[PATCH 3/6] drm_modes: add videomode_from_drm_display_mode

[slongerb...@gmail.com]

From: Steve Longerbeam <steve_longerb...@mentor.com>

Add conversion from drm_display_mode to videomode.

Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
---
 drivers/gpu/drm/drm_modes.c |   40 ++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_modes.h     |    2 ++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 6d8b941..583a391 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);

+/**
+ * videomode_from_drm_display_mode - 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 videomode_from_drm_display_mode(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(videomode_from_drm_display_mode);
+
 #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 91d0582..60c0144 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 videomode_from_drm_display_mode(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);
-- 
1.7.9.5