drm_modes: add videomode helpers

Add conversion from videomode to drm_display_mode

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>

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index d8da30e90db5..9f3f20bde399 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -35,6 +35,7 @@
 #include <linux/export.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
+#include <video/videomode.h>
 
 /**
  * drm_mode_debug_printmodeline - debug print a mode
@@ -504,6 +505,42 @@ drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
 }
 EXPORT_SYMBOL(drm_gtf_mode);
 
+#if IS_ENABLED(CONFIG_VIDEOMODE)
+int drm_display_mode_from_videomode(const struct videomode *vm,
+                                    struct drm_display_mode *dmode)
+{
+        dmode->hdisplay = vm->hactive;
+        dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
+        dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
+        dmode->htotal = dmode->hsync_end + vm->hback_porch;
+
+        dmode->vdisplay = vm->vactive;
+        dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
+        dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
+        dmode->vtotal = dmode->vsync_end + vm->vback_porch;
+
+        dmode->clock = vm->pixelclock / 1000;
+
+        dmode->flags = 0;
+        if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
+                dmode->flags |= DRM_MODE_FLAG_PHSYNC;
+        else if (vm->dmt_flags & VESA_DMT_HSYNC_LOW)
+                dmode->flags |= DRM_MODE_FLAG_NHSYNC;
+        if (vm->dmt_flags & VESA_DMT_VSYNC_HIGH)
+                dmode->flags |= DRM_MODE_FLAG_PVSYNC;
+        else if (vm->dmt_flags & VESA_DMT_VSYNC_LOW)
+                dmode->flags |= DRM_MODE_FLAG_NVSYNC;
+        if (vm->data_flags & DISPLAY_FLAGS_INTERLACED)
+                dmode->flags |= DRM_MODE_FLAG_INTERLACE;
+        if (vm->data_flags & DISPLAY_FLAGS_DOUBLESCAN)
+                dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
+        drm_mode_set_name(dmode);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
+#endif
+
 /**
  * drm_mode_set_name - set the name on a mode
  * @mode: name will be set in this mode