This is a note to let you know that I've just added the patch titled
I2C: JZ4780: Fix bug for Ingenic X1000.
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-jz4780-fix-bug-for-ingenic-x1000.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 401bcb376bf25258a7445fd4eeb1c4396054138a
Author: ��� (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
Date: Fri Mar 19 18:12:13 2021 +0800
I2C: JZ4780: Fix bug for Ingenic X1000.
[ Upstream commit 942bfbecc0281c75db84f744b9b77b0f2396f484 ]
Only send "X1000_I2C_DC_STOP" when last byte, or it will cause
error when I2C write operation which should look like this:
device_addr + w, reg_addr, data;
But without this patch, it looks like this:
device_addr + w, reg_addr, device_addr + w, data;
Fixes: 21575a7a8d4c ("I2C: JZ4780: Add support for the X1000.")
Reported-by: æ?¨æ??é¾? (Yang Wenlong) <ywltyut@xxxxxxx>
Tested-by: æ?¨æ??é¾? (Yang Wenlong) <ywltyut@xxxxxxx>
Signed-off-by: ��� (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index cb4a25ebb890..2a946c207928 100644
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -526,8 +526,8 @@ 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++;
