[PATCH V5 00/11] Refactor ufs phy powerup sequence

Nitin Rawat
2025-05-15T16:27:51Z

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 v5:
1. Addressed Dmitry's comment to inline inline qmp_ufs_exit into
qmp_ufs_power_off
2. Addrsssed Konrad's comment to improve code identation and updating
kernel doc to update the info regarding controller and phy clocks
being managed together.
3. Addrsssed Konrad's comment to update commit text for patch #10 to
improve explanation to maintain separate ref_count in ufs controller
driver.

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 | 102 +++++++++++------
drivers/ufs/host/ufs-qcom.h | 4 +
3 files changed, 117 insertions(+), 134 deletions(-)

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2.48.1