
* @index: index into the list of display timings in devicetree
*
* DESCRIPTION:
* 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 ond
* work with that instead.
*/
int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
int index)
{
struct videomode vm;
int ret;
ret = of_get_videomode(np, &vm, index);
if (ret)
return ret;
fb_videomode_from_videomode(&vm, fb);
pr_debug("%s: got %dx%d display mode from %s\n",
of_node_full_name(np), vm.hactive, vm.vactive, np->name);
dump_fb_videomode(fb);
return 0;
}
EXPORT_SYMBOL_GPL(of_get_fb_videomode);
#endif
#else
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
{

4
include/linux/fb.h
View File

@ -20,6 +20,7 @@ struct fb_info;
struct device;
struct file;
struct videomode;
struct device_node;
/* Definitions below are used in the parsed monitor specs */
#define FB_DPMS_ACTIVE_OFF 1
@ -715,6 +716,9 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
extern int of_get_fb_videomode(struct device_node *np,
struct fb_videomode *fb,
int index);
extern int fb_videomode_from_videomode(const struct videomode *vm,
struct fb_videomode *fbmode);