On Mon, Nov 02, 2015 at 09:18:55AM +0000, Charles Keepax wrote: > On Mon, Nov 02, 2015 at 04:44:04PM +0800, Zidan Wang wrote: > > Hi Mark, > > > > In wm8960 codec driver, suspend_bias_off has been enabled. So when system suspend, the wm8960 codec will go to bias off, > > it will disable VMID and VREF, then sleep 600ms. It seems that 600ms is too long for system suspend. > > > > Because the wm8960 datasheet don't mentioned the sleep time, so i want to check with you if we can shorten the sleep time. > > I can't say that I am explicit familiar with the required delay > there, but the comment in the code says that we are letting VMID > and VREF discharge, which I certainly could believe would take a > while. My guess would be that we likely weren't super excited > about putting a 600mS delay in, which probably means it was > necessary for some reason. > > How much where you hoping to reduce it by? I can see if I can > find a hardware engineer who still remembers enough about the > part to discuss it with. > Some customer can't accept such long system suspend time. It's better to spend less than 100ms for system suspend. Codec suspend is a part of system suspend, so it should be less than 100ms, and as short as possible. Best Regards, Zidan Wang > Thanks, > Charles _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
