diff --git a/drivers/gpu/drm/radeon/radeon_legacy_crtc.c b/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
index 22ce4d6015e8..7547ec6418bb 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_crtc.c
@@ -261,7 +261,7 @@ static uint8_t radeon_compute_pll_gain(uint16_t ref_freq, uint16_t ref_div,
 	if (!ref_div)
 		return 1;
 
-	vcoFreq = ((unsigned)ref_freq & fb_div) / ref_div;
+	vcoFreq = ((unsigned)ref_freq * fb_div) / ref_div;
 
 	/*
 	 * This is horribly crude: the VCO frequency range is divided into