target/linux/bcm27xx/patches-5.4/950-0945-rtc-rv3028-Refresh-RAM-on-EEPROM-write.patch

   1 From 010b506d6b215673f188ed5cdc4e35419e3ea715 Mon Sep 17 00:00:00 2001
   2 From: Einar Vading <einar.vading@rhimagnesita.com>
   3 Date: Fri, 14 Aug 2020 22:14:41 +0200
   4 Subject: [PATCH] rtc: rv3028: Refresh RAM on EEPROM write
   5
   6 The active RV3028 settings are in RAM so after modifying the settings in
   7 EEPROM the RAM should be refreshed so that they take effect.
   8
   9 Signed-off-by: Einar Vading <einar.vading@rhimagnesita.com>
  10 ---
  11  drivers/rtc/rtc-rv3028.c | 56 ++++++++++++++++++++++++++++++++++++++++
  12  1 file changed, 56 insertions(+)
  13
  14 --- a/drivers/rtc/rtc-rv3028.c
  15 +++ b/drivers/rtc/rtc-rv3028.c
  16 @@ -66,6 +66,7 @@
  17
  18  #define RV3028_EVT_CTRL_TSR            BIT(2)
  19
  20 +#define RV3028_EEPROM_CMD_REFRESH      0x12
  21  #define RV3028_EEPROM_CMD_WRITE                0x21
  22  #define RV3028_EEPROM_CMD_READ         0x22
  23
  24 @@ -583,6 +584,58 @@ restore_eerd:
  25         return ret;
  26  }
  27
  28 +static int rv3028_ram_refresh(void *priv)
  29 +{
  30 +       u32 status, ctrl1;
  31 +       int ret, err;
  32 +
  33 +       ret = regmap_read(priv, RV3028_CTRL1, &ctrl1);
  34 +       if (ret)
  35 +               return ret;
  36 +
  37 +       if (!(ctrl1 & RV3028_CTRL1_EERD)) {
  38 +               ret = regmap_update_bits(priv, RV3028_CTRL1,
  39 +                                        RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
  40 +               if (ret)
  41 +                       return ret;
  42 +
  43 +               ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
  44 +                                              !(status & RV3028_STATUS_EEBUSY),
  45 +                                              RV3028_EEBUSY_POLL,
  46 +                                              RV3028_EEBUSY_TIMEOUT);
  47 +               if (ret)
  48 +                       goto restore_eerd;
  49 +       }
  50 +
  51 +       ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0);
  52 +       if (ret)
  53 +               goto restore_eerd;
  54 +
  55 +       ret = regmap_write(priv, RV3028_EEPROM_CMD,
  56 +                          RV3028_EEPROM_CMD_REFRESH);
  57 +       if (ret)
  58 +               goto restore_eerd;
  59 +
  60 +       usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
  61 +
  62 +       ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status,
  63 +                                      !(status & RV3028_STATUS_EEBUSY),
  64 +                                      RV3028_EEBUSY_POLL,
  65 +                                      RV3028_EEBUSY_TIMEOUT);
  66 +       if (ret)
  67 +               goto restore_eerd;
  68 +
  69 +restore_eerd:
  70 +       if (!(ctrl1 & RV3028_CTRL1_EERD)) {
  71 +               err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD,
  72 +                                        0);
  73 +               if (err && !ret)
  74 +                       ret = err;
  75 +       }
  76 +
  77 +       return ret;
  78 +}
  79 +
  80  static struct rtc_class_ops rv3028_rtc_ops = {
  81         .read_time = rv3028_get_time,
  82         .set_time = rv3028_set_time,
  83 @@ -723,6 +776,9 @@ static int rv3028_probe(struct i2c_clien
  84                                 ret = rv3028_eeprom_write(
  85                                         (void *)(rv3028->regmap),
  86                                         RV3028_BACKUP, (void *)&backup, 1);
  87 +
  88 +                               if (!ret)
  89 +                                       ret = rv3028_ram_refresh((void *)(rv3028->regmap));
  90                         }
  91                 }
  92