diff options
| author | Peter Wang <peter.wang@mediatek.com> | 2025-09-03 05:44:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-13 23:34:21 +0300 |
| commit | 10ad4de87f32c8a93d95ca2c29bcfbd3abbfddab (patch) | |
| tree | 2f9afd15879798b3cdc81d77aa56e7f349e648ce /drivers/ufs | |
| parent | 70b956be58696247a83860da626076bd014251ef (diff) | |
| download | linux-10ad4de87f32c8a93d95ca2c29bcfbd3abbfddab.tar.xz | |
scsi: ufs: host: mediatek: Correct system PM flow
[ Upstream commit 77b96ef70b6ba46e3473e5e3a66095c4bc0e93a4 ]
Refine the system power management (PM) flow by skipping low power mode
(LPM) and MTCMOS settings if runtime PM is already applied. Prevent
redundant operations to ensure a more efficient PM process.
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/ufs')
| -rw-r--r-- | drivers/ufs/host/ufs-mediatek.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c index 7c13bce03694..003ca5ad8822 100644 --- a/drivers/ufs/host/ufs-mediatek.c +++ b/drivers/ufs/host/ufs-mediatek.c @@ -1989,27 +1989,38 @@ static int ufs_mtk_system_suspend(struct device *dev) ret = ufshcd_system_suspend(dev); if (ret) - return ret; + goto out; + + if (pm_runtime_suspended(hba->dev)) + goto out; ufs_mtk_dev_vreg_set_lpm(hba, true); if (ufs_mtk_is_rtff_mtcmos(hba)) ufs_mtk_mtcmos_ctrl(false, res); - return 0; +out: + return ret; } static int ufs_mtk_system_resume(struct device *dev) { + int ret = 0; struct ufs_hba *hba = dev_get_drvdata(dev); struct arm_smccc_res res; + if (pm_runtime_suspended(hba->dev)) + goto out; + ufs_mtk_dev_vreg_set_lpm(hba, false); if (ufs_mtk_is_rtff_mtcmos(hba)) ufs_mtk_mtcmos_ctrl(true, res); - return ufshcd_system_resume(dev); +out: + ret = ufshcd_system_resume(dev); + + return ret; } #endif |