linux-kernel - [PATCH v3 00/10] Fix up icc clock rate calculation on some platforms

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Date:   Tue, 08 Aug 2023 13:43:31 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Georgi Djakov <djakov@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v3 00/10] Fix up icc clock rate calculation on some
 platforms

Certain platforms require that some buses (or individual nodes) make
some additional changes to the clock rate formula, throwing in some
magic, Qualcomm-defined coefficients, to account for "inefficiencies".

Add the framework for it and utilize it on a couple SoCs.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
Changes in v3:
- Allocate the node bus clock on the stack, as dynamically allocating
  it actually wastes memory on systems with 64-bit pointers..
- Add the node bus clock struct member in the correct patch
- Simplify using coefficients by only checking the node-level ones, and
  setting them equal to the bus-specific ones at probe if absent
- Fix building on arm32
- Mention some references to the related downstream code
- Link to v2: https://lore.kernel.org/r/20230726-topic-icc_coeff-v2-0-8c91c6c76076@linaro.org

Changes in v2:
- Use the (arguably less favourable but necessary for precission) 100/x
  instead of x/100 for ib coefficient, update values in consequent
  patches to reflect that
- Rename "_percent" to "_coeff" because of /\
- Add the necessary code to support per-node clocks
- Add the necessary code to support per-node coefficients
- Hook up the CPUSS<->GNoC clock on QCM2290
- Update EBI node on QCM2290
- Link to v1: https://lore.kernel.org/r/20230726-topic-icc_coeff-v1-0-31616960818c@linaro.org

---
Konrad Dybcio (10):
      interconnect: qcom: icc-rpm: Add AB/IB calculations coefficients
      interconnect: qcom: icc-rpm: Separate out clock rate calulcations
      interconnect: qcom: icc-rpm: Let nodes drive their own bus clock
      interconnect: qcom: icc-rpm: Check for node-specific rate coefficients
      interconnect: qcom: qcm2290: Hook up MAS_APPS_PROC's bus clock
      interconnect: qcom: qcm2290: Set AB coefficients
      interconnect: qcom: qcm2290: Update EBI channel configuration
      interconnect: qcom: sdm660: Set AB/IB coefficients
      interconnect: qcom: msm8996: Set AB/IB coefficients
      clk: qcom: smd-rpm: Move CPUSS_GNoC clock to interconnect

 drivers/clk/qcom/clk-smd-rpm.c             | 16 +++++--
 drivers/interconnect/qcom/icc-rpm-clocks.c |  6 +++
 drivers/interconnect/qcom/icc-rpm.c        | 76 +++++++++++++++++++++++++-----
 drivers/interconnect/qcom/icc-rpm.h        | 15 ++++++
 drivers/interconnect/qcom/msm8996.c        |  8 +++-
 drivers/interconnect/qcom/qcm2290.c        |  9 +++-
 drivers/interconnect/qcom/sdm660.c         |  4 ++
 7 files changed, 115 insertions(+), 19 deletions(-)
---
base-commit: 71cd4fc492ec41e4acd85e98bbf7a13753fc1e03
change-id: 20230726-topic-icc_coeff-b053d5409b9f

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@...aro.org>