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i2c: rcar: slave: only send STOP event when we have been addressed 

[ Upstream commit 314139f9f0 ]

When the SSR interrupt is activated, it will detect every STOP condition
on the bus, not only the ones after we have been addressed. So, enable
this interrupt only after we have been addressed, and disable it
otherwise.

Fixes: de20d1857d ("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>
5.4-rM2-2.2.x-imx-squashed
Wolfram Sang 2020-06-29 17:38:07 +02:00 committed by Greg Kroah-Hartman
parent 043bc80399
commit 422a01fc23
1 changed files with 4 additions and 3 deletions
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7
drivers/i2c/busses/i2c-rcar.c
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@ -580,13 +580,14 @@ static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv)
rcar_i2c_write(priv, ICSIER, SDR | SSR | SAR);
}
rcar_i2c_write(priv, ICSSR, ~SAR & 0xff);
/* Clear SSR, too, because of old STOPs to other clients than us */
rcar_i2c_write(priv, ICSSR, ~(SAR | SSR) & 0xff);
}
/* master sent stop */
if (ssr_filtered & SSR) {
i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value);
rcar_i2c_write(priv, ICSIER, SAR | SSR);
rcar_i2c_write(priv, ICSIER, SAR);
rcar_i2c_write(priv, ICSSR, ~SSR & 0xff);
}
@ -850,7 +851,7 @@ static int rcar_reg_slave(struct i2c_client *slave)
priv->slave = slave;
rcar_i2c_write(priv, ICSAR, slave->addr);
rcar_i2c_write(priv, ICSSR, 0);
rcar_i2c_write(priv, ICSIER, SAR | SSR);
rcar_i2c_write(priv, ICSIER, SAR);
rcar_i2c_write(priv, ICSCR, SIE | SDBS);
return 0;