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  7. 24 Feb, 2010 1 commit
    • Zhang, Rui's avatar
      ALSA: hda - remove unnecessary msleep on power state transitions · dd2b4a7a
      Zhang, Rui authored
      This will save ~15ms boot time.
      
      The first 10ms sleep was introduced in commit d2595d86
      
       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@linuxant.com>
      CC: Arjan van de Ven <arjan@linux.intel.com>
      Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
      Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      dd2b4a7a
  8. 23 Feb, 2010 4 commits
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