From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: 2.6.18 - AHCI detection pauses excessively Date: Fri, 01 Dec 2006 22:59:07 +0900 Message-ID: <4570352B.9000704@gmail.com> References: <4557B7D2.2050004@gmail.com> <455B0BD7.20108@gmail.com> <455B5ADF.2040503@gmail.com> <20061127033550.GB11250@htj.dyndns.org> <456AA89C.909@gmail.com> <456D4B17.4080503@gmail.com> <456DD70D.1050808@gmail.com> <456FD4CB.8020608@gmail.com> <45702F9A.5020406@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from wr-out-0506.google.com ([64.233.184.238]:3227 "EHLO wr-out-0506.google.com") by vger.kernel.org with ESMTP id S936501AbWLAN7Y (ORCPT ); Fri, 1 Dec 2006 08:59:24 -0500 Received: by wr-out-0506.google.com with SMTP id i7so1194630wra for ; Fri, 01 Dec 2006 05:59:21 -0800 (PST) In-Reply-To: <45702F9A.5020406@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: "Berck E. Nash" Cc: "linux-kernel@vger.kernel.org" , "linux-ide@vger.kernel.org" Berck E. Nash wrote: > Hrm. It's not a Silicon Image chip, or at least doesn't claim to be: Yeap, the controller is ich ahci but I'm pretty sure there's a PMP chip connected to one of them. Look for 4723 in the following page. http://www.asus.com/products4.aspx?modelmenu=2&model=1198&l1=3&l2=11&l3=248 > 00:1f.2 SATA controller: Intel Corporation 82801GR/GH (ICH7 Family) > Serial ATA Storage Controller AHCI (rev 01) (prog-if 01 [AHCI 1.0]) > Subsystem: ASUSTeK Computer Inc. Unknown device 2606 > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- > ParErr- Stepping- SERR- FastB2B- > Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > SERR- Latency: 0 > Interrupt: pin B routed to IRQ 316 > Region 0: I/O ports at e400 [size=8] > Region 1: I/O ports at e080 [size=4] > Region 2: I/O ports at e000 [size=8] > Region 3: I/O ports at dc00 [size=4] > Region 4: I/O ports at d880 [size=16] > Region 5: Memory at febfb800 (32-bit, non-prefetchable) [size=1K] > Capabilities: [80] Message Signalled Interrupts: Mask- 64bit- > Queue=0/0 Enable+ > Address: fee0300c Data: 4179 > Capabilities: [70] Power Management version 2 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA > PME(D0-,D1-,D2-,D3hot+,D3cold-) > Status: D0 PME-Enable- DSel=0 DScale=0 PME- > > And, remember, this behavior started in 2.6.18 and didn't exist in > 2.6.17. Would it help if I narrowed down which patch caused it? Yeah, that's probably because we're now using IRQ-driven PIO for IDENTIFY, so we're often slower at detecting IDENTIFY failure. We're planning to go back to polling IDENTIFY. Anyways, the problem here is that the 4723 is emulating ATA device for configuration but it isn't doing it quite right. I'll ask SIMG about it. -- tejun