linux-kernel - [PATCH v1 5/7] scsi: ufs-mediatek: Disable reset confirm feature by UniPro

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Date:   Wed, 22 Jun 2022 15:37:17 +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 v1 5/7] scsi: ufs-mediatek: Disable reset confirm feature by UniPro

From: Po-Wen Kao <powen.kao@...iatek.com>

In MediaTek UFS platforms, UniPro will not return reset confirm
if it is in POWERDOWN state thus hang issue may happen while disabling
UFSHCI. Simply disable this feature before UniPro leaves POWERDOWN
state.

Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
Signed-off-by: Po-Wen Kao <powen.kao@...iatek.com>
Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/ufs/host/ufs-mediatek.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 8184e871ff8e..348966dbad78 100755
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1079,6 +1079,11 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
 {
 	int err;
 
+	/* Disable reset confirm feature by UniPro */
+	ufshcd_writel(hba,
+		      (ufshcd_readl(hba, REG_UFS_XOUFS_CTRL) & ~0x100),
+		      REG_UFS_XOUFS_CTRL);
+
 	err = ufs_mtk_unipro_set_lpm(hba, true);
 	if (err) {
 		/* Resume UniPro state for following error recovery */
-- 
2.18.0