linux-kernel - [PATCH v2 0/2] Add interconnect driver for SDX55

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Message-Id: <20210121053254.8355-1-manivannan.sadhasivam@linaro.org>
Date:   Thu, 21 Jan 2021 11:02:52 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     georgi.djakov@...aro.org, robh+dt@...nel.org
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        okukatla@...eaurora.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 0/2] Add interconnect driver for SDX55

Hello Georgi,

This small series adds interconnect driver support for SDX55 platform for
scaling the bandwidth requirements over RPMh. The driver has been tested
on SDX55-MTP and gives below DDR metrics using mbw [1] tool:

Src port: SDX55_MASTER_AMPSS_M0
Dest port: SDX55_SLAVE_EBI_CH0

Command: mbw 100

With bandwidth 500000:
AVG     Method: MEMCPY  Elapsed: 0.59058        MiB: 100.00000  Copy: 169.324 MiB/s
With bandwidth 700000:
AVG     Method: MEMCPY  Elapsed: 0.29267        MiB: 100.00000  Copy: 341.678 MiB/s
With bandwidth 900000:
AVG     Method: MEMCPY  Elapsed: 0.19608        MiB: 100.00000  Copy: 510.005 MiB/s

The copy speed seems to be the same for all bandwidth less than 500000 and
greater than 900000.

Note: The CPUFreq governer needs to be set to something other than schedutil to
see the difference. Otherwise the speed seems to be the same for all bandwidth.

Thanks,
Mani

[1] https://github.com/raas/mbw

Changes in v2:

* Changed the copyright year to 2021, fixed Kconfig dependency and constified
  provider struct definitions.

Manivannan Sadhasivam (2):
  dt-bindings: interconnect: Add Qualcomm SDX55 DT bindings
  interconnect: qcom: Add SDX55 interconnect provider driver

 .../bindings/interconnect/qcom,rpmh.yaml      |   4 +
 drivers/interconnect/qcom/Kconfig             |   9 +
 drivers/interconnect/qcom/Makefile            |   2 +
 drivers/interconnect/qcom/sdx55.c             | 356 ++++++++++++++++++
 drivers/interconnect/qcom/sdx55.h             |  70 ++++
 include/dt-bindings/interconnect/qcom,sdx55.h |  76 ++++
 6 files changed, 517 insertions(+)
 create mode 100644 drivers/interconnect/qcom/sdx55.c
 create mode 100644 drivers/interconnect/qcom/sdx55.h
 create mode 100644 include/dt-bindings/interconnect/qcom,sdx55.h

-- 
2.25.1