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They only surface when the client has >> I2C_CLIENT_PEC set; non-PEC block reads happen to mask each issue in >> turn. >> >> The problems were uncovered driving an adm1266 PMBus device behind a >> Xilinx AXI IIC FPGA block and reading its 64-byte blackbox record. >> >> Patch 1 stops xiic_smbus_block_read_setup() from truncating rx_msg->len. >> The i2c core appends a byte to msg->len when PEC is enabled, so >> overwriting the length to "block size + 1" silently drops the PEC byte >> and i2c_smbus_check_pec() then reads the last payload byte as the PEC. >> >> Patch 2 raises the RX_FULL threshold so the interrupt only fires once >> every remaining byte (payload plus optional PEC) is already buffered in >> the FIFO. The previous threshold of rxmsg_len - 2 caused the >> bytes_rem == 1 path in xiic_read_rx() to NACK a byte still on the wire. >> >> Patch 3 stops the BNB handler from forcing tx_msg->len = 1 to signal >> completion. tx_msg and rx_msg alias the same i2c_msg during a receive, >> so this also clobbered rx_msg->len; and because tx_pos is already at 2 >> in the PEC case, the unsigned subtraction in xiic_tx_space() underflowed >> and the STATE_DONE check fell through to STATE_ERROR. Advancing tx_pos >> up to msg->len drives tx_space to zero without touching the length. >> >> All three patches are pure bug fixes; non-PEC behaviour is unchanged. >> Tested on real hardware -- a Xilinx AXI IIC controller talking to an >> adm1266, where 64-byte PEC-checked block reads now complete cleanly. >> >> Signed-off-by: Abdurrahman Hussain > > LGTM > Reviewed-by: Shubhrajyoti Datta Acked-by: Michal Simek Thanks, Michal