OrgACRN
/
acrn-kernel
mirror of https://github.com/projectacrn/acrn-kernel.git
1
0
Fork 0
Code Issues Releases Wiki Activity

regmap: Account for register length in SMBus I/O limits 

commit 0c9d2eb5e9 upstream.

The SMBus I2C buses have limits on the size of transfers they can do but
do not factor in the register length meaning we may try to do a transfer
longer than our length limit, the core will not take care of this.
Future changes will factor this out into the core but there are a number
of users that assume current behaviour so let's just do something
conservative here.

This does not take account padding bits but practically speaking these
are very rarely if ever used on I2C buses given that they generally run
slowly enough to mean there's no issue.

Cc: stable@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20230712-regmap-max-transfer-v1-2-80e2aed22e83@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Brown 2023-07-12 12:16:40 +01:00 committed by Greg Kroah-Hartman
parent ef7ad397fb
commit 3e463a4f38
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/base/regmap/regmap-i2c.c
View File

@ -242,8 +242,8 @@ static int regmap_i2c_smbus_i2c_read(void *context, const void *reg,
static const struct regmap_bus regmap_i2c_smbus_i2c_block = { static const struct regmap_bus regmap_i2c_smbus_i2c_block = {
.write = regmap_i2c_smbus_i2c_write, .write = regmap_i2c_smbus_i2c_write,
.read = regmap_i2c_smbus_i2c_read, .read = regmap_i2c_smbus_i2c_read,
.max_raw_read = I2C_SMBUS_BLOCK_MAX, .max_raw_read = I2C_SMBUS_BLOCK_MAX - 1,
.max_raw_write = I2C_SMBUS_BLOCK_MAX, .max_raw_write = I2C_SMBUS_BLOCK_MAX - 1,
}; };
static int regmap_i2c_smbus_i2c_write_reg16(void *context, const void *data, static int regmap_i2c_smbus_i2c_write_reg16(void *context, const void *data,
@ -299,8 +299,8 @@ static int regmap_i2c_smbus_i2c_read_reg16(void *context, const void *reg,
static const struct regmap_bus regmap_i2c_smbus_i2c_block_reg16 = { static const struct regmap_bus regmap_i2c_smbus_i2c_block_reg16 = {
.write = regmap_i2c_smbus_i2c_write_reg16, .write = regmap_i2c_smbus_i2c_write_reg16,
.read = regmap_i2c_smbus_i2c_read_reg16, .read = regmap_i2c_smbus_i2c_read_reg16,
.max_raw_read = I2C_SMBUS_BLOCK_MAX, .max_raw_read = I2C_SMBUS_BLOCK_MAX - 2,
.max_raw_write = I2C_SMBUS_BLOCK_MAX, .max_raw_write = I2C_SMBUS_BLOCK_MAX - 2,
}; };
static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c, static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c,