regmap: Drop initial version of maximum transfer length fixes

When problems were noticed with the register address not being taken
into account when limiting raw transfers with I2C devices we fixed this
in the core.  Unfortunately it has subsequently been realised that a lot
of buses were relying on the prior behaviour, partly due to unclear
documentation not making it obvious what was intended in the core.  This
is all more involved to fix than is sensible for a fix commit so let's
just drop the original fixes, a separate commit will fix the originally
observed problem in an I2C specific way

Fixes: 3981514180c9 ("regmap: Account for register length when chunking")
Fixes: c8e796895e23 ("regmap: spi-avmm: Fix regmap_bus max_raw_write")
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20230712-regmap-max-transfer-v1-1-80e2aed22e83@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/base/regmap/regmap-spi-avmm.c b/drivers/base/regmap/regmap-spi-avmm.c
index 6af6928..4c2b94b 100644 (file)
--- a/drivers/base/regmap/regmap-spi-avmm.c
+++ b/drivers/base/regmap/regmap-spi-avmm.c
@@ -660,7 +660,7 @@ static const struct regmap_bus regmap_spi_avmm_bus = {
        .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
        .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
        .max_raw_read = SPI_AVMM_VAL_SIZE * MAX_READ_CNT,
-       .max_raw_write = SPI_AVMM_REG_SIZE + SPI_AVMM_VAL_SIZE * MAX_WRITE_CNT,
+       .max_raw_write = SPI_AVMM_VAL_SIZE * MAX_WRITE_CNT,
        .free_context = spi_avmm_bridge_ctx_free,
 };
 

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 89a7f1c..1bfd172 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2082,8 +2082,6 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
        size_t val_count = val_len / val_bytes;
        size_t chunk_count, chunk_bytes;
        size_t chunk_regs = val_count;
-       size_t max_data = map->max_raw_write - map->format.reg_bytes -
-                       map->format.pad_bytes;
        int ret, i;
 
        if (!val_count)
@@ -2091,8 +2089,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
 
        if (map->use_single_write)
                chunk_regs = 1;
-       else if (map->max_raw_write && val_len > max_data)
-               chunk_regs = max_data / val_bytes;
+       else if (map->max_raw_write && val_len > map->max_raw_write)
+               chunk_regs = map->max_raw_write / val_bytes;
 
        chunk_count = val_count / chunk_regs;
        chunk_bytes = chunk_regs * val_bytes;