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scsi: ufs: ufs-qcom: Disable lane clocks during phy hibern8

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Currently, the UFS lane clocks remain enabled even after the link enters
the Hibern8 state and are only disabled during runtime/system
suspend.This patch modifies the behavior to disable the lane clocks
during ufs_qcom_setup_clocks(), which is invoked shortly after the link
enters Hibern8 via gate work.

While hibern8_notify() offers immediate control, toggling clocks on
every transition isn't ideal due to varied contexts like clock scaling.
Since setup_clocks() manages PHY/controller resources and is invoked
soon after Hibern8 entry, it serves as a central and stable point for
clock gating.

Signed-off-by: Palash Kambar <quic_pkambar@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Message-ID: <20250909055149.2068737-1-quic_pkambar@quicinc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Palash Kambar 2025-09-09 11:21:49 +05:30 committed by Martin K. Petersen
parent 0bd0e43776
commit c1553fc105
1 changed files with 10 additions and 0 deletions
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10
drivers/ufs/host/ufs-qcom.c
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@ -1183,6 +1183,13 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
case PRE_CHANGE:
if (on) {
ufs_qcom_icc_update_bw(host);
if (ufs_qcom_is_link_hibern8(hba)) {
err = ufs_qcom_enable_lane_clks(host);
if (err) {
dev_err(hba->dev, "enable lane clks failed, ret=%d\n", err);
return err;
}
}
} else {
if (!ufs_qcom_is_link_active(hba)) {
/* disable device ref_clk */
@ -1208,6 +1215,9 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
if (ufshcd_is_hs_mode(&hba->pwr_info))
ufs_qcom_dev_ref_clk_ctrl(host, true);
} else {
if (ufs_qcom_is_link_hibern8(hba))
ufs_qcom_disable_lane_clks(host);
ufs_qcom_icc_set_bw(host, ufs_qcom_bw_table[MODE_MIN][0][0].mem_bw,
ufs_qcom_bw_table[MODE_MIN][0][0].cfg_bw);
}