Re: RME AES32 & MADI

From: Takashi Iwai <tiwai@suse.de>
To: Remy Bruno <remy.bruno@trinnov.com>
Cc: Winfried Ritsch <ritsch@iem.at>, alsa-devel@lists.sourceforge.net
Subject: Re: RME AES32 & MADI
Date: Fri, 02 Feb 2007 19:39:09 +0100	[thread overview]
Message-ID: <s5h3b5ojtf6.wl%tiwai@suse.de> (raw)
In-Reply-To: <20070131121148.GA20540@trinnov.com>

At Wed, 31 Jan 2007 13:11:48 +0100,
Remy Bruno wrote:
> 
> Hello,
> 
> I have been working on the AES32 and will soon provide a patch to get it
> (hopefully) fully operational (hdspm code).
> 
> Moreover, I also worked on the MADI card, but the original hdspm driver didn't
> work for me (ie the code before my modifications to support AES32). I had to
> deal with the following points:
>   - it needed the DDS feature (clock divisor), as for the AES32 and hdsp9632
>     cards (this may be a new behavior for recent cards)
>   - the channel map needed to always be channel_map_madi_ss (and never
>     channel_map_madi_ds, even at 96k), as for AES32. Otherwise, the routing was
>     not correct.
>   - not enough DMA memory was beeing allocated (only for
>     "params_channels(params)" channels whereas it should be allocated for all
>     the channels, otherwise it didn't work at 96kHz) (alsa-lib was complaining,
>     so I don't think an old MADI card would work either)
>   - I had to play with the channel and rate rules
>     (snd_hdspm_hw_rule_channels_rate and so on) to get it working. Not
>     completely clear to me how it works but it didn't work as it was
> 
> So here come my questions:
>   - Was the MADI driver completely fonctionnal before now? In other words,
>     maybe an older revision of the card was working as the code suggested (ie
>     differently than the revision I have, which is 204), can anyone confirm
>     this?

The early version has surely worked, IIRC.
But, Winfried should know better....

>   - As a corollary: should I keep the compatibility with the old code? IE keep
>     using channel_map_madi_ds, etc. for revisions < 204?

Well, the only question is whether it breaks the older models.

Takashi

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