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Message-ID: <20220614141655.14409-7-stanley.chu@mediatek.com>
Date: Tue, 14 Jun 2022 22:16:51 +0800
From: Stanley Chu <stanley.chu@...iatek.com>
To: <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<martin.petersen@...cle.com>, <avri.altman@....com>,
<alim.akhtar@...sung.com>, <jejb@...ux.ibm.com>,
<bvanassche@....org>
CC: <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
<alice.chao@...iatek.com>, <powen.kao@...iatek.com>,
<mason.zhang@...iatek.com>, <qilin.tan@...iatek.com>,
<lin.gui@...iatek.com>, <eddie.huang@...iatek.com>,
<tun-yu.yu@...iatek.com>, <cc.chou@...iatek.com>,
<chaotian.jing@...iatek.com>, <jiajie.hao@...iatek.com>,
<stanley.chu@...iatek.com>
Subject: [PATCH v3 06/10] scsi: ufs-mediatek: Support low-power mode for VCCQ
From: Peter Wang <peter.wang@...iatek.com>
Also allow VCCQ to enter low-power mode, and meanwhile
remove the restriction of VCC because VCCQ/VCCQ2 can
be changed to low-power mode even if VCC keeps on while
the device is not in active power mode.
Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
Signed-off-by: Peter Wang <peter.wang@...iatek.com>
Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
drivers/ufs/host/ufs-mediatek.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index c9afe373437c..178043ab837c 100755
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1031,7 +1031,13 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
{
- if (!hba->vreg_info.vccq2 || !hba->vreg_info.vcc)
+ struct ufs_vreg *vccqx = NULL;
+
+ if (!hba->vreg_info.vccq && !hba->vreg_info.vccq2)
+ return;
+
+ /* Skip if VCC is assumed always-on */
+ if (!hba->vreg_info.vcc)
return;
/* Bypass LPM when device is still active */
@@ -1042,12 +1048,13 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
if (lpm && hba->vreg_info.vcc->enabled)
return;
- if (lpm)
- regulator_set_mode(hba->vreg_info.vccq2->reg,
- REGULATOR_MODE_IDLE);
+ if (hba->vreg_info.vccq)
+ vccqx = hba->vreg_info.vccq;
else
- regulator_set_mode(hba->vreg_info.vccq2->reg,
- REGULATOR_MODE_NORMAL);
+ vccqx = hba->vreg_info.vccq2;
+
+ regulator_set_mode(vccqx->reg,
+ lpm ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL);
}
static void ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba)
--
2.18.0
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