This is a note to let you know that I've just added the patch titled
i2c: imx: when being a target, mark the last read as processed
to the 5.15-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-imx-when-being-a-target-mark-the-last-read-as-pr.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f6760a91c5bd52a9aa9e603ae886741ca50345d9
Author: Corey Minyard <minyard@xxxxxxx>
Date: Wed Feb 21 20:27:13 2024 +0100
i2c: imx: when being a target, mark the last read as processed
[ Upstream commit 87aec499368d488c20292952d6d4be7cb9e49c5e ]
When being a target, NAK from the controller means that all bytes have
been transferred. So, the last byte needs also to be marked as
'processed'. Otherwise index registers of backends may not increase.
Fixes: f7414cd6923f ("i2c: imx: support slave mode for imx I2C driver")
Signed-off-by: Corey Minyard <minyard@xxxxxxx>
Tested-by: Andrew Manley <andrew.manley@xxxxxxxxxxxxxxx>
Reviewed-by: Andrew Manley <andrew.manley@xxxxxxxxxxxxxxx>
Reviewed-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
[wsa: fixed comment and commit message to properly describe the case]
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index d545547c89ca7..fae674969628b 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -771,6 +771,11 @@ static irqreturn_t i2c_imx_slave_handle(struct imx_i2c_struct *i2c_imx,
ctl &= ~I2CR_MTX;
imx_i2c_write_reg(ctl, i2c_imx, IMX_I2C_I2CR);
imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR);
+
+ /* flag the last byte as processed */
+ i2c_imx_slave_event(i2c_imx,
+ I2C_SLAVE_READ_PROCESSED, &value);
+
i2c_imx_slave_finish_op(i2c_imx);
return IRQ_HANDLED;
}
