linux-kernel - [PATCH v1 1/2] scsi: ufs: ufs-mediatek: fix TX LCC disabling timing

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Date:   Fri, 7 Feb 2020 15:03:56 +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>, <beanhuo@...ron.com>
CC:     <asutoshd@...eaurora.org>, <cang@...eaurora.org>,
        <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>, Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v1 1/2] scsi: ufs: ufs-mediatek: fix TX LCC disabling timing

MediaTek UFS host requires TX LCC to be disabled in both host
and device sides. This can be done by disabling host's local TX LCC
before link startup. Correct TX LCC disabling timing in MediaTek
UFS driver.

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/scsi/ufs/ufs-mediatek.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index 0ce08872d671..8f73c860f423 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -313,6 +313,15 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
 
 	ufs_mtk_unipro_powerdown(hba, 0);
 
+	/*
+	 * Setting PA_Local_TX_LCC_Enable to 0 before link startup
+	 * to make sure that both host and device TX LCC are disabled
+	 * once link startup is completed.
+	 */
+	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
+	if (ret)
+		return ret;
+
 	/* disable deep stall */
 	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
 	if (ret)
@@ -344,9 +353,6 @@ static void ufs_mtk_setup_clk_gating(struct ufs_hba *hba)
 
 static int ufs_mtk_post_link(struct ufs_hba *hba)
 {
-	/* disable device LCC */
-	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
-
 	/* enable unipro clock gating feature */
 	ufs_mtk_cfg_unipro_cg(hba, true);
 
-- 
2.18.0