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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
93 lines
2.3 KiB
Diff
93 lines
2.3 KiB
Diff
From 010b506d6b215673f188ed5cdc4e35419e3ea715 Mon Sep 17 00:00:00 2001
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From: Einar Vading <einar.vading@rhimagnesita.com>
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Date: Fri, 14 Aug 2020 22:14:41 +0200
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Subject: [PATCH] rtc: rv3028: Refresh RAM on EEPROM write
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The active RV3028 settings are in RAM so after modifying the settings in
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EEPROM the RAM should be refreshed so that they take effect.
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Signed-off-by: Einar Vading <einar.vading@rhimagnesita.com>
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---
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drivers/rtc/rtc-rv3028.c | 56 ++++++++++++++++++++++++++++++++++++++++
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1 file changed, 56 insertions(+)
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--- a/drivers/rtc/rtc-rv3028.c
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+++ b/drivers/rtc/rtc-rv3028.c
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@@ -66,6 +66,7 @@
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#define RV3028_EVT_CTRL_TSR BIT(2)
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+#define RV3028_EEPROM_CMD_REFRESH 0x12
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#define RV3028_EEPROM_CMD_WRITE 0x21
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#define RV3028_EEPROM_CMD_READ 0x22
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@@ -583,6 +584,58 @@ restore_eerd:
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return ret;
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}
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+static int rv3028_ram_refresh(void *priv)
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+{
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+ u32 status, ctrl1;
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+ int ret, err;
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+
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+ ret = regmap_read(priv, RV3028_CTRL1, &ctrl1);
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+ if (ret)
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+ return ret;
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+
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+ if (!(ctrl1 & RV3028_CTRL1_EERD)) {
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+ ret = regmap_update_bits(priv, RV3028_CTRL1,
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+ RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
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+ if (ret)
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+ return ret;
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+
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+ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
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+ !(status & RV3028_STATUS_EEBUSY),
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+ RV3028_EEBUSY_POLL,
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+ RV3028_EEBUSY_TIMEOUT);
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+ if (ret)
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+ goto restore_eerd;
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+ }
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+
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+ ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0);
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+ if (ret)
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+ goto restore_eerd;
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+
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+ ret = regmap_write(priv, RV3028_EEPROM_CMD,
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+ RV3028_EEPROM_CMD_REFRESH);
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+ if (ret)
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+ goto restore_eerd;
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+
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+ usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
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+
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+ ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
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+ !(status & RV3028_STATUS_EEBUSY),
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+ RV3028_EEBUSY_POLL,
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+ RV3028_EEBUSY_TIMEOUT);
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+ if (ret)
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+ goto restore_eerd;
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+
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+restore_eerd:
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+ if (!(ctrl1 & RV3028_CTRL1_EERD)) {
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+ err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD,
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+ 0);
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+ if (err && !ret)
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+ ret = err;
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+ }
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+
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+ return ret;
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+}
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+
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static struct rtc_class_ops rv3028_rtc_ops = {
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.read_time = rv3028_get_time,
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.set_time = rv3028_set_time,
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@@ -723,6 +776,9 @@ static int rv3028_probe(struct i2c_clien
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ret = rv3028_eeprom_write(
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(void *)(rv3028->regmap),
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RV3028_BACKUP, (void *)&backup, 1);
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+
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+ if (!ret)
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+ ret = rv3028_ram_refresh((void *)(rv3028->regmap));
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}
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}
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