i2c: imx: when being a target, mark the last read as processed

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@acm.org>
Tested-by: Andrew Manley <andrew.manley@sealingtech.com>
Reviewed-by: Andrew Manley <andrew.manley@sealingtech.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
[wsa: fixed comment and commit message to properly describe the case]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 88a053987403cc6f59c3def73fd52cd11e2b1359..60e813137f8442895b19c6e9d871252cc32c7f24 100644 (file)
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -803,6 +803,11 @@ 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;
        }