linux-kernel - Re: [PATCH 2/2] arch: arm64: xilinx: Make zynqmp

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Date:   Tue, 25 Feb 2020 16:12:13 -0800
From:   Jolly Shah <jolly.shah@...inx.com>
To:     Michal Simek <michal.simek@...inx.com>,
        Jolly Shah <jolly.shah@...inx.com>, ard.biesheuvel@...aro.org,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        matt@...eblueprint.co.uk, sudeep.holla@....com,
        hkallweit1@...il.com, keescook@...omium.org,
        dmitry.torokhov@...il.com
Cc:     rajanv@...inx.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Tejas Patel <tejas.patel@...inx.com>
Subject: Re: [PATCH 2/2] arch: arm64: xilinx: Make zynqmp_firmware driver
 optional

Hi Michal,

 > ------Original Message------
 > From: Michal Simek <michal.simek@...inx.com>
 > Sent:  Monday, February 24, 2020 2:43AM
 > To: Jolly Shah <jolly.shah@...inx.com>, Ard.biesheuvel@...aro.org 
<ard.biesheuvel@...aro.org>, Mingo@...nel.org <mingo@...nel.org>, 'Greg 
Kh' <gregkh@...uxfoundation.org>, Matt@...eblueprint.co.uk 
<matt@...eblueprint.co.uk>, Sudeep.holla@....com <sudeep.holla@....com>, 
Hkallweit1@...il.com <hkallweit1@...il.com>, Keescook@...omium.org 
<keescook@...omium.org>, Dmitry.torokhov@...il.com 
<dmitry.torokhov@...il.com>, Michal Simek <michal.simek@...inx.com>
 > Cc: Rajan Vaja <rajanv@...inx.com>, 
Linux-arm-kernel@...ts.infradead.org 
<linux-arm-kernel@...ts.infradead.org>, Linux-kernel@...r.kernel.org 
<linux-kernel@...r.kernel.org>, Tejas Patel <tejas.patel@...inx.com>
 > Subject: Re: [PATCH 2/2] arch: arm64: xilinx: Make zynqmp_firmware 
driver optional
 >
> On 09. 01. 20 20:06, Jolly Shah wrote:
>> From: Tejas Patel <tejas.patel@...inx.com>
>>
>> Zynqmp firmware driver requires firmware to be present in system.
>> Zynqmp firmware driver will crash if firmware is not present in system.
>> For example single arch QEMU, may not have firmware, with such setup
>> Linux booting fails.
> 
> 
> I think that moving it to firmware Kconfig is good solution. What it is
> wrong is that description above where I agree with Sudeep.
> It means.
> 1. User should have option to disable zynqmp firmware driver which is
> what this patch allows. It means if someone decides to use different
> firmware mechanism it can do it directly by simply y/n option.
> 
> 2. Autodetection of PMUFW presence is another feature which could be
> implemented to have this driver enabled but different mechanism can be
> used.
> 
> 3. Doing this because of missing feature in QEMU is IMHO wrong. QEMU
> should be fixed and then you don't have any issue if this should be used
> or not.
> 
> Just a summary. Remove that QEMU example from commit message and talk to
> Edgar to fix single QEMU solution to have that regs mapped all the time.

Pushed another patch as suggested. Will sync up with Edgar.

Thanks,
Jolly Shah

> 
> Thanks,
> Michal
>