blob: 562b03530de73798c9d68ec4ba62a66c979af41a [file] [log] [blame]
From a6dcc37b027f3f1e1e0837b145156fd87570f38d Mon Sep 17 00:00:00 2001
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Mon, 29 Jun 2020 17:38:07 +0200
Subject: [PATCH] i2c: rcar: slave: only send STOP event when we have been
addressed
commit 314139f9f0abdba61ed9a8463bbcb0bf900ac5a2 upstream.
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: 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: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 468f94319d51..0b90aa0318df 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -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;
--
2.27.0