Dear Andreas Werner,
> Using the i2c-eg20t driver and call i2cdetect or probe on the bus,
> the driver will print a lot of error messages if there was no ACK
> received.
>
> i2cdetect normally print a table with all the available devices. If there
> is no device on the address, the table will be empty.
> Currently with the i2c-eg20t driver, the table is not visible because
> the error messages destroy the table.
>
> Error message: pch_i2c_getack return -71
>
> This patch prevent the driver to print the messages to syslog if debug is
> not set.
>
> Tested on Intel Atom E6xx and Eg20t Chipset.
>
> Signed-off-by: Andreas Werner <wernera...@gmx.de>
> ---
> drivers/i2c/busses/i2c-eg20t.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-eg20t.c
> b/drivers/i2c/busses/i2c-eg20t.c index 0f37529..b10c651 100644
> --- a/drivers/i2c/busses/i2c-eg20t.c
> +++ b/drivers/i2c/busses/i2c-eg20t.c
> @@ -322,7 +322,7 @@ static s32 pch_i2c_getack(struct i2c_algo_pch_data
> *adap) reg_val = ioread32(p + PCH_I2CSR) & PCH_GETACK;
>
> if (reg_val != 0) {
> - pch_err(adap, "return%d\n", -EPROTO);
> + pch_dbg(adap, "return%d\n", -EPROTO);
> return -EPROTO;
> }
I'd just kill the pch_err() line altogether:
if (reg_val)
return -EPROTO;
That is because if you look at the only caller of this function, which is
pch_i2c_wait_for_check_xfer(), you will see that at the only place where
pch_i2c_getack() is called there is already pch_dbg():
369 if (pch_i2c_getack(adap)) {
370 pch_dbg(adap, "Receive NACK for slave address"
371 "setting\n");
372 return -EIO;
373 }
btw. (idea for subsequent patch) this pch_dbg() should be fixed to be a one-
liner /wrt the text so we can grep for the error messages. Such text arg should
never be split in multiple lines in kernel.
Best regards,
Marek Vasut
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