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

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Date:   Wed, 20 Jan 2021 13:36:25 +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 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

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             |  10 +
 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, 518 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