linux-kernel - Re: [PATCH] sh: avoid using IRQ0 on SH3/4

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Date:   Fri, 11 Feb 2022 23:46:30 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Rich Felker <dalias@...c.org>, <linux-sh@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH] sh: avoid using IRQ0 on SH3/4

On 2/11/22 11:30 PM, John Paul Adrian Glaubitz wrote:

[...]
>>> Using IRQ0 by the platform devices is going to be disallowed soon (see [1])
>>> and the code supporting SH3/4 SoCs maps the IRQ #s starting at 0 -- modify
>>> that code to start the IRQ #s from 16 instead.
>>>
>>> [1] https://lore.kernel.org/all/5e001ec1-d3f1-bcb8-7f30-a6301fd9930c@omp.ru/
>>>
>>> Signed-off-by: Sergey Shtylyov <s.shtylyov@....ru>
>>>
>>> ---
>>> The patch is against Linus Torvalds' 'linux.git' repo.
>>>
>>>  arch/sh/kernel/cpu/sh3/entry.S |    4 ++--
>>>  include/linux/sh_intc.h        |    6 +++---
>>>  2 files changed, 5 insertions(+), 5 deletions(-)
>>>
>>> Index: linux/arch/sh/kernel/cpu/sh3/entry.S
>>> ===================================================================
>>> --- linux.orig/arch/sh/kernel/cpu/sh3/entry.S
>>> +++ linux/arch/sh/kernel/cpu/sh3/entry.S
>>> @@ -470,9 +470,9 @@ ENTRY(handle_interrupt)
>>>  	mov	r4, r0		! save vector->jmp table offset for later
>>>  
>>>  	shlr2	r4		! vector to IRQ# conversion
>>> -	add	#-0x10, r4
>>>  
>>> -	cmp/pz	r4		! is it a valid IRQ?
>>> +	mov	#0x10, r5
>>> +	cmp/ge	r5, r4		! is it a valid IRQ?
>>
>>    Maybe I should've used cmp/hs... my 1st try at SH assembly! :-)

   Yeah, cmp/hs seems m ore correct as we don't subtract any more...

> I can test your revised patch next week on my SH7785LCR.

   Please do, although testing on the AP-SH4A* bords would be a bit more
interesting, as they actually use IRQ0 for the SMSC911x chip...
   Maybe you have SH7786 base board, by chance? 

> Thanks,
> Adrian

MBR, Sergey