N900 sleep mode (in 4.5-rc0, if that matters)

* Pavel Machek [off-list ref] [160130 14:16]:

Hi!

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ffdffe8d 48004a20 (fa004a20) cm_idlest1_core blocking bits: 00200072
0000000d 48004a28 (fa004a28) cm_idlest3_core

cm_idlest1_core changes periodicall often, to 00218072. The rest seems
constant.

For cm_idlest1_core 42 is the answer.. Here you have bits 4 and 5
blocking which is for OTG and it's PHY. That's a known issue with
musb and setting pm_runtime_irq_safe() on the MUSB parent.

If you do rmmod omap2430 and phy-twl4030usb chances are the LEDs will
start going off assuming the McSPI bit goes low with WLAN idling.

Ok, so I tried to compile kernel without omap2430/phy-twl4030usb
. That did not help. So I thought, ok, maybe rmmod is needed to
trigger some powersaving? But that is not exactly easy to do:

pavel at n900:/my/tui/ofone$ sudo insmod /my/modules/omap2430.ko
pavel at n900:/my/tui/ofone$ sudo insmod /my/modules/phy-twl4030-usb.ko
pavel at n900:/my/tui/ofone$ sudo rmmod phy-twl4030-usb.ko
Error: Module phy_twl4030_usb is in use
pavel at n900:/my/tui/ofone$

Any ideas what jumps to use the modules? Charger code?

I tried a kernel without charger code, and no luck, rmmod fails the
same way. dmesg says:
[  111.093078] wlan0: authenticated
[  111.097442] wlan0: associate with 06:27:22:f9:10:6a (try 1/3)
[  111.104553] wlan0: RX AssocResp from 06:27:22:f9:10:6a (capab=0x421
status=0 aid=2)
[  111.104705] wlan0: AP has invalid WMM params (AIFSN=1 for ACI 2),
will use 2
[  111.104736] wlan0: AP has invalid WMM params (AIFSN=1 for ACI 3),
will use 2
[  111.256652] wlan0: associated
[  184.681427] HS USB OTG: no transceiver configured
[  184.681488] musb-hdrc musb-hdrc.0.auto: musb_init_controller failed
with status -517
[  184.681976] HS USB OTG: no transceiver configured
[  184.682006] musb-hdrc musb-hdrc.0.auto: musb_init_controller failed
with status -517
[  187.690338] twl4030_usb 48070000.i2c:twl at 48:twl4030-usb:
Initialized TWL4030 USB module
[  187.698303] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk
combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[  187.698333] musb-hdrc: MHDRC RTL version 1.400
[  187.698333] musb-hdrc: setup fifo_mode 4
[  187.698394] musb-hdrc: 28/31 max ep, 16384/16384 memory
pavel at n900:/my/tui/ofone$

I added following hack to phy-twl4030-usb.c so that I could avoid
modules and module unloading problem. But still could not get it to
sleep :-(.

Are you sure you're using v4.5-rc? I recently patched away some
issues where rmmod of the musb related modules did not work.

Regards,

Tony