[alsa-devel] Backported sbxfi driver (UNTESTED!)

William Pitcock nenolod at sacredspiral.co.uk
Sat Oct 11 20:04:02 CEST 2008


On Sat, 2008-10-11 at 19:41 +0200, Takashi Iwai wrote:
> Could you build with XXX_CONST_TIMER defined?  This will disable the
> adaptive timer-resolution handling I added to the driver, which
> doesn't
> exist in OSS sbxfi code at all.

No change in behaviour. It survives a little longer, but then the system
hardlocks... without me even touching the keyboard even.

> > Noise is now on the right channel only.
> Does it mean that the left channel plays normally as expected?
> Also, which sample rate are you using?  I'm curious whether the sample
> rate tracking is correct...

No. The left channel is silent.

> > It might make more sense to poll for the DAC reset in the interrupt
> > handler. I have noticed that the card generates an interrupt request
> in
> > Windows once the DAC is online.
> Interesting...  Maybe putting some debug prints in interrupt handler
> and else would help a bit for more understanding.
> > Something leads me to believe that the DMA mask is 32 bits, but
> given
> > that the behaviour is similar in both instances, I am unsure.
> This isn't a critical issue right now.  It can be figured out safely
> later.

I am now actually 100% positive the DMA mask is 32 bits.

By the way, it's an original X-Fi in this case (I have others to test
with). lspci -vvv gives us:

05:01.0 Multimedia audio controller: Creative Labs SB X-Fi
	Subsystem: Creative Labs Device 0021
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 32 (1000ns min, 1250ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at d200 [size=32]
	Region 1: Memory at f0000000 (64-bit, non-prefetchable) [size=2M]
	Region 3: Memory at ec000000 (64-bit, non-prefetchable) [size=64M]
	Capabilities: [40] 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-
	Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
		Address: 0000000000000000  Data: 0000

Kernel is:
Linux version 2.6.27 (nenolod at petrie) (gcc version 4.2.4 (Debian 4.2.4-2
+b1)) #1 SMP Sat Oct 11 11:59:08 CDT 2008

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