Re: Re: What's up with the Embedded Controller driver? [was Re: [ACPI] patched sms-cm acpi/ec.c to 2.6.11.5]

[Rich Townsend <rhdt-OBnUx95tOyn10jlvfTC4gA@public.gmane.org>]

I've tried the patch from the osdl.org website on a number of occasions,
and also a variant of the patch created by Dmitry Torokhov (IIRC).
Always, I get similar problems to the other guys: the EC takes around a
minute to initialize at boot, and access to the smart battery system
(via the EC-hosted SMBus) is painfully slow. Why might this be
happening? And what can be done to fix it?

cheers,

Rich

Yu, Luming wrote:
> Do you try latest acpi testing patch?
> It includes patch filed at http://bugme.osdl.org/show_bug.cgi?id=3851
> 
> 
> Thanks
> Luming 
> 
> 
>>-----Original Message-----
>>From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org 
>>[mailto:acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of 
>>Fran?ois Valenduc
>>Sent: 2005年3月24日 3:35
>>To: Rich Townsend
>>Cc: Pedro Venda; acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>>Subject: [ACPI] Re: What's up with the Embedded Controller 
>>driver? [was Re: [ACPI] patched sms-cm acpi/ec.c to 2.6.11.5]
>>
>>
>>
>>>>>it does NOT seem ok. after some more tests with the patch, I found 
>>>>>out that francois was right about most of the problems:
>>>>>* timeout on boot, just after the boot loader. this is very 
>>>>>confusing to me...
>>>>>* when I plug in the battery, it takes ages to show information 
>>>>>about it... more than 1 minute.
>>>>>* about the usb problems, apparently I wasn't affected.
>>>>>
>>>>>could you please tip us about what could be causing these delays? 
>>>>>especially the boot delay... it really puzzles my mind.
>>>>>
>>>>>regards,
>>>>>pedro venda.
>>>>>
>>>>>
>>>>
>>>>Concerning USB problems, I think it happens because I tried 
>>
>>the patch 
>>
>>>>with the 2.6.11 kernel. I have retried with the 2.6.11.5 and there 
>>>>are no more USB problems. But all the other problems remains. 
>>>>Concerning the timeout on boot, could it be caused by the 
>>>>acpi-dsdt-initrd patch made by Markus Gaugausch. Maybe we 
>>
>>should try 
>>
>>>>other ways to incorporate the DSDT to the kernel.
>>>>François Valenduc
>>>
>>>
>>>I doubt it is the DSDT patch; rather, it looks like 
>>
>>something has gone 
>>
>>>wrong in the embedded controller driver in going from 2.6.10 to 
>>>2.6.11.  I've tried out a number of different ways of fixing 
>>
>>ec event 
>>
>>>handling, including my own spinlock kludge and Pedro's 
>>
>>version of it, 
>>
>>>and also a series of patches by Dmitry Torokhov; but all of 
>>
>>them seem 
>>
>>>to have problems with very sluggish EC response and/or EC timeouts 
>>>(indicated by "Handler for [EmbeddedControl] returned AE_TIME").
>>>
>>>Who currently maintains ec.c? And what exactly has been done to it 
>>>since 2.6.10?
>>>
>>>cheers,
>>>
>>>Rich
>>>
>>>
>>
>>Just by curiosity I tried the DSDT patches without applying 
>>any patch on 
>>the ec.c file and I don't notice any problem yet. I choose for 
>>a static 
>>DSDT override and there doesn't seem to be any slowdown of my 
>>computer. 
>>If I have well understood I could see "Handler for [EmbeddedControl] 
>>returned AE_TIME" appearing in kernel messages but it doesn't appear. 
>>Maybe I am very lucky!
>>
>>François
>>
>>
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