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

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On 7/11/2024 3:31 AM, Konrad Dybcio wrote:
On 10.07.2024 7:01 PM, Rob Clark wrote:
On Tue, Jul 9, 2024 at 12:43 PM Bibek Kumar Patro
<quic_bibekkum@xxxxxxxxxxx> 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()
}


This would have been a straight forward way to pass as a check for PRR
support, but as I mentioned in the above thread reserved-memory region is not required if gfx/drm allocates the page.
So I think compatible string would be more approachable way?

Thanks & regards,
Bibek

Konrad




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