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authorBiju Das2024-06-18 16:26:31 +0100
committerAlexandre Belloni2024-06-28 00:34:21 +0200
commit43696b3a9e46cf622bfeb70856b9b1cfa5a9fb23 (patch)
treec69625cc49154120c7003b9badfcc565480bbfab
parent0dbd610c426ed695eef5d26584259d96b6250c76 (diff)
rtc: isl1208: Update correct procedure for clearing alarm
As per the latest HW manual[1], there is an internal delay(~250 microsec) from setting ALME = 0 to disabling the alarm function, so the user must add a short delay of greater than 250µs between setting ALME = 0 and clearing ALM. Currently setting of ALME = 0 is done after clearing the ALM, so just reverse the operation and add a delay of 275 microsec. [1]https://www.renesas.com/us/en/document/dst/raa215300-datasheet?r=1506351 Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://lore.kernel.org/r/20240618152635.48956-3-biju.das.jz@bp.renesas.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
-rw-r--r--drivers/rtc/rtc-isl1208.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 6877e2f3bde6..7b82e4a14b7a 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -663,6 +663,13 @@ isl1208_rtc_interrupt(int irq, void *data)
rtc_update_irq(isl1208->rtc, 1, RTC_IRQF | RTC_AF);
+ /* Disable the alarm */
+ err = isl1208_rtc_toggle_alarm(client, 0);
+ if (err)
+ return err;
+
+ fsleep(275);
+
/* Clear the alarm */
sr &= ~ISL1208_REG_SR_ALM;
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
@@ -671,11 +678,6 @@ isl1208_rtc_interrupt(int irq, void *data)
__func__);
else
handled = 1;
-
- /* Disable the alarm */
- err = isl1208_rtc_toggle_alarm(client, 0);
- if (err)
- return err;
}
if (isl1208->config->has_tamper && (sr & ISL1208_REG_SR_EVT)) {