diff --git a/drivers/gpu/drm/i915/display/intel_dpll.c b/drivers/gpu/drm/i915/display/intel_dpll.c
index 53184154bc5d..c0c76ff8b590 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll.c
@@ -425,8 +425,7 @@ i9xx_select_p2_div(const struct intel_limit *limit,
 
 /*
  * Returns a set of divisors for the desired target clock with the given
- * refclk, or FALSE.  The returned values represent the clock equation:
- * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
+ * refclk, or FALSE.
  *
  * Target and reference clocks are specified in kHz.
  *
@@ -484,8 +483,7 @@ i9xx_find_best_dpll(const struct intel_limit *limit,
 
 /*
  * Returns a set of divisors for the desired target clock with the given
- * refclk, or FALSE.  The returned values represent the clock equation:
- * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
+ * refclk, or FALSE.
  *
  * Target and reference clocks are specified in kHz.
  *
@@ -541,8 +539,7 @@ pnv_find_best_dpll(const struct intel_limit *limit,
 
 /*
  * Returns a set of divisors for the desired target clock with the given
- * refclk, or FALSE.  The returned values represent the clock equation:
- * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
+ * refclk, or FALSE.
  *
  * Target and reference clocks are specified in kHz.
  *
@@ -641,8 +638,7 @@ static bool vlv_PLL_is_optimal(struct drm_device *dev, int target_freq,
 
 /*
  * Returns a set of divisors for the desired target clock with the given
- * refclk, or FALSE.  The returned values represent the clock equation:
- * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
+ * refclk, or FALSE.
  */
 static bool
 vlv_find_best_dpll(const struct intel_limit *limit,
@@ -700,8 +696,7 @@ vlv_find_best_dpll(const struct intel_limit *limit,
 
 /*
  * Returns a set of divisors for the desired target clock with the given
- * refclk, or FALSE.  The returned values represent the clock equation:
- * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
+ * refclk, or FALSE.
  */
 static bool
 chv_find_best_dpll(const struct intel_limit *limit,