drm_modes: add drm_display_mode_to_videomode

Add conversion from drm_display_mode to videomode.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

2 files changed, 42 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 6d8b941c8200..9731aeba40a6 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -615,6 +615,46 @@ void drm_display_mode_from_videomode(const struct videomode *vm,
 }
 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
 
+/**
+ * drm_display_mode_to_videomode - fill in @vm using @dmode,
+ * @dmode: drm_display_mode structure to use as source
+ * @vm: videomode structure to use as destination
+ *
+ * Fills out @vm using the display mode specified in @dmode.
+ */
+void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
+                                   struct videomode *vm)
+{
+        vm->hactive = dmode->hdisplay;
+        vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
+        vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
+        vm->hback_porch = dmode->htotal - dmode->hsync_end;
+
+        vm->vactive = dmode->vdisplay;
+        vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
+        vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
+        vm->vback_porch = dmode->vtotal - dmode->vsync_end;
+
+        vm->pixelclock = dmode->clock * 1000;
+
+        vm->flags = 0;
+        if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
+                vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
+        else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
+                vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
+        if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
+                vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
+        else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
+                vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
+        if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
+                vm->flags |= DISPLAY_FLAGS_INTERLACED;
+        if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
+                vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
+        if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
+                vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
+}
+EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
+
 #ifdef CONFIG_OF
 /**
  * of_get_drm_display_mode - get a drm_display_mode from devicetree
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 91d0582f924e..321ae6411546 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -197,6 +197,8 @@ struct drm_display_mode *drm_gtf_mode_complex(struct drm_device *dev,
                                               int GTF_K, int GTF_2J);
 void drm_display_mode_from_videomode(const struct videomode *vm,
                                      struct drm_display_mode *dmode);
+void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
+                                   struct videomode *vm);
 int of_get_drm_display_mode(struct device_node *np,
                             struct drm_display_mode *dmode,
                             int index);