net/sched: Retire dsmark qdisc

[linux.git] / drivers / pwm / pwm-tegra.c

diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index dad9978c9186104eb0abb2af7eabf4b2d168141e..249dc019329791b38fd2ff7fe30762cdbb4fec2e 100644 (file)
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -145,8 +145,19 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
                 * source clock rate as required_clk_rate, PWM controller will
                 * be able to configure the requested period.
                 */
-               required_clk_rate =
-                       (NSEC_PER_SEC / period_ns) << PWM_DUTY_WIDTH;
+               required_clk_rate = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC << PWM_DUTY_WIDTH,
+                                                    period_ns);
+
+               if (required_clk_rate > clk_round_rate(pc->clk, required_clk_rate))
+                       /*
+                        * required_clk_rate is a lower bound for the input
+                        * rate; for lower rates there is no value for PWM_SCALE
+                        * that yields a period less than or equal to the
+                        * requested period. Hence, for lower rates, double the
+                        * required_clk_rate to get a clock rate that can meet
+                        * the requested period.
+                        */
+                       required_clk_rate *= 2;
 
                err = dev_pm_opp_set_rate(pc->dev, required_clk_rate);
                if (err < 0)