Ajay, On Fri, 2021-12-24 at 16:20 +0000, Ajay.Kathat@xxxxxxxxxxxxx wrote: > On 23/12/21 22:38, David Mosberger-Tang wrote: > > First, on a freshly booted system and with wilc1000-spi autoloaded by > > the kernel, try this sequence (copy & paste the commands): > > > > /usr/sbin/wpa_supplicant -Bs -iwlan0 -c/etc/wpa_supplicant.conf > > sleep 10 > > iw dev wlan0 set power_save on > > > > The above yields a power consumption of 1.4W reliably. The "sleep 10" > > doesn't matter here; the behavior is the same with or without it. I > > tried waiting up to 120 seconds with no difference. > > I have tested by making the WILC as build-in module to insert driver > automatically at boot-up. I hope it should be fine. Because I have > already tested as loadable module earlier. > > Below are the number observed > ------------------------------ -------------------------- > - before starting wpa_supplicant : ~16.3 mA > - wpa_supplicant started : ~40 mA > - PSM on : ~6 mA > > > The 'sleep 10' would have no impact in my setup because I have measured > the current consumption for wilc1000 chip. > > I have shared the screenshot at https://postimg.cc/67S41dkb Huh, that's curious. I definitely cannot reproduce this. To match your setup as closely as possibly, I also built wilc1000-spi into the kernel, but that makes no difference (as expected). What kernel version are you on? I switched to wireless-drivers-next as of today (latest commit d430dffbe9dd30759f3c64b65bf85b0245c8d8ab). With this kernel, the numbers are about 100mW lower than reported before, but the relative behavior is the same: about 300mW higher power-consumption when PSM is not taking effect properly. To recap, back with wilc1000-spi being a module again, after freshly booting the system and issuing this commands: /usr/sbin/wpa_supplicant -Bs -iwlan0 -c/etc/wpa_supplicant.conf /usr/sbin/iw dev wlan0 set power_save on I see a power-consumption of about 1.25W. PSM on/off makes no difference in this state. Then, if I issue the commands: rmmod wilc1000-spi modprobe wilc1000-spi sleep 10 iw dev wlan0 set power_save on power-consumption drops to about 0.9W. Here is a screenshot that shows the annotated power-measurements: https://postimg.cc/3dbKSGht Apart from kernel version, the only things that I can think of that'd be different is that we don't have the ENABLE pin wired to a GPIO. Instead, the chip is always enabled. I doubt this would explain the difference (~RESET is wired to a GPIO). --david
