linux-kernel - [PATCH 3/4] scsi: ufs-mediatek: Fix flag of unipro low-power mode

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Message-ID: <20200908064507.30774-4-stanley.chu@mediatek.com>
Date:   Tue, 8 Sep 2020 14:45:06 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>
CC:     <matthias.bgg@...il.com>, <bvanassche@....org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>, <chaotian.jing@...iatek.com>,
        <cc.chou@...iatek.com>, Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH 3/4] scsi: ufs-mediatek: Fix flag of unipro low-power mode

Forcibly leave UniPro low-power mode if UIC commands is failed.
This makes hba_enable_delay_us as correct (default) value for
re-enabling the host.

At the same time, change type of parameter "lpm" in function
ufs_mtk_unipro_set_pm() to "bool".

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/scsi/ufs/ufs-mediatek.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index 887c03e8bcc0..feba74a72309 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -419,7 +419,7 @@ static int ufs_mtk_pwr_change_notify(struct ufs_hba *hba,
 	return ret;
 }
 
-static int ufs_mtk_unipro_set_pm(struct ufs_hba *hba, u32 lpm)
+static int ufs_mtk_unipro_set_pm(struct ufs_hba *hba, bool lpm)
 {
 	int ret;
 	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
@@ -427,8 +427,14 @@ static int ufs_mtk_unipro_set_pm(struct ufs_hba *hba, u32 lpm)
 	ret = ufshcd_dme_set(hba,
 			     UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
 			     lpm);
-	if (!ret)
+	if (!ret || !lpm) {
+		/*
+		 * Forcibly set as non-LPM mode if UIC commands is failed
+		 * to use default hba_enable_delay_us value for re-enabling
+		 * the host.
+		 */
 		host->unipro_lpm = lpm;
+	}
 
 	return ret;
 }
@@ -438,7 +444,9 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
 	int ret;
 	u32 tmp;
 
-	ufs_mtk_unipro_set_pm(hba, 0);
+	ret = ufs_mtk_unipro_set_pm(hba, false);
+	if (ret)
+		return ret;
 
 	/*
 	 * Setting PA_Local_TX_LCC_Enable to 0 before link startup
@@ -546,7 +554,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
 	if (err)
 		return err;
 
-	err = ufs_mtk_unipro_set_pm(hba, 0);
+	err = ufs_mtk_unipro_set_pm(hba, false);
 	if (err)
 		return err;
 
@@ -567,10 +575,10 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
 {
 	int err;
 
-	err = ufs_mtk_unipro_set_pm(hba, 1);
+	err = ufs_mtk_unipro_set_pm(hba, true);
 	if (err) {
 		/* Resume UniPro state for following error recovery */
-		ufs_mtk_unipro_set_pm(hba, 0);
+		ufs_mtk_unipro_set_pm(hba, false);
 		return err;
 	}
 
-- 
2.18.0