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scsi: ufs: ufs-mediatek: Disable unused VCCQx power rails 

Some MediaTek UFS platforms support different VCCQx power rails, for
example, both 1.2v and 1.8v VCCQx, in a single kernel image.

To optimize the system power consumption, provide a way to disable and
release the unused power rail during the device probing.

Link: https://lore.kernel.org/r/20220616053725.5681-12-stanley.chu@mediatek.com
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2022-06-16 13:37:25 +08:00 committed by Martin K. Petersen
parent ece418d029
commit cb142b6d2f
1 changed files with 24 additions and 0 deletions
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24
drivers/ufs/host/ufs-mediatek.c
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@ -712,6 +712,29 @@ static int ufs_mtk_vreg_fix_vcc(struct ufs_hba *hba)
return err;
}
static void ufs_mtk_vreg_fix_vccqx(struct ufs_hba *hba)
{
struct ufs_vreg_info *info = &hba->vreg_info;
struct ufs_vreg **vreg_on, **vreg_off;
if (hba->dev_info.wspecversion >= 0x0300) {
vreg_on = &info->vccq;
vreg_off = &info->vccq2;
} else {
vreg_on = &info->vccq2;
vreg_off = &info->vccq;
}
if (*vreg_on)
(*vreg_on)->always_on = true;
if (*vreg_off) {
regulator_disable((*vreg_off)->reg);
devm_kfree(hba->dev, (*vreg_off)->name);
devm_kfree(hba->dev, *vreg_off);
}
}
/**
* ufs_mtk_init - find other essential mmio bases
* @hba: host controller instance
@ -1241,6 +1264,7 @@ static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba)
}
ufs_mtk_vreg_fix_vcc(hba);
ufs_mtk_vreg_fix_vccqx(hba);
}
static void ufs_mtk_event_notify(struct ufs_hba *hba,