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fbmon: add videomode helpers

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Add a function to convert from the generic videomode to a fb_videomode.

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 10:55:04 +01:00
parent cc3f414cf2
commit 2db54c7239
2 changed files with 56 additions and 0 deletions
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52
drivers/video/fbmon.c
View File

@ -31,6 +31,7 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <video/edid.h>
#include <video/videomode.h>
#ifdef CONFIG_PPC_OF
#include <asm/prom.h>
#include <asm/pci-bridge.h>
@ -1373,6 +1374,57 @@ int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_inf
kfree(timings);
return err;
}
#if IS_ENABLED(CONFIG_VIDEOMODE)
int fb_videomode_from_videomode(const struct videomode *vm,
struct fb_videomode *fbmode)
{
unsigned int htotal, vtotal;
fbmode->xres = vm->hactive;
fbmode->left_margin = vm->hback_porch;
fbmode->right_margin = vm->hfront_porch;
fbmode->hsync_len = vm->hsync_len;
fbmode->yres = vm->vactive;
fbmode->upper_margin = vm->vback_porch;
fbmode->lower_margin = vm->vfront_porch;
fbmode->vsync_len = vm->vsync_len;
/* prevent division by zero in KHZ2PICOS macro */
fbmode->pixclock = vm->pixelclock ?
KHZ2PICOS(vm->pixelclock / 1000) : 0;
fbmode->sync = 0;
fbmode->vmode = 0;
if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
if (vm->data_flags & DISPLAY_FLAGS_INTERLACED)
fbmode->vmode |= FB_VMODE_INTERLACED;
if (vm->data_flags & DISPLAY_FLAGS_DOUBLESCAN)
fbmode->vmode |= FB_VMODE_DOUBLE;
fbmode->flag = 0;
htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
vm->hsync_len;
vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
vm->vsync_len;
/* prevent division by zero */
if (htotal && vtotal) {
fbmode->refresh = vm->pixelclock / (htotal * vtotal);
/* a mode must have htotal and vtotal != 0 or it is invalid */
} else {
fbmode->refresh = 0;
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
#endif
#else
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
{

4
include/linux/fb.h
View File

@ -19,6 +19,7 @@ struct vm_area_struct;
struct fb_info;
struct device;
struct file;
struct videomode;
/* Definitions below are used in the parsed monitor specs */
#define FB_DPMS_ACTIVE_OFF 1
@ -714,6 +715,9 @@ 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 fb_videomode_from_videomode(const struct videomode *vm,
struct fb_videomode *fbmode);
/* drivers/video/modedb.c */
#define VESA_MODEDB_SIZE 34
extern void fb_var_to_videomode(struct fb_videomode *mode,