From: Wolfram Sang wsa+renesas@sang-engineering.com
[ Upstream commit 914a7b3563b8fb92f976619bbd0fa3a4a708baae ]
Currently, a NACK in slave mode is set/cleared when SCL is held low by the IP core right before the bit is about to be pushed out. This is too late for clearing and then a NACK from the previous byte is still used for the current one. Now, let's clear the NACK right after we detected the STOP condition following the NACK.
Fixes: de20d1857dd6 ("i2c: rcar: add slave support") Signed-off-by: Wolfram Sang wsa+renesas@sang-engineering.com Signed-off-by: Wolfram Sang wsa@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/i2c/busses/i2c-rcar.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index dcdce18fc706..f9029800d399 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -594,6 +594,7 @@ static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv) /* master sent stop */ if (ssr_filtered & SSR) { i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value); + rcar_i2c_write(priv, ICSCR, SIE | SDBS); /* clear our NACK */ rcar_i2c_write(priv, ICSIER, SAR); rcar_i2c_write(priv, ICSSR, ~SSR & 0xff); }