5.4-stable review patch. If anyone has any objections, please let me know.
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From: Grygorii Tertychnyi grembeter@gmail.com
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: 18f98b1e3147 ("[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 --- drivers/i2c/busses/i2c-ocores.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -443,8 +443,8 @@ static int ocores_init(struct device *de 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; }