Re: [PATCH] b44: power down PHY when interface down
- From: Michael Buesch <mb@xxxxxxxxx>
- Date: Sat, 30 Jun 2007 23:53:25 +0200
On Saturday 30 June 2007 13:47:35 Török Edvin wrote:
When the interface is down (or driver removed), the BroadCom 44xx card remains
powered on, and both its MAC and PHY is using up power.
This patch makes the driver issue a MAC_CTRL_PHY_PDOWN when the interface
is halted, and does a partial chip reset turns off the activity LEDs too.
Applies to 2.6.22-rc6, or current git head.
Tested on a Broadcom BCM4401-B0 card, it saves ~0.5W (measured using powertop).
Hm, I was going to measure the real power advantage with a
PCI-extender card. But my B44B0 card doesn't seem to work in
that extender card. It works perfectly fine sticked directly into
the motherboard, though, and other cards like a BCM4318 work in
the extender, too.
Not sure what this is.
The extender has an application note about nonworking cards in the
extender and a too big resistor on the board IDSEL pin being the
cause of this.
Maybe I can try with another machine tomorrow.
--
Greetings Michael.
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- References:
- [PATCH] b44: power down PHY when interface down
- From: Török Edvin
- [PATCH] b44: power down PHY when interface down
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