linux-kernel - Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

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Date:	Fri, 17 Nov 2006 00:36:10 +0100
From:	Olivier Nicolas <olivn@...llprod.org>
To:	"Lu, Yinghai" <yinghai.lu@....com>
CC:	Linus Torvalds <torvalds@...l.org>, Mws <mws@...sted-brains.org>,
	Jeff Garzik <jeff@...zik.org>,
	Krzysztof Halasa <khc@...waw.pl>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, tiwai@...e.de
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

Lu, Yinghai wrote:
> Add pci_intx to diable intx could make MSI work with pci.
> 
> Olivier, Please test it attached patch with latest git ... I hardcode to
> make enable_msi=1.
> 
> YH
> 

The kernel boots only with pci=routeirq, no IRQ get disabled but the 
sound driver does not work.


http://olivn.trollprod.org/19-rc6/19-rc6-yinghai1-routeirq.dmesg
http://olivn.trollprod.org/19-rc6/19-rc6-yinghai1-routeirq.irq



In order to get reproductible result, I halt the system and remove the 
power cord for 30 seconds.But once, I just reboot and get that strange 
result

IRQ 22 is disabled but snd_hda_intel seems to get a MSI interrupt! (It 
cannot be reproduced)

http://olivn.trollprod.org/19-rc5-git7-patch1.dmesg

           CPU0       CPU1
   0:        614    1107801   IO-APIC-edge      timer
   1:          2        361   IO-APIC-edge      i8042
   6:          0          5   IO-APIC-edge      floppy
   8:          0          0   IO-APIC-edge      rtc
   9:          0          0   IO-APIC-fasteoi   acpi
  12:          0        163   IO-APIC-edge      i8042
  14:         10      11446   IO-APIC-edge      ide0
  16:          0          3   IO-APIC-fasteoi   libata, ohci1394
  17:          4          8   IO-APIC-fasteoi   bttv0
  20:          2         22   IO-APIC-fasteoi   ehci_hcd:usb2
  21:          0          4   IO-APIC-fasteoi   libata, ohci_hcd:usb1
  22:         15      99985   IO-APIC-fasteoi   libata
  23:         30       7639   IO-APIC-fasteoi   libata
307:        156     443303   PCI-MSI-edge      eth1
308:          0        311   PCI-MSI-edge      eth1
309:          0        401   PCI-MSI-edge      eth1
310:        156     443333   PCI-MSI-edge      eth0
311:          0          0   PCI-MSI-edge      eth0
312:          0          0   PCI-MSI-edge      eth0
313:          0          1   PCI-MSI-edge      HDA Intel
NMI:         65         47
LOC:    1108404    1108429
ERR:          0




Olivier

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