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[AUTOSEL,4.4,10/18] i2c: uniphier-f: issue STOP only for last message or I2C_M_STOP

Message ID 20180924144942.164688-10-alexander.levin@microsoft.com
State Superseded
Headers show
Series None | expand

Commit Message

Sasha Levin Sept. 24, 2018, 2:49 p.m. UTC 
From: Masahiro Yamada <yamada.masahiro@socionext.com>


[ Upstream commit 4c85609b08c4761eca0a40fd7beb06bc650f252d ]

This driver currently emits a STOP if the next message is not
I2C_MD_RD.  It should not do it because it disturbs the I2C_RDWR
ioctl, where read/write transactions are combined without STOP
between.

Issue STOP only when the message is the last one _or_ flagged with
I2C_M_STOP.

Fixes: 6a62974b667f ("i2c: uniphier_f: add UniPhier FIFO-builtin I2C driver")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>

---
 drivers/i2c/busses/i2c-uniphier-f.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

-- 
2.17.1
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Patch

diff --git a/drivers/i2c/busses/i2c-uniphier-f.c b/drivers/i2c/busses/i2c-uniphier-f.c
index e8d03bcfe3e0..3f6b43fe4d5d 100644
--- a/drivers/i2c/busses/i2c-uniphier-f.c
+++ b/drivers/i2c/busses/i2c-uniphier-f.c
@@ -394,11 +394,8 @@  static int uniphier_fi2c_master_xfer(struct i2c_adapter *adap,
 		return ret;
 
 	for (msg = msgs; msg < emsg; msg++) {
-		/* If next message is read, skip the stop condition */
-		bool stop = !(msg + 1 < emsg && msg[1].flags & I2C_M_RD);
-		/* but, force it if I2C_M_STOP is set */
-		if (msg->flags & I2C_M_STOP)
-			stop = true;
+		/* Emit STOP if it is the last message or I2C_M_STOP is set. */
+		bool stop = (msg + 1 == emsg) || (msg->flags & I2C_M_STOP);
 
 		ret = uniphier_fi2c_master_xfer_one(adap, msg, stop);
 		if (ret)