From: Sergei Shtylyov <sergei.shtylyov-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
To: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>,
linux-kernel-81qHHgoATdFT9dQujB1mzip2UmYkHbXO@public.gmane.org
Cc: Simon Horman
<horms+renesas-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>,
Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 3/6] i2c: rcar: do not print error if device nacks transfer
Date: Sat, 10 May 2014 02:55:00 +0400 [thread overview]
Message-ID: <536D5CC4.6030209@cogentembedded.com> (raw)
In-Reply-To: <536CA0B1.4040300-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
Hello.
On 05/09/2014 01:32 PM, Ben Dooks wrote:
>>> The i2c-rcar driver currently prints an error message if the master_xfer
>>> callback fails. However if the bus is being probed then lots of NAKs
>>> will be generated, causing the output of a number of errors printed.
>>> To solve this, disable the print if the error is not -EREMOTEIO.
>>> An example of running i2cdetect:
>>> 10: i2c-rcar e6530000.i2c: error -121 : 15
>>> -- i2c-rcar e6530000.i2c: error -121 : 15
>>> -- 12 i2c-rcar e6530000.i2c: error -121 : 15
>>> -- i2c-rcar e6530000.i2c: error -121 : 15
>>> -- i2c-rcar e6530000.i2c: error -121 : 15
>>> -- i2c-rcar e6530000.i2c: error -121 : 15
>>> -- i2c-rcar e6530000.i2c: error -121 : 15
>>> -- i2c-rcar e6530000.i2c: error -121 : 15
>>> Cc: Simon Horman <horms+renesas-/R6kz+dDXgpPR4JQBCEnsQ@public.gmane.org>
>>> Cc: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
>>> Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>>> Cc: linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>>> Signed-off-by: Ben Dooks <ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
>>> ---
>>> drivers/i2c/busses/i2c-rcar.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>> diff --git a/drivers/i2c/busses/i2c-rcar.c
>>> b/drivers/i2c/busses/i2c-rcar.c
>>> index 2c2fd7c..0d25104 100644
>>> --- a/drivers/i2c/busses/i2c-rcar.c
>>> +++ b/drivers/i2c/busses/i2c-rcar.c
>>> @@ -623,7 +623,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter
>>> *adap,
>>>
>>> pm_runtime_put(dev);
>>>
>>> - if (ret < 0)
>>> + if (ret < 0 && ret != -EREMOTEIO)
>>> dev_err(dev, "error %d : %x\n", ret, priv->flags);
>> Hm, I'm now getting -EBUSY and -EAGAIN running i2cdetect on R8A7791
>> base Henninger board. Only when I comment out the above 2 lines, I can
>> get the bus scanned, otherwise I don't see any devices at all.
> i2c-detect does not work well on the i2c-rcar due to it insisting
> on sending or receiving at-least one byte of data.
I've noticed that it works more or less reliable only the first time I run
it, on subsequent runs it only sees devices for which a driver is bound, IIRC.
> I think it
> is possible that it confuses some of the bus devices.
Yes, it seems to be the case. However, with these lines commented out, it
still works the first time...
WBR, Sergei
next prev parent reply other threads:[~2014-05-09 22:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1390752337-22386-1-git-send-email-ben.dooks@codethink.co.uk>
[not found] ` <1390752337-22386-1-git-send-email-ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
2014-01-26 16:05 ` [PATCH 3/6] i2c: rcar: do not print error if device nacks transfer Ben Dooks
[not found] ` <1390752337-22386-4-git-send-email-ben.dooks-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
2014-01-26 21:50 ` Wolfram Sang
2014-02-16 9:46 ` Wolfram Sang
2014-02-16 10:25 ` Geert Uytterhoeven
2014-02-16 11:46 ` Wolfram Sang
2014-02-17 8:04 ` Ben Dooks
2014-05-08 22:03 ` Sergei Shtylyov
[not found] ` <536BFF39.40607-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@public.gmane.org>
2014-05-09 5:04 ` Wolfram Sang
2014-05-09 9:32 ` Ben Dooks
[not found] ` <536CA0B1.4040300-4yDnlxn2s6sWdaTGBSpHTA@public.gmane.org>
2014-05-09 22:55 ` Sergei Shtylyov [this message]
2014-01-26 16:05 ` [PATCH 5/6] i2c: update i2c_algorithm documentation Ben Dooks
2014-01-26 16:05 ` [PATCH 4/6] i2c: rcar: use devm_clk_get to ensure clock is properly ref-counted Ben Dooks
2014-01-26 16:05 ` [PATCH 6/6] i2c: rcar: fix NACK error code Ben Dooks
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