linux-kernel - [PATCH v1 1/5] scsi; ufs: add device descriptor for Host Performance Booster

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Date:   Sat, 21 Mar 2020 01:41:52 +0100
From:   huobean@...il.com
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        ymhungry.lee@...sung.com, j-young.choi@...sung.com
Subject: [PATCH v1 1/5] scsi; ufs: add device descriptor for Host Performance Booster

From: Bean Huo <beanhuo@...ron.com>

HPB support is specified by Bit7 of bUFSFeatureSupport,
HPB version is indicated by wHPBVersion and the HPB Control
Mode is specified by bHPBControl in UFS device descriptor.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/scsi/ufs/ufs.h    | 10 ++++++++++
 drivers/scsi/ufs/ufshcd.c | 11 +++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index b7fec5c73688..31011d86610b 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -258,6 +258,12 @@ enum device_desc_param {
 	DEVICE_DESC_PARAM_PSA_MAX_DATA		= 0x25,
 	DEVICE_DESC_PARAM_PSA_TMT		= 0x29,
 	DEVICE_DESC_PARAM_PRDCT_REV		= 0x2A,
+	DEVICE_DESC_PARAM_HPB_VER		= 0x40,
+	DEVICE_DESC_PARAM_HPB_CTRL_MODE		= 0x42,
+	DEVICE_DESC_PARAM_EXT_UFS_FEAT		= 0x4F,
+	DEVICE_DESC_PARAM_WBB_USER_SPEC_EN	= 0x53,
+	DEVICE_DESC_PARAM_WBB_TYPE		= 0x54,
+	DEVICE_DESC_PARAM_WBB_SHARED_NUM	= 0x55,
 };
 
 /* Interconnect descriptor parameters offsets in bytes*/
@@ -537,6 +543,10 @@ struct ufs_dev_info {
 	u8 *model;
 	u16 wspecversion;
 	u32 clk_gating_wait_us;
+	/* HPB Version */
+	u16 hpb_ver;
+	/* bHPBControl */
+	u8 hpb_control_mode;
 };
 
 /**
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 2a2a63b68a67..492e4685e587 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6559,6 +6559,17 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
 		goto out;
 	}
 
+	if (desc_buf[DEVICE_DESC_PARAM_UFS_FEAT] & 0x80) {
+		hba->dev_info.hpb_control_mode =
+			desc_buf[DEVICE_DESC_PARAM_HPB_CTRL_MODE];
+		hba->dev_info.hpb_ver =
+			(u16) (desc_buf[DEVICE_DESC_PARAM_HPB_VER] << 8) |
+			desc_buf[DEVICE_DESC_PARAM_HPB_VER + 1];
+		dev_info(hba->dev, "HPB Version: 0x%2x\n",
+			 hba->dev_info.hpb_ver);
+		dev_info(hba->dev, "HPB control mode: %d\n",
+			 hba->dev_info.hpb_control_mode);
+	}
 	/*
 	 * getting vendor (manufacturerID) and Bank Index in big endian
 	 * format
-- 
2.17.1