linux-kernel - Re: [PATCH] arm64/sysreg: Add register fields for ID_AA64DFR1

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Date: Sun, 18 Feb 2024 06:04:34 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Mark Brown <broonie@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/sysreg: Add register fields for ID_AA64DFR1_EL1



On 2/15/24 18:34, Mark Brown wrote:
> On Thu, Feb 15, 2024 at 12:24:54PM +0530, Anshuman Khandual wrote:
> 
>>  Sysreg	ID_AA64DFR1_EL1	3	0	0	5	1
>> -Res0	63:0
>> +Field	63:56	ABL_CMPs
>> +Field	55:52	DPFZS
> 
> This is documented in the architecture as an enumeration, though I'm not
> immediately seeing what values to use.

Just wondering - would something like the following make sense. Because
0b0000 signifies that the cycle counter would just ignore PMCR_EL0.FZS,
where as it gets frozen with 0b0001.

UnsignedEnum   55:52   DPFZS
       0b0000  IGNR
       0b0001  FRZN
EndEnum

> 
> Otherwise this looks good.