Hi Pierre-Louis
Thank you for your feedback
if (component->driver->probe) { ret = component->driver->probe(component); ... (A) WARN(...) } (B) WARN(...)
(snip)
This WARN() was added in 2012 by ff541f4b2a75 ('ASoC: core: giving WARN when device starting from non-off bias with idle_bias_off')
The commit message hints at an intentional check
" Just found some cases that some codec drivers set the bias to _STANDBY and set idle_bias_off to 1 during probing. It will cause unpaired runtime_get_sync/put() issue. Also as Mark suggested, there is no reason to start from _STANDBY bias with idle_bias_off == 1.
So here giving one warning when detected (dapm.idle_bias_off == 1) and (dapm.bias_level != SND_SOC_BIAS_OFF) just after driver->probe(). "
My take is that unless we can prove this is incorrect we leave it as is.
I think this commit is correct, thanks. But, then, it sounds we need to check it even though without .prove ?
Thank you for your help !! Best regards --- Kuninori Morimoto