Commit cb142b6d authored by Stanley Chu's avatar Stanley Chu Committed by Martin K. Petersen
Browse files

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: default avatarStanley Chu <stanley.chu@mediatek.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent ece418d0

drivers/ufs/host/ufs-mediatek.c

+24 −0
Original line number Diff line number Diff line
@@ -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,