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i2c: ocores: set IACK bit after core is enabled 

commit 5a72477273066b5b357801ab2d315ef14949d402 upstream.

Setting IACK bit when core is disabled does not clear the "Interrupt Flag"
bit in the status register, and the interrupt remains pending.

Sometimes it causes failure for the very first message transfer, that is
usually a device probe.

Hence, set IACK bit after core is enabled to clear pending interrupt.

Fixes: 18f98b1e31 ("[PATCH] i2c: New bus driver for the OpenCores I2C controller")
Signed-off-by: Grygorii Tertychnyi <grygorii.tertychnyi@leica-geosystems.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Cc: stable@vger.kernel.org
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Grygorii Tertychnyi 2024-05-20 17:39:32 +02:00 committed by Greg Kroah-Hartman
parent 84d3549d54
commit 391251d496
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/busses/i2c-ocores.c
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@ -442,8 +442,8 @@ static int ocores_init(struct device *dev, struct ocores_i2c *i2c)
oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8);
/* Init the device */
oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK);
oc_setreg(i2c, OCI2C_CONTROL, ctrl | OCI2C_CTRL_EN);
oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK);
return 0;
}