From 83b742df77e9edd0fb2290567097c5d5dc0c2c55 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Fri, 6 Dec 2019 17:08:07 +0100
Subject: drm_common: fix display FPS estimation for interlaced modes

---
 video/out/drm_common.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/video/out/drm_common.c b/video/out/drm_common.c
index 51134a3c00..9c56227b9e 100644
--- a/video/out/drm_common.c
+++ b/video/out/drm_common.c
@@ -626,7 +626,10 @@ void kms_destroy(struct kms *kms)
 
 static double mode_get_Hz(const drmModeModeInfo *mode)
 {
-    return mode->clock * 1000.0 / mode->htotal / mode->vtotal;
+    double rate = mode->clock * 1000.0 / mode->htotal / mode->vtotal;
+    if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+        rate *= 2.0;
+    return rate;
 }
 
 static void kms_show_available_modes(
-- 
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