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

[The Source]

Takashi Iwai пишет:
> At Mon, 13 Oct 2008 23:21:47 +0400,
> Alexey Bazhin wrote:
>   
>> On Mon, 13 Oct 2008 18:05:49 +0200
>> Takashi Iwai <tiwai at suse.de> wrote:
>>
>>     
>>> At Mon, 13 Oct 2008 18:02:08 +0200,
>>> I wrote:
>>>       
>>>> At Mon, 13 Oct 2008 17:43:03 +0200,
>>>> I wrote:
>>>>         
>>>>> For example, the latest snapshot I uploaded now has
>>>>> alsa-kernel/HEAD: a3e1ef74a8ec8b6e3c30f7aa06c5d5d2f2bea7a9 Merge
>>>>> branch 'topic/sbxfi'
>>>>>           
>>>> ... and again updated to:
>>>>   5d425dd626d107ff2b2ea97c27068f7ee4b36dd1 Merge branch
>>>> 'topic/sbxfi'
>>>>         
>>> So, guys, please check the latest one.
>>>
>>> If the hang up still occurs with this version, then try to define
>>> XXX_SYSTEM_TIMER in sbxfi.c, which is undefined as default.
>>> With this build option, the driver will use the system timer instead
>>> of emu20k1 timer irqs.
>>>
>>> If this still doesn't help, try to remove all spinlocks.  That is,
>>> just comment out all spin_lock*() and spin_unlock*() calls to avoid
>>> spin deadlocks.  Of course, it can be racy, but better than a spin
>>> deadlock.
>>>       
>> Now it doesn't hangs :)
>>     
>
> Glad to hear.  Did you have to use XXX_SYSTEM_TIMER or any workaround
> needed?  Or, did it work as is?
>
>   
>> but speakers-test produces crackling sine and
>> fails on test...
>>     
>
> Do you mean it aborts some time later after starting the stream?
> Could you show the kernel messages?  The default debug level should
> suffice, I guess.  If any, try debug=2.
>
>   
>> root at mayonaka:~# speaker-test -c 2 -r 96000 -t
>> sine                                                                                                            
>>
>> speaker-test 1.0.15
>>
>> Playback device is default
>> Stream parameters are 96000Hz, S16_LE, 2 channels
>> Sine wave rate is 440.0000Hz
>> Rate set to 96000Hz (requested 96000Hz)
>> Buffer size range from 32 to 16384
>> Period size range from 32 to 16384
>> Using max buffer size 16384
>> Periods = 4
>> was set period_size = 4096
>> was set buffer_size = 16384
>>  0 - Front Left
>> Write error: -5,Input/output error
>> xrun_recovery failed: -5,Input/output error
>> Transfer failed: Operation not permitted
>>
>> Also i tried mplayer, 96khz works almost fine (very rare cracklings),
>> 48khz plays slow (like playing 96khz sample on 48khz rate without
>> resampling), 44.1khz doesn't work at all (mplayer doesn't even
>> show that it plays).
>>     
>
> How about the patch below for 48kHz?
>
> Not sure whether 44.1kHz works at all with the current driver code.
> I just guessed that the pitch parameter would handle that.  But, maybe
> it's not enough...
>
>   
>> Master control on mixer seems to be working fine.
>>     
>
> OK.
>
> [BTW, it'd be appreciated if you add my address to Cc (or, To: my
>  address and Cc: to ML like other people do), so that I can check your
>  post quickly.]
>
>
> thanks,
>
> Takashi
>
>
> diff --git a/sound/pci/sbxfi/sbxfi.c b/sound/pci/sbxfi/sbxfi.c
> index 3fde6a9..47ba941 100644
> --- a/sound/pci/sbxfi/sbxfi.c
> +++ b/sound/pci/sbxfi/sbxfi.c
> @@ -1005,7 +1005,8 @@ static void sbxfi_setup_play_pitch(struct sbxfi *chip,
>  	unsigned int pitch, pitch_ch;
>  
>  	/* convert to fixed-point 8.24 format */
> -	pitch = div_u64(runtime->rate * (1ULL << 24), chip->base_rate);
> +	/* pitch = div_u64(runtime->rate * (1ULL << 24), chip->base_rate); */
> +	pitch = div_u64(runtime->rate * (1ULL << 24), 96000);
>  
>  	for (i = 0; i < 2; i++) {
>  		/* write the pitch to param ring of the corresponsing SRC
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>   

Tried 96KHz sample (24bit, Little Endian, 96000Hz, Stereo). No crash, 
hang, reboot. oops, panic etc. But no sound too.