linux-kernel - Re: [PATCH v13 6/6] iommu/arm-smmu: add support for PRR bit setup

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Message-ID: <f4994451-9dc4-4d25-b544-49531709e76d@linaro.org>
Date: Thu, 11 Jul 2024 00:01:19 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Rob Clark <robdclark@...il.com>,
 Bibek Kumar Patro <quic_bibekkum@...cinc.com>
Cc: will@...nel.org, robin.murphy@....com, joro@...tes.org, jgg@...pe.ca,
 jsnitsel@...hat.com, robh@...nel.org, krzysztof.kozlowski@...aro.org,
 quic_c_gdjako@...cinc.com, dmitry.baryshkov@...aro.org,
 iommu@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH v13 6/6] iommu/arm-smmu: add support for PRR bit setup

On 10.07.2024 7:01 PM, Rob Clark wrote:
> On Tue, Jul 9, 2024 at 12:43 PM Bibek Kumar Patro
> <quic_bibekkum@...cinc.com> wrote:

[...]

> If there is a clean break, such as all smmu-500 have PRR and all
> smmu-v2 do not, then it would be reasonable to use the compat strings.
> If not, I think we need a different way.

if (a reserved-memory region is passed in dt) {
	init_prr()
}

Konrad