Re: [alsa-devel] [PATCH v3 4/5] ASoC: tda998x: adjust the audio hw parameters from EDID

On Wed, 05 Feb 2014 10:19:22 +0100 Lars-Peter Clausen lars@metafoo.de wrote:

...

So, in the CODEC, I don't see how I could update the parameters dictated by the EDID otherwise in changing the DAI driver parameters.

The startup function is the right place. But instead of modifying the DAI use snd_pcm_hw_constraint_mask64(), snd_pcm_hw_constraint_list(), etc. to setup the additional constraints that come from the EDID.

It is more complicated, but it works. Nevertheless, I have 2 problems:

- snd_pcm_hw_constraint_list() keeps a pointer to the list, so, it cannot be in the stack. It fix this with static struct and rate array.

- snd_pcm_hw_constraint_mask64() is not exported. Is there an other way to set constraints on the formats/sample widths?