Message-ID: <20250503162440.2954-1-quic_nitirawa@quicinc.com>
Date: Sat,  3 May 2025 21:54:29 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: vkoul@...nel.org, kishon@...nel.org, manivannan.sadhasivam@...aro.org,
        James.Bottomley@...senPartnership.com, martin.petersen@...cle.com,
        bvanassche@....org, andersson@...nel.org, neil.armstrong@...aro.org,
        konrad.dybcio@....qualcomm.com
Cc: quic_rdwivedi@...cinc.com, quic_cang@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Nitin Rawat <quic_nitirawa@...cinc.com>
Subject: [PATCH V4 00/11] Refactor ufs phy powerup sequence

In Current code regulators enable, clks enable, calibrating UFS PHY,
start_serdes and polling PCS_ready_status are part of phy_power_on.

UFS PHY registers are retained after power collapse, meaning calibrating
UFS PHY, start_serdes and polling PCS_ready_status can be done only when
hba is powered_on, and not needed every time when phy_power_on is called
during resume. Hence keep the code which enables PHY's regulators & clks
in phy_power_on and move the rest steps into phy_calibrate function.

Since phy_power_on is separated out from phy calibrate, make separate calls
to phy_power_on and phy_calibrate calls from ufs qcom driver.

Also for better power saving, remove the phy_power_on/off calls from
resume/suspend path and put them to ufs_qcom_setup_clocks, so that
PHY's regulators & clks can be turned on/off along with UFS's clocks.

This patch series is tested on SM8550 QRD, SM8650 MTP , SM8750 MTP.

Note: Patch 1 of this series is a requirement for the rest of the PHY
      patches for the functional dependency.

Changes in v4:
1. Addressed Dmitry's comment to update cover letter to mention patch1
   as a requirement for the rest of the PHY patches.
2. Addressed Dmitry's comment to move parsing UFS PHY reset handle logic
   to init from probe to avoid probe failure.
3. Addressed Dmitry's comment to update commit text to reflect reason
   to remove qmp_ufs_com_init() (Patch 7 of current series)
4. Addrssed Konrad's comment to return failure from power up sequence when
    phy_calibrate return failure and modify the debug print.

Changes in v3:
1. Addresed neil and bjorn comment to align the order of the patch to
   maintain the bisectability compliance within the patch.
2. Addressed neil comment to move qmp_ufs_get_phy_reset() in a separate
   patch, inline qmp_ufs_com_init() inline.

Changes in v2:
1. Addressed vinod koul and manivannan comment to split the phy patch
   into multiple patches.
2. Addressed vinod's comment to reuse SW_PWRDN instead of creating
   new macros SW_PWRUP in phy-qcom-qmp-ufs.c.
3. Addressed Konrad's comment to optimize mutex lock in ufs-qcom.c
4. Addressed konrad and Manivannan comment to clean debug print in
   ufs-qcom.c


Nitin Rawat (11):
  scsi: ufs: qcom: add a new phy calibrate API call
  phy: qcom-qmp-ufs: Rename qmp_ufs_enable and qmp_ufs_power_on
  phy: qcom-qmp-ufs: Refactor phy_power_on and phy_calibrate callbacks
  phy: qcom-qmp-ufs: Refactor UFS PHY reset
  phy: qcom-qmp-ufs: Remove qmp_ufs_com_init()
  phy: qcom-qmp-ufs: Rename qmp_ufs_power_off
  phy: qcom-qmp-ufs: Remove qmp_ufs_exit() and Inline qmp_ufs_com_exit()
  phy: qcom-qmp-ufs: refactor qmp_ufs_power_off
  scsi: ufs: qcom : Refactor phy_power_on/off calls
  scsi: ufs: qcom : Introduce phy_power_on/off wrapper function
  scsi: ufs: qcom: Prevent calling phy_exit before phy_init

 drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 145 ++++++++----------------
 drivers/ufs/host/ufs-qcom.c             |  96 ++++++++++------
 drivers/ufs/host/ufs-qcom.h             |   4 +
 3 files changed, 111 insertions(+), 134 deletions(-)

--
2.48.1

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