linux-kernel - [PATCH v1] scsi: ufs: Disable local LCC in .link_startup

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Date:   Tue, 13 Aug 2019 08:42:50 +0100
From:   Anil Varughese <aniljoy@...ence.com>
To:     <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <pedrom.sousa@...opsys.com>
CC:     <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>, <hare@...e.de>,
        <aniljoy@...ence.com>, <rafalc@...ence.com>, <mparab@...ence.com>,
        <jank@...ence.com>, <vigneshr@...com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v1] scsi: ufs: Disable local LCC in .link_startup_notify() in Cadence UFS

Some UFS devices have issues if LCC is enabled. So we
are setting PA_LOCAL_TX_LCC_Enable to 0 before link
startup which will make sure that both host and device
TX LCC are disabled once link startup is completed.

Signed-off-by: Anil Varughese <aniljoy@...ence.com>
---
 drivers/scsi/ufs/cdns-pltfrm.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index 993519080..b2af04c57 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -77,6 +77,31 @@ static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
 	return cdns_ufs_set_hclkdiv(hba);
 }
 
+/**
+ * Called before and after Link startup is carried out.
+ * @hba: host controller instance
+ * @status: notify stage (pre, post change)
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
+					enum ufs_notify_change_status status)
+{
+	if (status != PRE_CHANGE)
+		return 0;
+
+	/*
+	 * Some UFS devices have issues if LCC is enabled.
+	 * So we are setting PA_Local_TX_LCC_Enable to 0
+	 * before link startup which will make sure that both host
+	 * and device TX LCC are disabled once link startup is
+	 * completed.
+	 */
+	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
+
+	return 0;
+}
+
 /**
  * cdns_ufs_init - performs additional ufs initialization
  * @hba: host controller instance
@@ -114,12 +139,14 @@ static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)
 static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {
 	.name = "cdns-ufs-pltfm",
 	.hce_enable_notify = cdns_ufs_hce_enable_notify,
+	.link_startup_notify = cdns_ufs_link_startup_notify,
 };
 
 static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
 	.name = "cdns-ufs-pltfm",
 	.init = cdns_ufs_init,
 	.hce_enable_notify = cdns_ufs_hce_enable_notify,
+	.link_startup_notify = cdns_ufs_link_startup_notify,
 	.phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
 };
 
-- 
2.15.0