linux-kernel - Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

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Date:	Sat, 23 Aug 2008 19:05:05 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"David Witbrodt" <dawitbro@...global.net>
Cc:	"Rufus & Azrael" <rufus-azrael@...ericable.fr>,
	"Linux-kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

On Sat, Aug 23, 2008 at 4:42 PM, David Witbrodt <dawitbro@...global.net> wrote:
>
>
>> please check v3
>>
>> deviceid should be 0x4385 instead.
>
> Yinghai!
>
> You did it!  The kernel boots without "hpet=disable" or any other
> workaround...

good

>
> (BTW, just what kernel version were you using for those patches?  The
> v2.6.27-rcX series place the patch's changes over 100 lines earlier
> than the line numbers indicated in your patches....)

we are working on tip/master

>
> In case you want it, here is the output you have usually asked for:
> =============================
>
> $ dmesg
> Linux version 2.6.27-rc4.080823.hpet+bar1+v3 (dawitbro@...eserver) (gcc version 4.3.1 (Debian 4.3.1-2) ) #1 SMP Sat Aug 23 19:23:53 EDT 2008
> Command line: root=/dev/hda1 ro video=uvesafb:1280x1024-16@60,mtrr:3 fbcon=scrollback:256k,font:10x18 debug initcall_debug
> KERNEL supported cpus:
>  Intel GenuineIntel
>  AMD AuthenticAMD
>  Centaur CentaurHauls

> 00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 13)
>    Subsystem: Elitegroup Computer Systems Device 2621
>    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
>    Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>    Region 0: I/O ports at fa00 [size=16]
>    Region 1: Memory at fed00000 (32-bit, non-prefetchable) [size=1K]
>    Capabilities: <access denied>
>    Kernel driver in use: piix4_smbus
> 00: 02 10 85 43 03 04 30 02 13 00 05 0c 00 00 80 00
> 10: 01 fa 00 00 00 00 d0 fe 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 21 26
> 30: 00 00 00 00 b0 00 00 00 00 00 00 00 00 00 00 00

kernel leave the BAR1 untouched ...

>
> $ cat /proc/timer_list | grep -B1 -A5 hpet
> Tick Device: mode:     1
> Clock Event Device: hpet
>  max_delta_ns:   149983003520
>  min_delta_ns:   3352
>  mult:           61496115
>  shift:          32
>  mode:           1
>  next_event:     9223372036854775807 nsecs
>  set_next_event: hpet_legacy_next_event
>  set_mode:       hpet_legacy_set_mode
>  event_handler:  tick_handle_oneshot_broadcast
> tick_broadcast_mask: 00000000
> tick_broadcast_oneshot_mask: 00000000
>

hpet works.

YH
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