linux-kernel - [Patch v1 00/10] Tegra234 Memory interconnect support

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Date:   Tue, 20 Dec 2022 21:32:30 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <treding@...dia.com>, <krzysztof.kozlowski@...aro.org>,
        <dmitry.osipenko@...labora.com>, <viresh.kumar@...aro.org>,
        <rafael@...nel.org>, <jonathanh@...dia.com>, <robh+dt@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     <sanjayc@...dia.com>, <ksitaraman@...dia.com>, <ishah@...dia.com>,
        <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [Patch v1 00/10] Tegra234 Memory interconnect support

This patch series adds memory interconnect support for Tegra234 SoC.
It is used to dynamically scale DRAM Frequency as per the bandwidth
requests from different Memory Controller (MC) clients.
MC Clients use ICC Framework's icc_set_bw() api to dynamically request
for the DRAM bandwidth (BW). As per path, the request will be routed
from MC to the EMC driver. EMC driver will then send the Client ID,
type, and frequency request info to the BPMP-FW which will set the
final DRAM freq considering all exisiting requests.

MC and EMC are the ICC providers. Nodes in path for a request will be:
     Client[1-n] -> MC -> EMC -> EMEM/DRAM

The patch series also adds interconnect support in the CPUFREQ driver
for scaling bandwidth with CPU frequency. For that, added per cluster
OPP table in the CPUFREQ driver and using that to scale DRAM freq by
requesting the minimum BW respective to the given CPU frequency in OPP
table for that cluster.

Sumit Gupta (10):
  memory: tegra: add interconnect support for DRAM scaling in Tegra234
  memory: tegra: adding iso mc clients for Tegra234
  memory: tegra: add pcie mc clients for Tegra234
  memory: tegra: add support for software mc clients in Tegra234
  dt-bindings: tegra: add icc ids for dummy MC clients
  arm64: tegra: Add cpu OPP tables and interconnects property
  cpufreq: Add Tegra234 to cpufreq-dt-platdev blocklist
  cpufreq: tegra194: add OPP support and set bandwidth
  memory: tegra: get number of enabled mc channels
  memory: tegra: make cluster bw request a multiple of mc_channels

 arch/arm64/boot/dts/nvidia/tegra234.dtsi | 276 +++++++++++
 drivers/cpufreq/cpufreq-dt-platdev.c     |   1 +
 drivers/cpufreq/tegra194-cpufreq.c       | 152 +++++-
 drivers/memory/tegra/mc.c                |  80 +++-
 drivers/memory/tegra/mc.h                |   1 +
 drivers/memory/tegra/tegra186-emc.c      | 166 +++++++
 drivers/memory/tegra/tegra234.c          | 565 ++++++++++++++++++++++-
 include/dt-bindings/memory/tegra234-mc.h |   5 +
 include/soc/tegra/mc.h                   |  11 +
 include/soc/tegra/tegra-icc.h            |  79 ++++
 10 files changed, 1312 insertions(+), 24 deletions(-)
 create mode 100644 include/soc/tegra/tegra-icc.h

-- 
2.17.1