[alsa-devel] [PATCH 3/7] ASoC: WM8903: Handle micdet_cfg more safely

Mark Brown broonie at opensource.wolfsonmicro.com
Fri Feb 11 19:09:03 CET 2011

On Fri, Feb 11, 2011 at 09:29:06AM -0800, Stephen Warren wrote:

> Strangely, modifying wm8903_mic_detect() to:

> * Unconditionally clear MICDET_ENA
> * Update the IRQ mask like it does today
> * Re-enable MICDET_ENA if det||shrt

> Doesn't actually solve the problem. I guess disabling MICDET_ENA doesn't
> actually reset the mic detection state machine.

That's kind of what I expect - remember that the microphone detection
interrupst doesn't report the microphone status directly, they report
deltas in the reported microphone status after debouncing.

> Anyway, as you said, perhaps just documenting how to set up micdet_cfg
> in the platform_data header is indeed the best way, since everything
> works without any code changes if I simply don't set MICDET_ENA in
> micdet_cfg.

Yes, and it's not a particularly useful thing to do so I'm pretty
comfortable just telling people not do do that.

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