pwm: mediatek: Disable clock on PWM configuration failure

Make sure to disable the PWM clock if the PWM cannot be configured due
to the clock divider exceeding the maximum value.

While at it, replace the hardcoded maximum clock divider with a defined
constant to improve code readability.

Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index 6370459..b52f3af 100644 (file)
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -30,6 +30,8 @@
 #define PWMDWIDTH              0x2c
 #define PWMTHRES               0x30
 
+#define PWM_CLK_DIV_MAX                7
+
 enum {
        MTK_CLK_MAIN = 0,
        MTK_CLK_TOP,
@@ -130,8 +132,11 @@ static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
                clkdiv++;
        }
 
-       if (clkdiv > 7)
+       if (clkdiv > PWM_CLK_DIV_MAX) {
+               mtk_pwm_clk_disable(chip, pwm);
+               dev_err(chip->dev, "period %d not supported\n", period_ns);
                return -EINVAL;
+       }
 
        mtk_pwm_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);
        mtk_pwm_writel(pc, pwm->hwpwm, PWMDWIDTH, period_ns / resolution);