scsi: ufs: remove unwanted checks from hibern8 sequence

We are unnecessarily checking for the request/task doorbell status
during hibern8 enter/exit path but it's very important to have the
minimal latencies for hibern8 enter/exit in order to achieve agressive
power management strategies for UFS. So these unecessary checks are moved
out of this hot path.

Change-Id: Ibaeddca7bd516d71eb03b02a1fc1a86f05038f08
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[venkatg@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>

2 files changed, 60 insertions, 1 deletions

diff --git a/include/linux/phy/phy-qcom-ufs.h~HEAD b/include/linux/phy/phy-qcom-ufs.h~HEAD
new file mode 100644
index 000000000000..9d18e9f948e9
--- /dev/null
+++ b/include/linux/phy/phy-qcom-ufs.h~HEAD
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef PHY_QCOM_UFS_H_
+#define PHY_QCOM_UFS_H_
+
+#include "phy.h"
+
+/**
+ * ufs_qcom_phy_enable_ref_clk() - Enable the phy
+ * ref clock.
+ * @phy: reference to a generic phy
+ *
+ * returns 0 for success, and non-zero for error.
+ */
+int ufs_qcom_phy_enable_ref_clk(struct phy *phy);
+
+/**
+ * ufs_qcom_phy_disable_ref_clk() - Disable the phy
+ * ref clock.
+ * @phy: reference to a generic phy.
+ */
+void ufs_qcom_phy_disable_ref_clk(struct phy *phy);
+
+/**
+ * ufs_qcom_phy_enable_dev_ref_clk() - Enable the device
+ * ref clock.
+ * @phy: reference to a generic phy.
+ */
+void ufs_qcom_phy_enable_dev_ref_clk(struct phy *phy);
+
+/**
+ * ufs_qcom_phy_disable_dev_ref_clk() - Disable the device
+ * ref clock.
+ * @phy: reference to a generic phy.
+ */
+void ufs_qcom_phy_disable_dev_ref_clk(struct phy *phy);
+
+int ufs_qcom_phy_enable_iface_clk(struct phy *phy);
+void ufs_qcom_phy_disable_iface_clk(struct phy *phy);
+int ufs_qcom_phy_start_serdes(struct phy *phy);
+int ufs_qcom_phy_set_tx_lane_enable(struct phy *phy, u32 tx_lanes);
+int ufs_qcom_phy_calibrate_phy(struct phy *phy, bool is_rate_B);
+int ufs_qcom_phy_is_pcs_ready(struct phy *phy);
+void ufs_qcom_phy_save_controller_version(struct phy *phy,
+			u8 major, u16 minor, u16 step);
+
+#endif /* PHY_QCOM_UFS_H_ */
diff --git a/include/linux/scsi/ufs/ufshcd.h b/include/linux/scsi/ufs/ufshcd.h
index bb24bcb3bf30..9a35a4cd170a 100644
--- a/include/linux/scsi/ufs/ufshcd.h
+++ b/include/linux/scsi/ufs/ufshcd.h
@@ -771,6 +771,7 @@ int ufshcd_query_descriptor(struct ufs_hba *hba, enum query_opcode opcode,
 
 int ufshcd_hold(struct ufs_hba *hba, bool async);
 void ufshcd_release(struct ufs_hba *hba);
+int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, u64 wait_timeout_us);
 
 /* Wrapper functions for safely calling variant operations */
 static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)
@@ -875,5 +876,4 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba)
 	if (hba->vops && hba->vops->dbg_register_dump)
 		hba->vops->dbg_register_dump(hba);
 }
-
 #endif /* End of Header */