modetest: fix mode_vrefresh() for interlace/dblscan/vscan

mode_vrefresh() does not take into account interlaced, doublescan, and
multiscan modes, leading to incorrect refresh rates.

Fix this, based on drm_mode_vrefresh() in Linux.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index e714818..4e00bed 100644 (file)
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -138,8 +138,19 @@ static inline int64_t U642I64(uint64_t val)
 
 static float mode_vrefresh(drmModeModeInfo *mode)
 {
-       return  mode->clock * 1000.00
-                       / (mode->htotal * mode->vtotal);
+       unsigned int num, den;
+
+       num = mode->clock;
+       den = mode->htotal * mode->vtotal;
+
+       if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+               num *= 2;
+       if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
+               den *= 2;
+       if (mode->vscan > 1)
+               den *= mode->vscan;
+
+       return num * 1000.00 / den;
 }
 
 #define bit_name_fn(res)                                       \