[PATCH v3] powerpc/g5: Enable all windfarms by default

[PATCH v3] powerpc/g5: Enable all windfarms by default

[Linus Walleij]

The G5 defconfig is clearly intended for the G5 Powermac
series, and that should enable all the available
windfarm drivers, or the machine will overheat a short
while after booting and shut itself down, which is
annoying.

Signed-off-by: Linus Walleij <linusw@kernel.org>
---
I wonder why this never gets applied. Am I doing something wrong?
Is the patch stupid? No-one cares?
---
Changes in v3:
- Rebased on v7.1-rc1
- Link to v2: https://lore.kernel.org/r/20260120-powermac-g5-config-v2-1-cd8f1c8bfbae@kernel.org

Changes in v2:
- Rebased on v6.19-rc1
- Link to v1: https://lore.kernel.org/r/20251205-powermac-g5-config-v1-1-8609aa97c1c0@kernel.org

To: Madhavan Srinivasan <maddy@linux.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>
To: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
---
 arch/powerpc/configs/g5_defconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/configs/g5_defconfig b/arch/powerpc/configs/g5_defconfig
index 04bbb37f5978..f74ccc06f4c1 100644
--- a/arch/powerpc/configs/g5_defconfig
+++ b/arch/powerpc/configs/g5_defconfig
@@ -85,6 +85,8 @@ CONFIG_PMAC_SMU=y
 CONFIG_MAC_EMUMOUSEBTN=y
 CONFIG_WINDFARM=y
 CONFIG_WINDFARM_PM81=y
+CONFIG_WINDFARM_PM72=y
+CONFIG_WINDFARM_RM31=y
 CONFIG_WINDFARM_PM91=y
 CONFIG_WINDFARM_PM112=y
 CONFIG_WINDFARM_PM121=y

---
base-commit: 254f49634ee16a731174d2ae34bc50bd5f45e731
change-id: 20251205-powermac-g5-config-69128e93d584

Best regards,
--  
Linus Walleij <linusw@kernel.org>

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Michael Ellerman]

On 6/5/2026 04:47, Linus Walleij wrote:
> The G5 defconfig is clearly intended for the G5 Powermac
> series, and that should enable all the available
> windfarm drivers, or the machine will overheat a short
> while after booting and shut itself down, which is
> annoying.
> 
> Signed-off-by: Linus Walleij <linusw@kernel.org>
> ---
> I wonder why this never gets applied. Am I doing something wrong?
> Is the patch stupid? No-one cares?

Sorry it didn't get picked up.

I don't have any G5s anymore, but the ones I did have used the other 
windfarm drivers so I never hit this.

You might be the last person on earth booting Linux on those :)

> ---
> Changes in v3:
> - Rebased on v7.1-rc1
> - Link to v2: https://lore.kernel.org/r/20260120-powermac-g5-config-v2-1-cd8f1c8bfbae@kernel.org
> 
> Changes in v2:
> - Rebased on v6.19-rc1
> - Link to v1: https://lore.kernel.org/r/20251205-powermac-g5-config-v1-1-8609aa97c1c0@kernel.org
> 
> To: Madhavan Srinivasan <maddy@linux.ibm.com>
> To: Michael Ellerman <mpe@ellerman.id.au>
> To: Nicholas Piggin <npiggin@gmail.com>
> To: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-kernel@vger.kernel.org
> ---
>   arch/powerpc/configs/g5_defconfig | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/powerpc/configs/g5_defconfig b/arch/powerpc/configs/g5_defconfig
> index 04bbb37f5978..f74ccc06f4c1 100644
> --- a/arch/powerpc/configs/g5_defconfig
> +++ b/arch/powerpc/configs/g5_defconfig
> @@ -85,6 +85,8 @@ CONFIG_PMAC_SMU=y
>   CONFIG_MAC_EMUMOUSEBTN=y
>   CONFIG_WINDFARM=y
>   CONFIG_WINDFARM_PM81=y
> +CONFIG_WINDFARM_PM72=y
> +CONFIG_WINDFARM_RM31=y
>   CONFIG_WINDFARM_PM91=y
>   CONFIG_WINDFARM_PM112=y
>   CONFIG_WINDFARM_PM121=y
> 

Ack, LGTM.

Maddy can you pick this one up for next?

cheers

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Linus Walleij]

On Wed, May 6, 2026 at 1:41 PM Michael Ellerman <mpe@kernel.org> wrote:

> I don't have any G5s anymore, but the ones I did have used the other
> windfarm drivers so I never hit this.
>
> You might be the last person on earth booting Linux on those :)

Not really, Sean (Action Retro) did this thing and follow-ups on
YouTube:
https://www.youtube.com/watch?v=g-Ugfqj1ank

Including installing a contemporary graphics card:
https://www.youtube.com/watch?v=WPDd1Y0flSg

This likely means he inspired a whole bunch of geeks to
go and do the same. :)

Yours,
Linus Walleij

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Madhavan Srinivasan]

On 5/6/26 5:11 PM, Michael Ellerman wrote:
> On 6/5/2026 04:47, Linus Walleij wrote:
>> The G5 defconfig is clearly intended for the G5 Powermac
>> series, and that should enable all the available
>> windfarm drivers, or the machine will overheat a short
>> while after booting and shut itself down, which is
>> annoying.
>>
>> Signed-off-by: Linus Walleij <linusw@kernel.org>
>> ---
>> I wonder why this never gets applied. Am I doing something wrong?
>> Is the patch stupid? No-one cares?
>
> Sorry it didn't get picked up.
>
> I don't have any G5s anymore, but the ones I did have used the other 
> windfarm drivers so I never hit this.
>
> You might be the last person on earth booting Linux on those :)
>
>> ---
>> Changes in v3:
>> - Rebased on v7.1-rc1
>> - Link to v2: 
>> https://lore.kernel.org/r/20260120-powermac-g5-config-v2-1-cd8f1c8bfbae@kernel.org
>>
>> Changes in v2:
>> - Rebased on v6.19-rc1
>> - Link to v1: 
>> https://lore.kernel.org/r/20251205-powermac-g5-config-v1-1-8609aa97c1c0@kernel.org
>>
>> To: Madhavan Srinivasan <maddy@linux.ibm.com>
>> To: Michael Ellerman <mpe@ellerman.id.au>
>> To: Nicholas Piggin <npiggin@gmail.com>
>> To: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
>> Cc: linuxppc-dev@lists.ozlabs.org
>> Cc: linux-kernel@vger.kernel.org
>> ---
>>   arch/powerpc/configs/g5_defconfig | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/powerpc/configs/g5_defconfig 
>> b/arch/powerpc/configs/g5_defconfig
>> index 04bbb37f5978..f74ccc06f4c1 100644
>> --- a/arch/powerpc/configs/g5_defconfig
>> +++ b/arch/powerpc/configs/g5_defconfig
>> @@ -85,6 +85,8 @@ CONFIG_PMAC_SMU=y
>>   CONFIG_MAC_EMUMOUSEBTN=y
>>   CONFIG_WINDFARM=y
>>   CONFIG_WINDFARM_PM81=y
>> +CONFIG_WINDFARM_PM72=y
>> +CONFIG_WINDFARM_RM31=y
>>   CONFIG_WINDFARM_PM91=y
>>   CONFIG_WINDFARM_PM112=y
>>   CONFIG_WINDFARM_PM121=y
>>
>
> Ack, LGTM.
>
> Maddy can you pick this one up for next?

Sure will do.
Thanks.


>
> cheers
>

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Madhavan Srinivasan]

On 5/6/26 11:00 PM, Linus Walleij wrote:
> On Wed, May 6, 2026 at 1:41 PM Michael Ellerman <mpe@kernel.org> wrote:
>
>> I don't have any G5s anymore, but the ones I did have used the other
>> windfarm drivers so I never hit this.
>>
>> You might be the last person on earth booting Linux on those :)
> Not really, Sean (Action Retro) did this thing and follow-ups on
> YouTube:
> https://www.youtube.com/watch?v=g-Ugfqj1ank
>
> Including installing a contemporary graphics card:
> https://www.youtube.com/watch?v=WPDd1Y0flSg
>
> This likely means he inspired a whole bunch of geeks to
> go and do the same. :)
Interesting and good to know. Thanks for the links
Maddy


> Yours,
> Linus Walleij
>

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Segher Boessenkool]

On Wed, May 06, 2026 at 09:41:51PM +1000, Michael Ellerman wrote:
> Sorry it didn't get picked up.
> 
> I don't have any G5s anymore,

I don't have any functioning ones either :-(

> but the ones I did have used the other
> windfarm drivers so I never hit this.

Yeah, the oldest PowerMac G5 and RackMac were not super big sellers
either, relatively to the newer models.  And of course all Apple
hardware of the time (as well as all by other manufacturers) had failing
power supplies, so there "naturally" be fewer working machines over\
time.  Problems that solve themselves!

> You might be the last person on earth booting Linux on those :)

Booting, yes, but it won't run for even a minute ;-)

> > diff --git a/arch/powerpc/configs/g5_defconfig b/arch/powerpc/configs/g5_defconfig
> > index 04bbb37f5978..f74ccc06f4c1 100644
> > --- a/arch/powerpc/configs/g5_defconfig
> > +++ b/arch/powerpc/configs/g5_defconfig
> > @@ -85,6 +85,8 @@ CONFIG_PMAC_SMU=y
> >   CONFIG_MAC_EMUMOUSEBTN=y
> >   CONFIG_WINDFARM=y
> >   CONFIG_WINDFARM_PM81=y
> > +CONFIG_WINDFARM_PM72=y
> > +CONFIG_WINDFARM_RM31=y
> >   CONFIG_WINDFARM_PM91=y
> >   CONFIG_WINDFARM_PM112=y
> >   CONFIG_WINDFARM_PM121=y
> > 
> 
> Ack, LGTM.
> 
> Maddy can you pick this one up for next?

Is this all supported models?  Might be better to do that immediately,
not wait for patches to trickle in over the years :-)

Thanks everyone!


Segher

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Linus Walleij]

On Thu, May 7, 2026 at 10:53 AM Segher Boessenkool
<segher@kernel.crashing.org> wrote:
> On Wed, May 06, 2026 at 09:41:51PM +1000, Michael Ellerman wrote:

> > You might be the last person on earth booting Linux on those :)
>
> Booting, yes, but it won't run for even a minute ;-)

Yeah what I think happen with Debian (which works) is that they have
this driver in the initramfs or rootfs as a module so it gets probed soon
enough, but it feels way safer to compile in vital stuff like this.

Yours,
Linus Walleij

Re: [PATCH v3] powerpc/g5: Enable all windfarms by default

[Michael Ellerman]

On 7/5/2026 03:30, Linus Walleij wrote:
> On Wed, May 6, 2026 at 1:41 PM Michael Ellerman <mpe@kernel.org> wrote:
> 
>> I don't have any G5s anymore, but the ones I did have used the other
>> windfarm drivers so I never hit this.
>>
>> You might be the last person on earth booting Linux on those :)
> 
> Not really, Sean (Action Retro) did this thing and follow-ups on
> YouTube:
> https://www.youtube.com/watch?v=g-Ugfqj1ank
> 
> Including installing a contemporary graphics card:
> https://www.youtube.com/watch?v=WPDd1Y0flSg

Nice.

But the driver you enabled, PM72, is for PowerMac7,2, which is 2-3 years 
older, and does not have PCI-E.
So if you have one of those it's even more special.

 > This likely means he inspired a whole bunch of geeks to
 > go and do the same. :)

Hopefully one of them volunteers to be powermac maintainer ;)

cheers