linux-kernel - [PATCH v2 0/8] Support Multi-frequency scale for UFS

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Message-Id: <20250122100214.489749-1-quic_ziqichen@quicinc.com>
Date: Wed, 22 Jan 2025 18:02:06 +0800
From: Ziqi Chen <quic_ziqichen@...cinc.com>
To: quic_cang@...cinc.com, bvanassche@....org, mani@...nel.org,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, quic_ziqichen@...cinc.com,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        linux-kernel@...r.kernel.org (open list:ARM/Mediatek SoC support:Keyword:mediatek),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC support:Keyword:mediatek),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC support:Keyword:mediatek)
Subject: [PATCH v2 0/8] Support Multi-frequency scale for UFS

With OPP V2 enabled, devfreq can scale clocks amongst multiple frequency
plans. However, the gear speed is only toggled between min and max during
clock scaling. Enable multi-level gear scaling by mapping clock frequencies
to gear speeds, so that when devfreq scales clock frequencies we can put
the UFS link at the appropraite gear speeds accordingly.

This series has been tested on below platforms -
sm8550 mtp + UFS3.1
SM8650 MTP + UFS3.1
SM8750 MTP + UFS4.0

v1 -> v2:
1. Withdraw old patch 8/8 "ARM: dts: msm: Use Operation Points V2 for UFS on SM8650"
2. Add new patch 8/8 "ABI: sysfs-driver-ufs: Add missing UFS sysfs addributes"
3. Modify commit message for  "scsi: ufs: core: Pass target_freq to clk_scale_notify() vops" and "scsi: ufs: qcom: Pass target_freq to clk scale pre and post change"
4. In "scsi: ufs: qcom: Pass target_freq to clk scale pre and post change", use common Macro HZ_PER_MHZ in function ufs_qcom_set_core_clk_ctrl()
5. In "scsi: ufs: qcom: Implement the freq_to_gear_speed() vops", print out freq and gear info as debugging message
6. In "scsi: ufs: core: Enable multi-level gear scaling", rename the lable "do_pmc" to "config_pwr_mode"
7. In "scsi: ufs: core: Toggle Write Booster during clock", initialize the local variables "wb_en" as "false"

Can Guo (6):
  scsi: ufs: core: Pass target_freq to clk_scale_notify() vops
  scsi: ufs: qcom: Pass target_freq to clk scale pre and post change
  scsi: ufs: core: Add a vops to map clock frequency to gear speed
  scsi: ufs: qcom: Implement the freq_to_gear_speed() vops
  scsi: ufs: core: Enable multi-level gear scaling
  scsi: ufs: core: Toggle Write Booster during clock scaling base on
    gear speed

Ziqi Chen (2):
  scsi: ufs: core: Check if scaling up is required when disable clkscale
  ABI: sysfs-driver-ufs: Add missing UFS sysfs addributes

 Documentation/ABI/testing/sysfs-driver-ufs | 31 ++++++++++
 drivers/ufs/core/ufshcd-priv.h             | 17 +++++-
 drivers/ufs/core/ufshcd.c                  | 71 ++++++++++++++++------
 drivers/ufs/host/ufs-mediatek.c            |  1 +
 drivers/ufs/host/ufs-qcom.c                | 66 +++++++++++++++-----
 include/ufs/ufshcd.h                       |  8 ++-
 6 files changed, 159 insertions(+), 35 deletions(-)

-- 
2.34.1