On Wed, Feb 24, 2010 at 04:17:15PM +0800, Takashi Iwai wrote: > At Wed, 24 Feb 2010 09:38:49 +0800, > Wu Fengguang wrote: > > > > From: "Zhang, Rui" <rui.zhang@xxxxxxxxx> > > > > This will save ~15ms boot time. > > > > The first 10ms sleep was introduced in commit d2595d86e5 for (buggy) > > Cxt codecs, so better to limit the sleep to the problem hardware. > > > > For the second 10ms sleep, the HDA spec says: > > > > Power State[1:0]: > > 00: Node Power state (D0) is fully on. > > 01: Node Power state (D1) allows for (does not require) the lowest possible power consuming state from which it > > can return to the "fully on" state (D0) within 10 ms, excepting analog pass through circuits (e.g., CD analog > > playback) which must remain fully on. > > 10: Node Power state (D2) allows for (does not require) the lowest possible power consuming state from which it > > can return to the "fully on" state (D0) within 10 ms. For modems, this is the "wake on ring" power state. > > 11: Node Power state (D3) allows for (does not require) lowest possible power consuming state under software > > control. Note that any low power state set by software must retain sufficient operational capability to properly > > respond to subsequent software Power State command. > > > > So 10ms is actually the max wait time. It should be safe to > > remove/reduce it and rely on the loop of 1ms-sleeps. > > > > CC: Marc Boucher <marc@xxxxxxxxxxxx> > > CC: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx> > > Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> > > Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> > > This delay might be needed for codecs of other vendors, but let's see... > If more codecs need this, we may put a flag into hda_codec struct. The first delay? OK let's see. Hopefully this won't break audio playback if there are similar broken hw.. > Anyway, I applied the patch with a minor compile warning fix now. Thank you! Regards, Fengguang _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
