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From: bugzilla-daemon@bugzilla.kernel.org
To: linuxppc-dev@lists.ozlabs.org
Subject: [Bug 199471] [Bisected][Regression] windfarm_pm* no longer gets
 automatically loaded when CONFIG_I2C_POWERMAC=y is set
Date: Sun, 01 Mar 2020 19:46:12 +0000
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Message-ID: <bug-199471-206035-zBUmo8uSE3@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=3D199471

--- Comment #11 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Wolfram Sang from comment #8)
> "This has been quite nice since 4.?.x up to 4.16.x as you only need
> CONFIG_I2C_POWERMAC=3Dy which selects the proper windfarm_pmXX at boot ti=
me."
>=20
> I can't find that in the code. Are you sure i2c-powermac requested that
> module?
I guess so 'cause if I build i2c_powermac as a module and manually modprobe=
 it,
all the relevant windfarm modules get pulled in. But not before.

 # modprobe -v i2c_powermac
insmod
/lib/modules/4.16.18-PowerMacG5+/kernel/drivers/i2c/busses/i2c-powermac.ko=
=20
 # dmesg | tail
[  150.181478]  11
[  150.182851]  0
[  150.184220]  0

[  150.626685] windfarm: Backside control loop started.
[  150.690132] windfarm: Slots control loop started.
[  150.794843] i2c i2c-0: master_xfer[0] W, addr=3D0x50, len=3D1
[  150.796467] i2c i2c-0: master_xfer[1] R, addr=3D0x50, len=3D8
[  150.801851] i2c i2c-0: NAK from device addr 0x50 msg #0
[  150.807758] windfarm: Drive bay control loop started.

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