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Message-ID: <20190813074250.28177-1-aniljoy@cadence.com>
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
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