Hi Ivo, On Wed, 9 Jan 2008 12:08:28 +0100, Ivo Manca wrote: > Trying to test interrupt support for i801 I learned that somehow > between kernel version 2.6.22.14 and 2.6.23.9, something went wrong > with the bus driver. Is this a known issue?
No, you are the first person to report this problem as far as I know. > When I try to use i2cdump to block-read an EEP OM, my i2cbus hangs. What is an "EEP OM"? Please note that EEPROMs typically want I2C block reads (mode "i" of i2cdump) and not SMBus block reads. Using the wrong mode shouldn't hang the bus though. > Please find my output for 2.6.19-1 (working), 2.6.22.14-72 (working) > and 2.6.23.9-85 (not working). > > Note: SMBus: Intel Corporation 82801EB/ER (ICH5/ICH5R) > > Ivo > > [EMAIL PROTECTED] ~]# uname -r > 2.6.19-1.2911.fc6 > > [EMAIL PROTECTED] ~]# modprobe i2c-dev > [EMAIL PROTECTED] ~]# i2cdetect -y 0 > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: XX XX XX XX XX 08 XX XX XX XX XX XX XX > 10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 40: XX XX XX XX 44 XX XX XX XX XX XX XX XX XX XX XX > 50: 50 XX XX XX 54 55 XX XX XX XX XX XX XX XX XX XX > 60: XX XX XX XX XX XX XX XX XX 69 XX XX XX XX XX XX > 70: XX XX XX 73 XX XX XX XX > > [EMAIL PROTECTED] ~]# i2cdump -y 0 0x55 s > 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef > 00: 08 07 0d 0a 01 40 00 04 60 70 00 82 08 00 01 0e [EMAIL PROTECTED] > 10: 04 0c 01 02 20 c0 75 70 00 00 48 30 48 2a 40 75 ???? [EMAIL PROTECTED] > > [EMAIL PROTECTED] ~]# i2cdump -y 0 0x55 s > 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef > 00: 08 07 0d 0a 01 40 00 04 60 70 00 82 08 00 01 0e [EMAIL PROTECTED] > 10: 04 0c 01 02 20 c0 75 70 00 00 48 30 48 2a 40 75 ???? [EMAIL PROTECTED] > > ==== > > [EMAIL PROTECTED] ~]# uname -r > 2.6.22.14-72.fc6 > > [EMAIL PROTECTED] ~]# modprobe i2c-dev > > [EMAIL PROTECTED] ~]# i2cdetect -y 0 > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: XX XX XX XX XX 08 XX XX XX XX XX XX XX > 10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX > 40: XX XX XX XX 44 XX XX XX XX XX XX XX XX XX XX XX > 50: 50 XX XX XX 54 55 XX XX XX XX XX XX XX XX XX XX > 60: XX XX XX XX XX XX XX XX XX 69 XX XX XX XX XX XX > 70: XX XX XX 73 XX XX XX XX > > [EMAIL PROTECTED] ~]# i2cdump -y 0 0x55 s > 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef > 00: 08 07 0d 0a 01 40 00 04 60 70 00 82 08 00 01 0e [EMAIL PROTECTED] > 10: 04 0c 01 02 20 c0 75 70 00 00 48 30 48 2a 40 75 ???? [EMAIL PROTECTED] > > [EMAIL PROTECTED] ~]# i2cdump -y 0 0x55 s > 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef > 00: 08 07 0d 0a 01 40 00 04 60 70 00 82 08 00 01 0e [EMAIL PROTECTED] > 10: 04 0c 01 02 20 c0 75 70 00 00 48 30 48 2a 40 75 ???? [EMAIL PROTECTED] So 2.6.22 works as good as 2.6.19 did, right? > > ==== > > [EMAIL PROTECTED] ~]# uname -r > 2.6.23.9-85.fc8 > > [EMAIL PROTECTED] ~]# modprobe i2c-dev > > [EMAIL PROTECTED] ~]# i2cdetect -y 0 > 0 1 2 3 4 5 6 7 8 9 a b c d e f > 00: -- -- -- -- -- 08 -- -- -- -- -- -- -- > 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- > 40: -- -- -- -- 44 -- -- -- -- -- -- -- -- -- -- -- > 50: 50 -- -- -- 54 55 -- -- -- -- -- -- -- -- -- -- > 60: -- -- -- -- -- -- -- -- -- 69 -- -- -- -- -- -- > 70: -- -- -- 73 -- -- -- -- I note that this version of i2cdetect is more recent than the one you used when testing 2.6.19-1.2911.fc6 and 2.6.22.14-72.fc6 kernels. I suppose that this is the case for i2cdump as well... To make sure that this is really an i2c-i801 driver issue and not a user-space issue, can you please try again using the exact same version of i2cdetect and i2cdump? > > [EMAIL PROTECTED] ~]# i2cdump -y 0 0x55 s > Error: Block read failed, return code -1 > > [EMAIL PROTECTED] ~]# i2cdump -y 0 0x55 s > Error: Block read failed, return code -1 > > (i2c Bus hangs completely, poweroff needed.) Note that i2cdump relies on i2c-dev, so the problem could be in i2c-dev. There were changes to i2c-dev between 2.6.22 and 2.6.23, that affect I2C block reads, but not SMBus block reads. There were two large patches applied to i2c-i801: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ca8b9e32a11a7cbfecbef00c8451a79fe1af392e http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7edcb9abb594a8f3b4ca756e03d01c870aeae127 You may also want to check what fedora-specific patches your kernels include for i2c-i801 and i2c-dev, if any. Can you reproduce the problem with a vanilla 2.6.23.12 kernel? On my side I'll check if I can reproduce the problem on one of my test systems. I don't test SMBus block reads very often so I could have missed it. -- Jean Delvare _______________________________________________ i2c mailing list [email protected] http://lists.lm-sensors.org/mailman/listinfo/i2c
