Re: [PATCH 0/3] arm64: dts: qcom: sa8775p: Add interconnect to SMMU

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On 2023-06-09 13:56, Parikshit Pareek wrote:
On Fri, Jun 09, 2023 at 10:52:26AM +0200, Konrad Dybcio wrote:


On 9.06.2023 07:41, Parikshit Pareek wrote:
Some qcom SoCs have SMMUs, which need the interconnect bandwidth to be
This series introduce the due support for associated interconnect, and
setting of the due interconnect-bandwidth. Setting due interconnect
bandwidth is needed to avoid the issues like [1], caused by not having
due clock votes(indirectly dependent upon interconnect bandwidth).

[1] ???

My bad. Intended to mention following:
https://lore.kernel.org/linux-arm-msm/20230418165224.vmok75fwcjqdxspe@echanude/

This sounds super-dodgy - do you really have to rely on configuration of the interconnect path from the SMMU's pagetable walker to RAM to keep a completely different interconnect path clocked for the CPU to access SMMU registers? You can't just request the programming interface clock directly like on other SoCs?

Thanks,
Robin.



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