On 7/7/26 01:00, Titus Rwantare wrote:
From: titusr <[email protected]>
The 32 byte payload was raised to 255 for block reads in the SMBus 3.0
specification. SMBus does not provide a way for devices to declare which
version of the spec they are designed to so we must allow newer devices
to return as much data as they allow.
Specification: https://smbus.org/specs/SMBus_3_3_20240512.pdf
6.5.7 Block Write/Read
The Block Write begins with a slave address and a write condition. After the
command code the host issues a byte count which describes how many more bytes
will follow in the message. If a slave has 20 bytes to send, the byte count
field will have the value 20 (14h), followed by the 20 bytes of data. The byte
count does not include the PEC byte. The byte count may be 0. A Block Read or
Block Write is allowed to transfer a maximum of 255 data bytes.
Signed-off-by: Titus Rwantare <[email protected]>
---
hw/i2c/smbus_slave.c | 4 ++--
include/hw/i2c/smbus_slave.h | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
