target/linux/generic/backport-5.15/352-v6.3-regmap-apply-reg_base-and-reg_downshift-for-single-r.patch

   1 From 697c3892d825fb78f42ec8e53bed065dd728db3e Mon Sep 17 00:00:00 2001
   2 From: Daniel Golle <daniel@makrotopia.org>
   3 Date: Mon, 30 Jan 2023 02:04:57 +0000
   4 Subject: [PATCH] regmap: apply reg_base and reg_downshift for single register
   5  ops
   6
   7 reg_base and reg_downshift currently don't have any effect if used with
   8 a regmap_bus or regmap_config which only offers single register
   9 operations (ie. reg_read, reg_write and optionally reg_update_bits).
  10
  11 Fix that and take them into account also for regmap_bus with only
  12 reg_read and read_write operations by applying reg_base and
  13 reg_downshift in _regmap_bus_reg_write, _regmap_bus_reg_read.
  14
  15 Also apply reg_base and reg_downshift in _regmap_update_bits, but only
  16 in case the operation is carried out with a reg_update_bits call
  17 defined in either regmap_bus or regmap_config.
  18
  19 Fixes: 0074f3f2b1e43d ("regmap: allow a defined reg_base to be added to every address")
  20 Fixes: 86fc59ef818beb ("regmap: add configurable downshift for addresses")
  21 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  22 Tested-by: Colin Foster <colin.foster@in-advantage.com>
  23 Link: https://lore.kernel.org/r/Y9clyVS3tQEHlUhA@makrotopia.org
  24 Signed-off-by: Mark Brown <broonie@kernel.org>
  25 ---
  26  drivers/base/regmap/regmap.c | 6 ++++++
  27  1 file changed, 6 insertions(+)
  28
  29 --- a/drivers/base/regmap/regmap.c
  30 +++ b/drivers/base/regmap/regmap.c
  31 @@ -1929,6 +1929,8 @@ static int _regmap_bus_reg_write(void *c
  32  {
  33         struct regmap *map = context;
  34
  35 +       reg += map->reg_base;
  36 +       reg >>= map->format.reg_downshift;
  37         return map->bus->reg_write(map->bus_context, reg, val);
  38  }
  39
  40 @@ -2703,6 +2705,8 @@ static int _regmap_bus_reg_read(void *co
  41  {
  42         struct regmap *map = context;
  43
  44 +       reg += map->reg_base;
  45 +       reg >>= map->format.reg_downshift;
  46         return map->bus->reg_read(map->bus_context, reg, val);
  47  }
  48
  49 @@ -3078,6 +3082,8 @@ static int _regmap_update_bits(struct re
  50                 *change = false;
  51
  52         if (regmap_volatile(map, reg) && map->reg_update_bits) {
  53 +               reg += map->reg_base;
  54 +               reg >>= map->format.reg_downshift;
  55                 ret = map->reg_update_bits(map->bus_context, reg, mask, val);
  56                 if (ret == 0 && change)
  57                         *change = true;