rtc: ds1685: Fix bank switching to avoid endless loop

ds1685_rtc_begin_data_access() tried to access an extended register before
enabling access to it by switching to bank 1. Depending on content in NVRAM
this could lead to an endless loop. While at it fix also switch back to
bank 0 in ds1685_rtc_end_data_access().
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Joshua Kinard <kumba@gentoo.org>
Link: https://lore.kernel.org/r/20200910084124.138560-1-tsbogend@alpha.franken.de

drivers/rtc/rtc-ds1685.c

@@ -193,12 +193,12 @@ ds1685_rtc_begin_data_access(struct ds1685_priv *rtc)
 	rtc->write(rtc, RTC_CTRL_B,
 		   (rtc->read(rtc, RTC_CTRL_B) | RTC_CTRL_B_SET));
 
+	/* Switch to Bank 1 */
+	ds1685_rtc_switch_to_bank1(rtc);
+
 	/* Read Ext Ctrl 4A and check the INCR bit to avoid a lockout. */
 	while (rtc->read(rtc, RTC_EXT_CTRL_4A) & RTC_CTRL_4A_INCR)
 		cpu_relax();
-
-	/* Switch to Bank 1 */
-	ds1685_rtc_switch_to_bank1(rtc);
 }
 
 /**
@@ -213,7 +213,7 @@ static inline void
 ds1685_rtc_end_data_access(struct ds1685_priv *rtc)
 {
 	/* Switch back to Bank 0 */
-	ds1685_rtc_switch_to_bank1(rtc);
+	ds1685_rtc_switch_to_bank0(rtc);
 
 	/* Clear the SET bit in Ctrl B */
 	rtc->write(rtc, RTC_CTRL_B,