linux-kernel - Re: Regressions: MSI vs HDA-Intel

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Message-ID: <s5hhbo26d68.wl%tiwai@suse.de>
Date:	Fri, 26 Mar 2010 21:27:59 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: Regressions: MSI vs HDA-Intel

At Fri, 26 Mar 2010 18:59:17 +0100,
Torsten Kaiser wrote:
> 
> On Fri, Mar 26, 2010 at 6:31 PM, Takashi Iwai <tiwai@...e.de> wrote:
> > At Fri, 26 Mar 2010 18:25:22 +0100,
> > Torsten Kaiser wrote:
> >>
> >> I have two systems that use the alsa hda-intel driver, both show
> >> regressions in relation to MSI.
> >>
> >> System 1: Athlon(tm) X2 BE-2400 with an AMD RS690/SB600 chipset
> >> 00:14.2 Audio device [0403]: ATI Technologies Inc SBx00 Azalia (Intel
> >> HDA) [1002:4383]
> >> (Mainboard is a MSI MS-7368)
> >>
> >> After upgrading from 2.6.31 to 2.6.33 I get a delay during bootup:
> >> [    1.155925] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level,
> >> low) -> IRQ 16
> >> [    1.159143] input: AT Translated Set 2 keyboard as
> >> /devices/platform/i8042/serio0/input/input2
> >> [    1.232595] firewire_core: created device fw0: GUID 00dc10000129c48f, S400
> >> [    1.252677] hda_codec: ALC888: BIOS auto-probing.
> >> [    1.259226] HDA Intel 0000:01:05.2: PCI INT B -> GSI 19 (level,
> >> low) -> IRQ 19
> >> [    1.260293] HDA Intel 0000:01:05.2: irq 27 for MSI/MSI-X
> >> [    1.314712] input: GenPS/2 Genius Mouse as
> >> /devices/platform/i8042/serio1/input/input3
> >> [    4.322508] hda-intel: azx_get_response timeout, switching to
> >> polling mode: last cmd=0x000f0000
> >> [    5.332508] hda-intel: No response from codec, disabling MSI: last
> >> cmd=0x000f0000
> >> [    6.342508] hda-intel: Codec #0 probe error; disabling it...
> >> [    7.392508] hda_intel: azx_get_response timeout, switching to
> >> single_cmd mode: last cmd=0x000f0000
> >> [    7.430464] ALSA device list:
> >> [    7.431549]   #0: HDA ATI SB at 0xfe7f4000 irq 16
> >> [    7.432656]   #1: HDA ATI HDMI at 0xfe9e8000 irq 27
> >>
> >> 2.6.34-rc2 does not boot on this system, something related to the new
> >> bootmem allocator, so I can't say if this might already be fixed for
> >> 2.6.34.
> >>
> >> Should the system be blacklisted like the two Asus Athlon X2 boards,
> >> or is this some other bug?
> >
> > If it happens on 2.6.33 and enable_msi=0 solves the issue, then yes,
> > we should put them on the blacklist.
> 
> Surprisingly this did not fix the delay. After all the trouble I had
> with MSI on the other system, I was sure it was related to the fact,
> that 2.6.33 tried to use MSI.
> 2.6.33 with snd_hda_intel.enable_msi=0:
> [    1.155712] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level,
> low) -> IRQ 16
> [    1.158852] input: AT Translated Set 2 keyboard as
> /devices/platform/i8042/serio0/in
> put/input2
> [    1.232597] firewire_core: created device fw0: GUID 00dc10000129c48f, S400
> [    1.252679] hda_codec: ALC888: BIOS auto-probing.
> [    1.259206] HDA Intel 0000:01:05.2: PCI INT B -> GSI 19 (level,
> low) -> IRQ 19
> [    1.314745] input: GenPS/2 Genius Mouse as
> /devices/platform/i8042/serio1/input/input3
> [    4.322508] hda-intel: azx_get_response timeout, switching to
> polling mode: last cmd=0x000f0000
> [    5.332508] hda-intel: Codec #0 probe error; disabling it...
> [    6.382508] hda_intel: azx_get_response timeout, switching to
> single_cmd mode: last cmd=0x000f0000
> [    6.420470] ALSA device list:
> [    6.421545]   #0: HDA ATI SB at 0xfe7f4000 irq 16
> [    6.422628]   #1: HDA ATI HDMI at 0xfe9e8000 irq 19
> 
> ... if I had read these messages, instead of just copy&pasting them, I
> could have noted, that the delay is from codec *0*, but MSI gets
> enabled for codec *1*.
> Info about the HDMI output:
> 01:05.2 Audio device [0403]: ATI Technologies Inc Radeon X1200 Series
> Audio Controller [1002:7919]
> 
> But that is a clear bug in the alsa code: After codec 0 (the
> integrated audio from the SB600) does not responds, it disables the
> MSI support for codec 1 (part of the intregrated graphic chipset).
> (I don't know if the HDMI audio support is working or not, as I do not
> have an HDMI display I could attach there.)

It's no bug.  The driver has only one flag to use MSI or not.
So it disable MSI for both.  It's on the same board, after all,
so better to take a safer option.


> 2.6.31 was working without the delay:
> [    0.930754] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level,
> low) -> IRQ 16
> [    0.946676] input: AT Translated Set 2 keyboard as
> /devices/platform/i8042/serio0/input/input2
> [    1.031402] hda_codec: Unknown model for ALC888, trying auto-probe
> from BIOS...
> [    1.035263] HDA Intel 0000:01:05.2: PCI INT B -> GSI 19 (level,
> low) -> IRQ 19
> [    1.090754] input: GenPS/2 Genius Mouse as
> /devices/platform/i8042/serio1/input/input3
> [    1.102573] firewire_core: created device fw0: GUID 00dc10000129c48f, S400
> [    1.112916] ALSA device list:
> [    1.112974]   #0: HDA ATI SB at 0xfe7f4000 irq 16
> [    1.113033]   #1: HDA ATI HDMI at 0xfe9e8000 irq 19
> 
> 
> >> System 2: Opteron(tm) 2218 with an nVidia MCP55 chipset
> >> 00:06.1 Audio device [0403]: nVidia Corporation MCP55 High Definition
> >> Audio [10de:0371] (rev a2)
> >> (Mainboard is an ASUS KFN5-D SLI)
> >>
> >> Commit 80c43ed724797627d8f86855248c497a6161a214 disabled MSI for this
> >> system, but the MSI mode was working fine for all 2.6.33 versions I
> >> used.
> >>
> >> Should the generic blacklist disable MSI for all Athlon X2 instead of
> >> all nNvidia chipsets?
> >
> > Well, it's not clear yet.  I don't bet that non-athlon would have
> > any problem.  So I keep it still disabled for Nvidia controllers.
> > You can put it in the whitelist instead.
> 
> OK, just wanted to let you know, that there are MCP55 out there that
> do work with MSI. :-)

That's fine.  There must be some other positive boards .
But I don't want to give more and more bug reports just because
of buggy MSI support.  That's enough in a single version number :)
The gain by MSI isn't so much in most cases.


Takashi
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