37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
From c3cfd27eb16d2fc12cfa77e6cd5f9eb352403c16 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Fri, 15 Oct 2021 11:45:36 +0100
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Subject: [PATCH] rtc: pcf85063: Always clear EXT_TEST from set_time
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Power-on reset after the insertion of a battery does not always complete
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successfully, leading to corrupted register content. The EXT_TEST bit
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will stop the clock from running, but currently the driver will never
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recover.
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Safely handle the erroneous state by clearing EXT_TEST as part of the
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usual set_time method.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/rtc/rtc-pcf85063.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/rtc/rtc-pcf85063.c
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+++ b/drivers/rtc/rtc-pcf85063.c
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@@ -34,6 +34,7 @@
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#define PCF85063_REG_CTRL1 0x00 /* status */
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#define PCF85063_REG_CTRL1_CAP_SEL BIT(0)
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#define PCF85063_REG_CTRL1_STOP BIT(5)
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+#define PCF85063_REG_CTRL1_EXT_TEST BIT(7)
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#define PCF85063_REG_CTRL2 0x01
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#define PCF85063_CTRL2_AF BIT(6)
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@@ -117,6 +118,7 @@ static int pcf85063_rtc_set_time(struct
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* reset state until all time/date registers are written
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*/
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rc = regmap_update_bits(pcf85063->regmap, PCF85063_REG_CTRL1,
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+ PCF85063_REG_CTRL1_EXT_TEST |
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PCF85063_REG_CTRL1_STOP,
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PCF85063_REG_CTRL1_STOP);
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if (rc)
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