From 73778e237003a579f1b998d518e0083e0cb25b3f Mon Sep 17 00:00:00 2001 From: Tali Perry Date: Wed, 25 May 2022 11:23:39 +0800 Subject: [PATCH] i2c: npcm: Correct slave role behavior [ Upstream commit d7aa1b149b8fc04d802879cf4662010aa4a42deb ] Correct the slave transaction logic to be compatible with the generic slave backend driver. Fixes: 56a1485b102e ("i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver") Signed-off-by: Tali Perry Signed-off-by: Tyrone Ting Reviewed-by: Andy Shevchenko Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-npcm7xx.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c index ab31e7f..31e3d2c 100644 --- a/drivers/i2c/busses/i2c-npcm7xx.c +++ b/drivers/i2c/busses/i2c-npcm7xx.c @@ -912,11 +912,15 @@ static int npcm_i2c_slave_get_wr_buf(struct npcm_i2c *bus) for (i = 0; i < I2C_HW_FIFO_SIZE; i++) { if (bus->slv_wr_size >= I2C_HW_FIFO_SIZE) break; - i2c_slave_event(bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + if (bus->state == I2C_SLAVE_MATCH) { + i2c_slave_event(bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + bus->state = I2C_OPER_STARTED; + } else { + i2c_slave_event(bus->slave, I2C_SLAVE_READ_PROCESSED, &value); + } ind = (bus->slv_wr_ind + bus->slv_wr_size) % I2C_HW_FIFO_SIZE; bus->slv_wr_buf[ind] = value; bus->slv_wr_size++; - i2c_slave_event(bus->slave, I2C_SLAVE_READ_PROCESSED, &value); } return I2C_HW_FIFO_SIZE - ret; } @@ -964,7 +968,6 @@ static void npcm_i2c_slave_xmit(struct npcm_i2c *bus, u16 nwrite, if (nwrite == 0) return; - bus->state = I2C_OPER_STARTED; bus->operation = I2C_WRITE_OPER; /* get the next buffer */ -- 2.7.4