[alsa-devel] [PATCH 00/11] Intel HDMI fixes

Takashi Iwai tiwai at suse.de
Sun Nov 15 16:54:57 CET 2009

At Sun, 15 Nov 2009 19:32:19 +0800,
Wu Fengguang wrote:
> Hi Takashi,
> Here is some Intel HDMI fixes, most of them are inspired/written by
> David Härdeman (Big thanks!).
> - fix audio infoframe size
> - sticky infoframe/stream id/channel count to
>   - not disturb (David's) fragile devices
>   - avoid the first 0.5s audio samples be losted
> - avoid losing presence info during
>   - module reloading (by querying the pin sense status)
>   - power off (by disabling it)

Thanks for the patches!

Most of them look good; however, I'm not much convinced wrt the
disablement of power-saving.  In many cases, the power-saving is more 
important than 0.5sec drop-out (particularly if it's already fixed in
the succeeding playbacks).  Thus disabling the power-saving
unconditionally is no good idea.

Maybe some flag, either an option or a mixer control, would be
preferred for defining the behavior, as a compromise...

Also, it'd be more readable if we define another common jack
detection routine that calls the pin sense function, such as

int snd_hda_jack_detect(struct hda_codec *codc, hda_nid_t nid)
	u32 sense = snd_hda_pin_sense(codec, nid);
	return !!(sense & AC_PINSENSE_PRESENCE);

since all callers check only that bit.

Last but not least, don't forget to add comment to each new common
function.  Although it's trivial, the documentation is always better
to have :)



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