x1000: delay power thread until valid battery read

Appears to return 0 until the axp has (presumably) completed
its first real measurement.

Note about erosq: keep the power_inint() delay large to ensure
nothing breaks in the bootloader for the time being.

Change-Id: I444e858207cc401c42f1e6ceacf067ad543d4ff8

firmware/powermgmt.c

@@ -693,10 +693,18 @@ static void power_thread(void)
     /* Delay reading the first battery level */
 #ifdef MROBE_100
     while (_battery_voltage() > 4200) /* gives false readings initially */
+    {
 #elif defined(DX50) || defined(DX90)
     while (_battery_voltage() < 1) /* can give false readings initially */
-#endif
     {
+#elif defined(EROS_QN) || defined(FIIO_M3K) || defined(SHANLING_Q1)
+
+    /* wait until the first battery read is ready */
+    while (_battery_voltage() <= 0)
+    {
+#else
+    {
+#endif
         sleep(HZ/100);
     }
 

firmware/target/mips/ingenic_x1000/erosqnative/power-erosqnative.c

@@ -79,8 +79,10 @@ void power_init(void)
     axp_set_charge_current(780);
 
     /* Delay to give power outputs time to stabilize.
-     * Had one report that 190 was not long enough, let's do 250. */
-    mdelay(250);
+     * With the power thread delay, this can apparently go as low as 50,
+     * Keeping a higher value here just to ensure the bootloader works
+     * correctly. */
+    mdelay(200);
 }
 
 #ifdef HAVE_USB_CHARGING_ENABLE