2 files changed, 56 insertions, 0 deletions

diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index cef65574db6c..17ce135a18fd 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -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)
 {
diff --git a/include/linux/fb.h b/include/linux/fb.h
index c7a95714b1fe..100a1765b787 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -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,