linux-kernel - [PATCH v2] I2C: JZ4780: Fix bug for Ingenic X1000.

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Date:   Fri, 19 Mar 2021 18:12:13 +0800
From:   周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>
To:     wsa@...nel.org, paul@...pouillou.net
Cc:     linux-mips@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, dongsheng.qiu@...enic.com,
        aric.pzqi@...enic.com, ywltyut@...a.cn, sernia.zhou@...mail.com
Subject: [PATCH v2] I2C: JZ4780: Fix bug for Ingenic X1000.

Only send "X1000_I2C_DC_STOP" when last byte, or it will cause
error when I2C write operation.

Fixes: 21575a7a8d4c ("I2C: JZ4780: Add support for the X1000.")

Reported-by: 杨文龙 (Yang Wenlong) <ywltyut@...a.cn>
Tested-by: 杨文龙 (Yang Wenlong) <ywltyut@...a.cn>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
---

Notes:
    v1->v2:
    1.Add missing Reported-by and Tested-by.
    2.Remove change which not related to the bugfix.

 drivers/i2c/busses/i2c-jz4780.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index 8509c5f..55177eb 100644
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -525,8 +525,8 @@ static irqreturn_t jz4780_i2c_irq(int irqno, void *dev_id)
 				i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA);
 				data = *i2c->wbuf;
 				data &= ~JZ4780_I2C_DC_READ;
-				if ((!i2c->stop_hold) && (i2c->cdata->version >=
-						ID_X1000))
+				if ((i2c->wt_len == 1) && (!i2c->stop_hold) &&
+						(i2c->cdata->version >= ID_X1000))
 					data |= X1000_I2C_DC_STOP;
 				jz4780_i2c_writew(i2c, JZ4780_I2C_DC, data);
 				i2c->wbuf++;
-- 
2.7.4