[PATCH -next 0/4] Add LCLK control into Aspeed LPC sub drivers

[Jae Hyun Yoo]

On 11/2/2021 5:22 AM, Corey Minyard wrote:
> On Mon, Nov 01, 2021 at 11:36:38PM +0000, Joel Stanley wrote:
>> On Mon, 1 Nov 2021 at 23:18, <jae.hyun.yoo at intel.com> wrote:
>>>
>>> From: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
>>>
>>> Hello all,
>>>
>>> This series is for appliying below fix to all Aspped LPC sub drivers.
>>> https://lore.kernel.org/all/20201208091748.1920-1-wangzhiqiang.bj@bytedance.com/
>>>
>>> An LPC sub driver can be enabled without using the lpc-ctrl driver or it
>>> can be registered ahead of lpc-ctrl depends on each system configuration and
>>> this difference introduces that LPC can be enabled without heart beating of
>>> LCLK so it causes improper handling on host interrupts when the host sends
>>> interrupts in that time frame. Then kernel eventually forcibly disables the
>>> interrupt with dumping stack and printing a 'nobody cared this irq' message
>>> out.
>>>
>>> To prevent this issue, all LPC sub drivers should enable LCLK individually
>>> so this patch adds clock control logic into the remaining Aspeed LPC sub
>>> drivers.
>>
>> Thanks for sending this out!
>>
>> This will resolve a few of the issues we have in the issue tracker:
>>
>> https://github.com/openbmc/linux/issues/210
>> https://github.com/openbmc/linux/issues/130
>>
>> The patches look good to me. I think you've just missed Corey's PR for
>> v5.16, but I will stick them in the openbmc tree once they've had a
>> review.
> 
> We can still get them in to 5.16 if it's important for that; this is a
> bug fix, after all, and it's early.  I just need to know the urgency.
> 
> Get the Reviewed-by's in and add the bindings and I can get it into the
> next tree for a bit, then I can submit.  We may be in rc1 by then, but
> that's ok.

Thanks Corey! I'll submit v2 soon.

Jae

> 
> -corey
> 
>>
>> Cheers,
>>
>> Joel
>>
>>>
>>> Please review this series.
>>>
>>> Thanks,
>>> Jae
>>>
>>> Jae Hyun Yoo (4):
>>>    ARM: dts: aspeed: add LCLK setting into LPC IBT node
>>>    ipmi: bt: add clock control logic
>>>    ARM: dts: aspeed: add LCLK setting into LPC KCS nodes
>>>    ipmi: kcs_bmc_aspeed: add clock control logic
>>>
>>>   arch/arm/boot/dts/aspeed-g4.dtsi   |  1 +
>>>   arch/arm/boot/dts/aspeed-g5.dtsi   |  5 +++++
>>>   arch/arm/boot/dts/aspeed-g6.dtsi   |  5 +++++
>>>   drivers/char/ipmi/bt-bmc.c         | 24 ++++++++++++++++++++++-
>>>   drivers/char/ipmi/kcs_bmc_aspeed.c | 31 ++++++++++++++++++++++++++----
>>>   5 files changed, 61 insertions(+), 5 deletions(-)
>>>
>>> --
>>> 2.25.1
>>>