linux-kernel - Re: [PATCH] i2c-eg20t : Fix the issue of Combined R/W transfer mode

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Date:	Thu, 30 Jun 2011 10:16:59 +0200
From:	Christian Gmeiner <christian.gmeiner@...il.com>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Cc:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Qi Wang <qi.wang@...el.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, toshiharu-linux@....okisemi.com
Subject: Re: [PATCH] i2c-eg20t : Fix the issue of Combined R/W transfer mode

2011/6/23 Tomoya MORINAGA <tomoya-linux@....okisemi.com>:
> (2011/06/23 16:52), Alexander Stein wrote:
>>
>> Do you have any other local pending patches which are not in git yet? I
>> can't
>> find this for loop in current master.
>>
>
> I sent a patch for i2c-eg20t in 9-June which haven't been reviewed yet by
> i2c maintainer.
>

I have tried both patches, as I need combined R/W with i2c-eg20t to
work. I have some devices connected
on this bus, but I don't get them to work.

- lm75 probe failed
- at24 eeprom read failed
- i2cdetect works sometimes

I am using a Intel Corporation Platform Controller Hub EG20T I2C
Controller [8086:8817].


This happens, when I want to readout the eeprom:

[ 2222.113891] i2c i2c-0: master_xfer[0] W, addr=0x50, len=1
[ 2222.113906] i2c i2c-0: master_xfer[1] R, addr=0x50, len=128
[ 2222.113919] i2c_eg20t 0000:02:0c.2: pch_i2c_xfer
:adap->p_adapter_info->pch_i2c_suspended is 0
[ 2222.113931] i2c_eg20t 0000:02:0c.2: pch_i2c_xfer :After invoking
I2C_MODE_SEL :flag= 0x0
[ 2222.113941] i2c_eg20t 0000:02:0c.2: pch_i2c_xfer :invoking pch_i2c_writebytes
[ 2222.113957] i2c_eg20t 0000:02:0c.2: pch_i2c_writebytes :I2CCTL =
398 msgs->len = 1
[ 2222.134154] i2c_eg20t 0000:02:0c.2: pch_i2c_wait_for_bus_idle :I2CSR = 28
[ 2222.134171] i2c_eg20t 0000:02:0c.2: pch_i2c_start :I2CCTL = 398
[ 2222.184143] i2c_eg20t 0000:02:0c.2: pch_i2c_wait_for_xfer_complete
:timeout: 0
[ 2222.207152] i2c_eg20t 0000:02:0c.2: pch_i2c_stop :I2CCTL = 3b8
[ 2222.207185] at24 0-0050: read 128@0 --> -5 (1922207)
[ 2222.209093] i2c i2c-0: master_xfer[0] W, addr=0x50, len=1
[ 2222.209107] i2c i2c-0: master_xfer[1] R, addr=0x50, len=128
[ 2222.209118] i2c_eg20t 0000:02:0c.2: pch_i2c_xfer
:adap->p_adapter_info->pch_i2c_suspended is 0
[ 2222.209129] i2c_eg20t 0000:02:0c.2: pch_i2c_xfer :After invoking
I2C_MODE_SEL :flag= 0x0
[ 2222.209140] i2c_eg20t 0000:02:0c.2: pch_i2c_xfer :invoking pch_i2c_writebytes
[ 2222.209156] i2c_eg20t 0000:02:0c.2: pch_i2c_writebytes :I2CCTL =
398 msgs->len = 1
[ 2222.230144] i2c_eg20t 0000:02:0c.2: pch_i2c_wait_for_bus_idle :I2CSR = 28
[ 2222.230159] i2c_eg20t 0000:02:0c.2: pch_i2c_start :I2CCTL = 398
[ 2222.280142] i2c_eg20t 0000:02:0c.2: pch_i2c_wait_for_xfer_complete
:timeout: 0
[ 2222.303171] i2c_eg20t 0000:02:0c.2: pch_i2c_stop :I2CCTL = 3b8
[ 2222.303202] at24 0-0050: read 128@0 --> -5 (1922303)

I looks like I am running in timeouts.

--
Christian Gmeiner, MSc
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