Hi, On Thu, Mar 10, 2011 at 10:27:06AM +0000, ext kalle.jokiniemi@xxxxxxxxx wrote: > > On Thu, Mar 10, 2011 at 12:00:45PM +0200, Kalle Jokiniemi wrote: > > > I'm currently working on fixing the power management issues in N900 > > > MeeGo release. There is one big power consumer occurring which is the > > > ISP1707 USB tranceiver. It is taking ~14mA power all the time > > > regardless of cable being plugged in the device or not. > > > > > > I got the problem fixed with following patch in the MeeGo 2.6.37 based > > > kernel, but the same fix does not seem to help with upstream linux-usb. > > > > > > Do you have any ideas why it did not work, or how we could make the > > > suspending work in upstream linux-usb? > > > > No ideas, sorry. But when you say that it doesn't work, what do you mean? > > Did you very the bit got written ? What happens to power consumption ? > > Never drops ? > > The power consumption never dropped. Did not check any registers, I'm not > too familiar with the musb driver. But I'll put in some debug code to see how > the suspend bit is set. I don't know why the isp1707 does not go into low power mode in this case, but on RX51 the CHIP_SEL pin is connected to a gpio. I would use that always when there is no need for USB (cable unplugged or dedicated charger). By disabling the chip select it will go into power off mode and consume even less then in low power mode. -- heikki -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
