cvt: Allow multiple-of-60Hz refresh rates for reduced blanking.

Doing so generates the same timings as given in the DMT spec for
120Hz RB, so we should be set there.  Other rates might be legal
too but why push our luck.

1 files changed, 8 insertions, 5 deletions

diff --git a/hw/xfree86/utils/cvt/cvt.c b/hw/xfree86/utils/cvt/cvt.c
index 500e31f23..cf0a479f2 100644
--- a/hw/xfree86/utils/cvt/cvt.c
+++ b/hw/xfree86/utils/cvt/cvt.c
@@ -261,11 +261,14 @@ main (int argc, char *argv[])
         HDisplay += 8;
     }
 
-    if (Reduced && (VRefresh != 60.0)) {
-        fprintf(stderr, "\nERROR: 60Hz refresh rate required for reduced"
-                " blanking.\n");
-        PrintUsage(argv[0]);
-        return 0;
+    if (Reduced) {
+	if ((VRefresh / 60.0) != floor(VRefresh / 60.0)) {
+	    fprintf(stderr,
+		    "\nERROR: Multiple of 60Hz refresh rate required for "
+		    " reduced blanking.\n");
+	    PrintUsage(argv[0]);
+	    return 0;
+	}
     }
 
     IsCVT = CVTCheckStandard(HDisplay, VDisplay, VRefresh, Reduced, Verbose);