esp32/machine_pwm.c: Fix lightsleep.

Signed-off-by: Ihor Nehrutsa <[email protected]>

Author: IhorNehrutsa

ports/esp32/machine_pwm.c

@@ -392,7 +392,12 @@ static void set_freq(machine_pwm_obj_t *self, unsigned int freq) {
         timer.deconfigure = false;
 
         timer.clk_cfg = LEDC_AUTO_CLK;
-
+        #if !(CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2)
+        ledc_clk_cfg_t clk_cfg = find_clock_in_use();
+        if (clk_cfg != LEDC_AUTO_CLK) {
+            timer.clk_cfg = clk_cfg;
+        } else
+        #endif
         if (self->lightsleep) {
             timer.clk_cfg = LEDC_USE_RC_FAST_CLK; // 8 or 20 MHz
         } else {
@@ -414,7 +419,7 @@ static void set_freq(machine_pwm_obj_t *self, unsigned int freq) {
         }
         #if !(CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2)
         // Check for clock source conflict
-        ledc_clk_cfg_t clk_cfg = find_clock_in_use();
+        clk_cfg = find_clock_in_use();
         if ((clk_cfg != LEDC_AUTO_CLK) && (clk_cfg != timer.clk_cfg)) {
             mp_raise_msg(&mp_type_RuntimeError, MP_ERROR_TEXT("one or more active timers use a different clock source, not supported by the current SoC."));
         }