Messages in this thread | | | Date | Fri, 12 Jan 2018 12:09:00 +0100 | From | Takashi Iwai <> | Subject | Re: [PATCH] ASoC: hdac_hdmi: Ensuring proper setting of output widget power state |
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On Fri, 12 Jan 2018 11:37:28 +0100, Kumar, Abhijeet wrote: > > > It's better, but doesn't guarantee that the node reached the given power state. codec_read assures that the verb is sent and the codec gives the response. But it means only the target state gets updated, and doesn't mean that the actual state reached. > > Thanks Takashi for replying. I guess, I should make use of return value from codec_read and retry if power state is not set properly! I'll make those changes and update again. And just wondering, how does hdmi_codec_prepare() and hdmi_codec_complete() gurantee while powering up and down the afg ?
There are two power states in the codec node: the target and the actual. By setting the power state, the target is set, but the actual state change may still take some time. In such a case, you'd need to wait until the actual state reaches. See hda_sync_power_state() in the hda legacy.
Takashi
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