linux-kernel - Re: [PATCH v2 14/20] mips: Use offset-sized IO-mem accessors in CPS debug printout

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Date:   Wed, 6 May 2020 22:52:46 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        <linux-mips@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 14/20] mips: Use offset-sized IO-mem accessors in CPS
 debug printout

Hi

On Wed, May 06, 2020 at 09:16:24PM +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 05/06/2020 08:42 PM, Sergey.Semin@...kalelectronics.ru wrote:
> 
> > From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > 
> > Similar to commit 8e5c62e38a88 ("mips: early_printk_8250: Use offset-sized
> > IO-mem accessors") the IO-memory might require to use a proper load/store
> > instructions (like Bailal-T1 IO-memory). To fix the cps-vec UART debug
> 
>    Baikal? :-)

Yeah, thanks.)

> 
> > printout lets use the memory access instructions in accordance with the
> > UART registers offset config specified at boot time.
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Paul Burton <paulburton@...nel.org>
> > Cc: Ralf Baechle <ralf@...ux-mips.org>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: linux-pm@...r.kernel.org
> > Cc: devicetree@...r.kernel.org
> > 
> > ---
> > There might be another problem in cps-vec-ns16550.S connected with the
> > difference in CPU/devices endinanness on some platforms. But there is
> 
>    Endianness.

Ah, this won't get into the commit message anyway. But thanks for noticing.)

-Sergey


> 
> > no such for Baikal-T1 SoC.
> [...]
> 
> MBR, Sergei