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scsi: ufs: host: mediatek: Support UFS PHY runtime PM and correct sequence

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Add support for UFS PHY runtime power management by probing the PHY
device and enabling its runtime PM. Ensure the correct sequence of
operations during suspend and resume: PHY suspend -> UFS suspend -> UFS
resume -> PHY resume.  Improve power management efficiency and system
stability with this enhancement.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Peter Wang
2025-09-03 10:44:41 +08:00
committed by Martin K. Petersen
parent b2f8abadab
commit c73cd5e298
2 changed files with 48 additions and 6 deletions
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53
drivers/ufs/host/ufs-mediatek.c
View File

@@ -2243,10 +2243,12 @@ static const struct ufs_hba_variant_ops ufs_hba_mtk_vops = {
static int ufs_mtk_probe(struct platform_device *pdev)
{
int err;
struct device *dev = &pdev->dev;
struct device_node *reset_node;
struct platform_device *reset_pdev;
struct device *dev = &pdev->dev, *phy_dev = NULL;
struct device_node *reset_node, *phy_node = NULL;
struct platform_device *reset_pdev, *phy_pdev = NULL;
struct device_link *link;
struct ufs_hba *hba;
struct ufs_mtk_host *host;
reset_node = of_find_compatible_node(NULL, NULL,
"ti,syscon-reset");
@@ -2273,13 +2275,44 @@ static int ufs_mtk_probe(struct platform_device *pdev)
}
skip_reset:
/* find phy node */
phy_node = of_parse_phandle(dev->of_node, "phys", 0);
if (phy_node) {
phy_pdev = of_find_device_by_node(phy_node);
if (!phy_pdev)
goto skip_phy;
phy_dev = &phy_pdev->dev;
pm_runtime_set_active(phy_dev);
pm_runtime_enable(phy_dev);
pm_runtime_get_sync(phy_dev);
put_device(phy_dev);
dev_info(dev, "phys node found\n");
} else {
dev_notice(dev, "phys node not found\n");
}
skip_phy:
/* perform generic probe */
err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops);
if (err) {
dev_err(dev, "probe failed %d\n", err);
goto out;
}
hba = platform_get_drvdata(pdev);
if (!hba)
goto out;
if (phy_node && phy_dev) {
host = ufshcd_get_variant(hba);
host->phy_dev = phy_dev;
}
out:
if (err)
dev_err(dev, "probe failed %d\n", err);
of_node_put(phy_node);
of_node_put(reset_node);
return err;
}
@@ -2343,6 +2376,7 @@ out:
static int ufs_mtk_runtime_suspend(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct arm_smccc_res res;
int ret = 0;
@@ -2355,17 +2389,24 @@ static int ufs_mtk_runtime_suspend(struct device *dev)
if (ufs_mtk_is_rtff_mtcmos(hba))
ufs_mtk_mtcmos_ctrl(false, res);
if (host->phy_dev)
pm_runtime_put_sync(host->phy_dev);
return 0;
}
static int ufs_mtk_runtime_resume(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
struct arm_smccc_res res;
if (ufs_mtk_is_rtff_mtcmos(hba))
ufs_mtk_mtcmos_ctrl(true, res);
if (host->phy_dev)
pm_runtime_get_sync(host->phy_dev);
ufs_mtk_dev_vreg_set_lpm(hba, false);
return ufshcd_runtime_resume(dev);

1
drivers/ufs/host/ufs-mediatek.h
View File

@@ -193,6 +193,7 @@ struct ufs_mtk_host {
bool is_mcq_intr_enabled;
int mcq_nr_intr;
struct ufs_mtk_mcq_intr_info mcq_intr_info[UFSHCD_MAX_Q_NR];
struct device *phy_dev;
};
/* MTK delay of autosuspend: 500 ms */