On Tue, Dec 03, 2019 at 03:31:05PM +0800, Brent Lu wrote: > For platforms not able to provide WCLK in the PREPARED runtime state, it > takes 400ms for codec driver to print the message "SRM failed to lock" in > the da7219_dai_event() function which is called when DAPM widgets are > powering up. The latency penalty to audio input/output is too much so the > retry (8 times) and delay (50ms each retry) are removed. > Another reason is current Cold output latency requirement in Android CDD is > 500ms but will be reduced to 200ms for 2021 platforms. With the 400ms > latency it would be difficult to pass the Android CTS test. Adam pointed out some specific problems this causes here but at a higher level this commit message isn't great since it just says "I don't like these delays so I made them shorter" which doesn't really explain what the delays are doing or why it's OK to make them shorter - there are plenty of audio devices which require longer ramp times than people would like out there but there's usually good solid reasons why the delays have to be there.
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