diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2020-08-17 14:19:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-09-03 11:21:19 +0200 |
| commit | b32abe570ea99fa4c7538b88a1c95bc28a7872f4 (patch) | |
| tree | 006efac14961ed75af8bcd34edd040e39c6182cb | |
| parent | 01bb0556be4a69066ca9d40f61569f361857c2e5 (diff) | |
i2c: rcar: in slave mode, clear NACK earlier
[ 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>
| -rw-r--r-- | drivers/i2c/busses/i2c-rcar.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 4231673435e7..6be02da2ccc4 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -534,6 +534,7 @@ 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); } |