[Libreboot-dev] bisect rtc_cmos x200 bug

[arthur]

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Hi

I did a bisect on linux-git to find what is causing the inability to read
the rtc_cmos of thinkpad x200 on recent kernels.
The first bad commit is 3c217e51d8a272b9301058fe845d6c69cc0651cb "rtc:
cmos: century support"


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git bisect start
# bad: [1993b176a8224e371e0732ffada7ab9eb3b0912b] Merge 
git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide
git bisect bad 1993b176a8224e371e0732ffada7ab9eb3b0912b
# good: [64291f7db5bd8150a74ad2036f1037e6a0428df2] Linux 4.2
git bisect good 64291f7db5bd8150a74ad2036f1037e6a0428df2
# bad: [6a13feb9c82803e2b815eca72fa7a9f5561d7861] Linux 4.3
git bisect bad 6a13feb9c82803e2b815eca72fa7a9f5561d7861
# good: [807249d3ada1ff28a47c4054ca4edd479421b671] Merge branch 'upstream' of 
git://git.linux-mips.org/pub/scm/ralf/upstream-linus
git bisect good 807249d3ada1ff28a47c4054ca4edd479421b671
# good: [26f5d7609f03ad8d6dc552458e4e371a62416b37] list_lru: don't call 
list_lru_from_kmem if the list_head is empty
git bisect good 26f5d7609f03ad8d6dc552458e4e371a62416b37
# bad: [fadb97b089563da69ba326f9fea6399d071462b2] Merge branch 
'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad fadb97b089563da69ba326f9fea6399d071462b2
# bad: [daf0e1ed578f65e8395102549e135887e6661860] Merge tag 'for_linus' of 
git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
git bisect bad daf0e1ed578f65e8395102549e135887e6661860
# bad: [3af6e98f25d1f68b9c36beee330342944a4e0048] Merge tag 
'platform-drivers-x86-v4.3-1' of 
git://git.infradead.org/users/dvhart/linux-platform-drivers-x86
git bisect bad 3af6e98f25d1f68b9c36beee330342944a4e0048
# good: [d9241b22b58e012f26dd2244508d9f4837402af0] Merge branch 'misc' of 
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
git bisect good d9241b22b58e012f26dd2244508d9f4837402af0
# bad: [5f1b2f77646fc0ef2f36fc554f5722a1381d0892] rtc: abx80x: fix RTC write bit
git bisect bad 5f1b2f77646fc0ef2f36fc554f5722a1381d0892
# bad: [c472d7ded2dfbe7da29531a9c9e6b951e5658605] rtc: ds1742: clean up 
ds1742_nvram_read()/ds1742_nvram_write()
git bisect bad c472d7ded2dfbe7da29531a9c9e6b951e5658605
# good: [a17ccd1c6a327e5b468358e8352a6af004261473] rtc: switch wakealarm 
attribute to DEVICE_ATTR_RW
git bisect good a17ccd1c6a327e5b468358e8352a6af004261473
# good: [8918bd8a5f6c37963ba04ae79ad6488108894ab9] rtc: at91sam9: get sclk rate 
after enabling it
git bisect good 8918bd8a5f6c37963ba04ae79ad6488108894ab9
# bad: [a3781639e148497d7381d8786aaefe9f8b7e3028] rtc: cmos: clean up 
cmos_nvram_read()/cmos_nvram_write()
git bisect bad a3781639e148497d7381d8786aaefe9f8b7e3028
# good: [202cc98acf96de1c3897194e1ed5ae1c80c8b0f3] rtc: gemini: fix 
ptr_ret.cocci warnings
git bisect good 202cc98acf96de1c3897194e1ed5ae1c80c8b0f3
# bad: [3c217e51d8a272b9301058fe845d6c69cc0651cb] rtc: cmos: century support
git bisect bad 3c217e51d8a272b9301058fe845d6c69cc0651cb
# good: [11f67a8bbf65872c3e9edc70242420a8c314a860] rtc: at91rm9200: get and use 
slow clock
git bisect good 11f67a8bbf65872c3e9edc70242420a8c314a860
# first bad commit: [3c217e51d8a272b9301058fe845d6c69cc0651cb] rtc: cmos: 
century support

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Hope someone can figure out a fix.

Kind regards

Arthur Heymans

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