linux-kernel - [PATCH v2] scsi: ufs: Configure clock in .hce_enable

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Date:   Fri, 2 Aug 2019 12:21:12 +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>, <pawell@...ence.com>, <vigneshr@...com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] scsi: ufs: Configure clock in .hce_enable_notify() in Cadence UFS

Configure CDNS_UFS_REG_HCLKDIV in .hce_enable_notify() instead of
.setup_clock() because if UFSHCD resets the controller ip because
of phy or device related errors then CDNS_UFS_REG_HCLKDIV is
reset to default value and .setup_clock() is not called later
in the sequence whereas .hce_enable_notify will be called everytime
controller is reenabled.

Signed-off-by: Anil Varughese <aniljoy@...ence.com>
---
 drivers/scsi/ufs/cdns-pltfrm.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index 86dbb723f..993519080 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -62,17 +62,16 @@ static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
 }
 
 /**
- * Sets clocks used by the controller
+ * Called before and after HCE enable bit is set.
  * @hba: host controller instance
- * @on: if true, enable clocks, otherwise disable
  * @status: notify stage (pre, post change)
  *
  * Return zero for success and non-zero for failure
  */
-static int cdns_ufs_setup_clocks(struct ufs_hba *hba, bool on,
-				 enum ufs_notify_change_status status)
+static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
+				      enum ufs_notify_change_status status)
 {
-	if ((!on) || (status == PRE_CHANGE))
+	if (status != PRE_CHANGE)
 		return 0;
 
 	return cdns_ufs_set_hclkdiv(hba);
@@ -114,13 +113,13 @@ 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",
-	.setup_clocks = cdns_ufs_setup_clocks,
+	.hce_enable_notify = cdns_ufs_hce_enable_notify,
 };
 
 static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
 	.name = "cdns-ufs-pltfm",
 	.init = cdns_ufs_init,
-	.setup_clocks = cdns_ufs_setup_clocks,
+	.hce_enable_notify = cdns_ufs_hce_enable_notify,
 	.phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
 };
 
-- 
2.15.0