linux-kernel - Re: [PATCH v4 2/2] irqchip/apple-aic: Add support for A7-A11 SoCs

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Date:   Sat, 8 Oct 2022 09:03:23 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, asahi@...ts.linux.dev,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] irqchip/apple-aic: Add support for A7-A11 SoCs



On 8.10.2022 01:17, Marc Zyngier wrote:
> On 2022-10-07 21:00, Konrad Dybcio wrote:
>> Add support for A7-A11 SoCs by if-ing out some features only present
>> on A11 & newer (implementation-defined IPI & UNCORE registers).
>>
>> Also, annotate IPI regs support in the aic struct so that the driver
>> can tell whether the SoC supports these, as they are written to,
>> even if fast IPI is disabled. This in turn causes a crash on older
>> platforms, as the implemention-defined registers either do
>> something else or are not supposed to be touched - definitely not a
>> NOP though.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
>> ---
>> Changes since v3:
>> - Replace use_fast_ipi with has_uncore_ipi_regs in aic_init_cpu
>> (logic error, this was written to regardless of FIPI usage before,
>> but touching Sn_... regs on SoCs that don't explicitly use them for
>> IPIs makes them sepuku..)
>> - Drop A11 compatible
>>
>>  drivers/irqchip/irq-apple-aic.c | 47 ++++++++++++++++++++++-----------
>>  1 file changed, 32 insertions(+), 15 deletions(-)
> 
> Since you cannot be bothered to read the review comments on
> the previous versions of this series, I'll do the same with
> these patches. Feel free to stop Cc-ing me.
> 
>         M.
I'm sorry, I'm working on a lot of stuff right now and I was almost sure
your email only concerned adding a cover letter and affirming the discussion
on the fallback compatible, so I did not go through it again - but that was
obviously incorrect. If you don't mind, I can respin another version of this
patchset, addressing your comments.

Konrad