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i2c: rcar: slave: only send STOP event when we have been addressed
[ Upstream commit314139f9f0
] 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>
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parent
043bc80399
commit
422a01fc23
1 changed files with 4 additions and 3 deletions
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@ -580,13 +580,14 @@ static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv)
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rcar_i2c_write(priv, ICSIER, SDR | SSR | SAR);
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}
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rcar_i2c_write(priv, ICSSR, ~SAR & 0xff);
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/* Clear SSR, too, because of old STOPs to other clients than us */
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rcar_i2c_write(priv, ICSSR, ~(SAR | SSR) & 0xff);
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}
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/* master sent stop */
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if (ssr_filtered & SSR) {
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i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value);
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rcar_i2c_write(priv, ICSIER, SAR | SSR);
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rcar_i2c_write(priv, ICSIER, SAR);
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rcar_i2c_write(priv, ICSSR, ~SSR & 0xff);
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}
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@ -850,7 +851,7 @@ static int rcar_reg_slave(struct i2c_client *slave)
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priv->slave = slave;
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rcar_i2c_write(priv, ICSAR, slave->addr);
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rcar_i2c_write(priv, ICSSR, 0);
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rcar_i2c_write(priv, ICSIER, SAR | SSR);
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rcar_i2c_write(priv, ICSIER, SAR);
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rcar_i2c_write(priv, ICSCR, SIE | SDBS);
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return 0;
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