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

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[ Upstream commit 87aec49936 ]

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: f7414cd692 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Corey Minyard
2024-02-21 20:27:13 +01:00
committed by Greg Kroah-Hartman
parent 2d392f7268
commit fc73118962
1 changed files with 5 additions and 0 deletions
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5
drivers/i2c/busses/i2c-imx.c
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@@ -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;
}