linux-kernel - Re: Unwanted delayed execution of

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Message-ID: <2027555.2ZAulqKXKg@xps13>
Date:	Fri, 06 Mar 2015 13:42:21 +0100
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	"Zheng, Lv" <lv.zheng@...el.com>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Mario Limonciello <Mario_Limonciello@...l.com>
Subject: Re: Unwanted delayed execution of _Qxx EC methods

On Friday 06 March 2015 01:52:48 Zheng, Lv wrote:
> Hi, Gabriele
> 
> 
> I couldn't find this in my mail box, but saw it in the spinics.net.
> 
> For EC query, there is no spec definitions around its behavior.
> Some EC firmware will have events queued (like edge triggering) while the others will keeps on reporting events when a condition is set (like level triggering).
> I think this case is a "level triggering like events", it is very useful for us to learn.
> We should be able to handle both firmware variations using one software architecture.
> Supporting this becomes possible now because we are able to switch EC handling between polling/interrupt modes using enhanced ACPICA GPE APIs.
> So we are able to switch EC into polling mode when SCI_EVT is detected and blocks further events and handles all transactions in polling mode.
> After completing the _Qxx evaluation we then can switch back to the interrupt mode and unblock further events.
> 
> Could you please open a kernel Bugzilla entry at: https://bugzilla.kernel.org
> So we can discuss there with more test cases considered.
> 
> Thanks and best regards
> -Lv

Hi,

thanks for the explanation.

I opened a bug report as requested, here the address:
https://bugzilla.kernel.org/show_bug.cgi?id=94411

Regards,
Gabriele

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