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Author Topic: Codec sleep, saving power when idle  (Read 4125 times)

Offline dreamlayers

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Codec sleep, saving power when idle
« on: March 31, 2009, 11:25:23 AM »
On my 5G 30GB iPod, audiohw_close() (which puts the codec chip to sleep) saves about 7.5 mA.  More could probably be saved by shutting down some related hardware.  Of course, you can only do this when not playing or recording audio.  Is this a desirable feature?

If idle power consumption is reduced via this and other means, the end result could be similar to original firmware's sleep mode.  You could simply set an extremely long idle power-down time.
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Offline saratoga

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Re: Codec sleep, saving power when idle
« Reply #1 on: March 31, 2009, 01:24:31 PM »
I think at very least it would be nice to have the codec off when music isn't playing, even if we don't have a proper sleep mode.
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Offline soap

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Re: Codec sleep, saving power when idle
« Reply #2 on: May 04, 2009, 09:49:27 PM »
Desirable feature x10!
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Offline Chronon

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Re: Codec sleep, saving power when idle
« Reply #3 on: May 04, 2009, 10:07:28 PM »
+1 for codec sleep!
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Offline Hillshum

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Re: Codec sleep, saving power when idle
« Reply #4 on: May 05, 2009, 11:16:44 AM »
Do most targets have such hardware that could be shut off when unused?
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Offline LambdaCalculus

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Re: Codec sleep, saving power when idle
« Reply #5 on: May 05, 2009, 11:29:36 AM »
It's mostly the unused hardware in the iPods that we can do this with, but I'm sure there are other targets with hardware currently unused by Rockbox that we can do this with (Gigabeast?)

Also, +1 for codec sleep!
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Offline Hillshum

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Re: Codec sleep, saving power when idle
« Reply #6 on: May 05, 2009, 11:35:54 AM »
Also, do we know if the Broadcom video chip is using power?
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Offline saratoga

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Re: Codec sleep, saving power when idle
« Reply #7 on: May 06, 2009, 11:22:24 AM »
Quote from: Hillshum on May 05, 2009, 11:35:54 AM
Also, do we know if the Broadcom video chip is using power?

Did you see this?

FS#9890 - iPod 5G: LCD sleep, BCM shutdown and bootstrap
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Offline torne

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Re: Codec sleep, saving power when idle
« Reply #8 on: June 27, 2009, 08:31:20 AM »
7.5mA seems like a pretty worthwhile improvement: my ipod draws only 25mA when idle with the LCD disabled, so cutting another 7.5 is indeed edging closer and closer to being able to leave it turned on :)
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some kind of ARM guy. ipodvideo/gigabeat-s/h120/clipv2. to save time let's assume i know everything.

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