linux-kernel - Re: [PATCH] sh: hd64461: fix virq offsets

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Message-ID: <2c57d9cc03b6a430234c0016bf78fa22@artur-rojek.eu>
Date:   Sun, 09 Jul 2023 14:56:47 +0200
From:   Artur Rojek <contact@...ur-rojek.eu>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@....ru>, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: hd64461: fix virq offsets

On 2023-07-09 14:48, John Paul Adrian Glaubitz wrote:
> Hi Artur!
> 
> On Sun, 2023-07-09 at 14:13 +0200, Artur Rojek wrote:
>> A recent change to start counting SuperH IRQ #s from 16 breaks support
>> for the Hitachi HD64461 companion chip.
>> 
>> Move the offchip IRQ base and HD64461 IRQ # by 16 in order to
>> accommodate for the new virq numbering rules.
>> 
>> Fixes: a8ac2961148e ("sh: Avoid using IRQ0 on SH3 and SH4")
>> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
>> ---
>>  arch/sh/cchips/Kconfig        | 4 ++--
>>  arch/sh/include/asm/hd64461.h | 2 +-
>>  2 files changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/arch/sh/cchips/Kconfig b/arch/sh/cchips/Kconfig
>> index efde2edb5627..9659a0bc58de 100644
>> --- a/arch/sh/cchips/Kconfig
>> +++ b/arch/sh/cchips/Kconfig
>> @@ -29,9 +29,9 @@ endchoice
>>  config HD64461_IRQ
>>  	int "HD64461 IRQ"
>>  	depends on HD64461
>> -	default "36"
>> +	default "52"
>>  	help
>> -	  The default setting of the HD64461 IRQ is 36.
>> +	  The default setting of the HD64461 IRQ is 52.
>> 
>>  	  Do not change this unless you know what you are doing.
>> 
>> diff --git a/arch/sh/include/asm/hd64461.h 
>> b/arch/sh/include/asm/hd64461.h
>> index afb24cb034b1..6d85db6cf54b 100644
>> --- a/arch/sh/include/asm/hd64461.h
>> +++ b/arch/sh/include/asm/hd64461.h
>> @@ -229,7 +229,7 @@
>>  #define	HD64461_NIMR		HD64461_IO_OFFSET(0x5002)
>> 
>>  #define	HD64461_IRQBASE		OFFCHIP_IRQ_BASE
>> -#define	OFFCHIP_IRQ_BASE	64
>> +#define	OFFCHIP_IRQ_BASE	80
>>  #define	HD64461_IRQ_NUM		16
>> 
>>  #define	HD64461_IRQ_UART	(HD64461_IRQBASE+5)
> 
> I think it would be better to write this as (64 + 16) for consistency
> with the other changes made by Sergey.
Sure, I will send v2 with this change, although the same can't be
applied to HD64461_IRQ value above, so some inconsistency will exist
either way.
> 
> Adrian