linux-kernel - Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq

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Message-ID: <7c47ce67-88ee-9cba-3356-a530b0d3e657@gmail.com>
Date:   Wed, 9 Feb 2022 18:48:24 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Chris Brandt <chris.brandt@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        linux-rpi-kernel <linux-rpi-kernel@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to
 get the interrupt

On 2/9/22 6:18 PM, Arnd Bergmann wrote:
> On Wed, Feb 9, 2022 at 4:11 PM Sergei Shtylyov
> <sergei.shtylyov@...il.com> wrote:
>>
>> On 2/8/22 3:31 PM, Arnd Bergmann wrote:
>>
>> [...]
>>>>> I might have missed something, but it seems the only user of IRQ 0 on
>>>>> SuperH is smsc911x Ethernet in arch/sh/boards/board-apsh4a3a.c and
>>>>> arch/sh/boards/board-apsh4ad0a.c, which use evt2irq(0x200).
>>>>> These should have been seeing the "0 is an invalid IRQ number"
>>>>> warning splat since it was introduced in commit a85a6c86c25be2d2
>>>>> ("driver core: platform: Clarify that IRQ 0 is invalid"). Or not:
>>>>
>>>>     Warning or no warning, 0 is still returned. :-/
>>>>     My attempt to put an end to this has stuck waiting a review from the IRQ
>>>> people...
>>>
>>> I had another look at this after you asked about it on IRC. I don't
>>> know much SH assembly, but I suspect IRQ 0 has not been delivered

   Neither do I, sigh...
   I do know the instuctions are 16-bit and so there are no immediate
opperands... :-)

>>> since 2009 after 1e1030dccb10 ("sh: nmi_debug support."). On a
>>
>>    Mhm... this commit changes the SH3 code while SH778x are SH4A, no?
> 
> This code is shared between both:
> 
> arch/sh/kernel/cpu/sh4/Makefile:common-y        += $(addprefix
> ../sh3/, entry.o ex.o)

   Ah, quite convoluted! :-)
   So you mean thet broke the delivery of EVT 0x200 when mucking with NMI?

>        Arnd

MBR, Sergey