diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5b52ab0..f52e6d4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5084,7 +5084,7 @@
 	int pipe = pipe_config->cpu_transcoder;
 	intel_clock_t clock;
 	u32 mdiv;
-	int refclk = 100000, fastclk, update_rate;
+	int refclk = 100000;
 
 	mutex_lock(&dev_priv->dpio_lock);
 	mdiv = vlv_dpio_read(dev_priv, pipe, DPIO_DIV(pipe));
@@ -5096,10 +5096,8 @@
 	clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
 	clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;
 
-	update_rate = refclk / clock.n;
-	clock.vco = update_rate * clock.m1 * clock.m2;
-	fastclk = clock.vco / clock.p1 / clock.p2;
-	clock.dot = (2 * fastclk);
+	clock.vco = refclk * clock.m1 * clock.m2 / clock.n;
+	clock.dot = 2 * clock.vco / (clock.p1 * clock.p2);
 
 	pipe_config->port_clock = clock.dot / 10;
 }