From 7d280ab07589896af527501a38cd95c7f97dcdf2 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 12 Jul 2023 12:16:39 +0100 Subject: [PATCH] UPSTREAM: regmap: Drop initial version of maximum transfer length fixes commit bc64734825c59e18a27ac266b07e14944c111fd8 upstream. 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 Bug: 305125309 Bug: 306531597 Fixes: 3981514180c9 ("regmap: Account for register length when chunking") Fixes: c8e796895e23 ("regmap: spi-avmm: Fix regmap_bus max_raw_write") Change-Id: Idb4ef8cb6e304def1423304575a8fc27a41719b0 Signed-off-by: Mark Brown Reviewed-by: Xu Yilun Cc: stable@kernel.org Link: https://lore.kernel.org/r/20230712-regmap-max-transfer-v1-1-80e2aed22e83@kernel.org Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman (cherry picked from commit d70cd8813c04958af53efda1f78d845177823f53) --- drivers/base/regmap/regmap-spi-avmm.c | 2 +- drivers/base/regmap/regmap.c | 6 ++---- 2 files changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/base/regmap/regmap-spi-avmm.c b/drivers/base/regmap/regmap-spi-avmm.c index 67f89937219c..ad1da83e849f 100644 --- a/drivers/base/regmap/regmap-spi-avmm.c +++ b/drivers/base/regmap/regmap-spi-avmm.c @@ -666,7 +666,7 @@ 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 e65888d84222..8f9fe5fd4707 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -2042,8 +2042,6 @@ 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) @@ -2051,8 +2049,8 @@ 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;