linux-kernel - [PATCH v2 4/7] scsi: hisi_sas: modify hard reset for directed-attached disk

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Message-ID: <1484916324-211630-5-git-send-email-john.garry@huawei.com>
Date:   Fri, 20 Jan 2017 20:45:21 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>
CC:     <linuxarm@...wei.com>, <zhangfei.gao@...aro.org>,
        <xuwei5@...ilicon.com>, <john.garry2@...l.dcu.ie>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <jthumshirn@...e.de>, Xiang Chen <chenxiang66@...ilicon.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v2 4/7] scsi: hisi_sas: modify hard reset for directed-attached disk

From: Xiang Chen <chenxiang66@...ilicon.com>

Correctly set registers in v2 for root PHY hardreset for directly
attached disk.

Signed-off-by: Xiang Chen <chenxiang66@...ilicon.com>
Signed-off-by: John Garry <john.garry@...wei.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
---
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 93fceda..2e776b7 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -207,6 +207,8 @@
 #define TXID_AUTO			(PORT_BASE + 0xb8)
 #define TXID_AUTO_CT3_OFF		1
 #define TXID_AUTO_CT3_MSK		(0x1 << TXID_AUTO_CT3_OFF)
+#define TX_HARDRST_OFF          2
+#define TX_HARDRST_MSK          (0x1 << TX_HARDRST_OFF)
 #define RX_IDAF_DWORD0			(PORT_BASE + 0xc4)
 #define RX_IDAF_DWORD1			(PORT_BASE + 0xc8)
 #define RX_IDAF_DWORD2			(PORT_BASE + 0xcc)
@@ -1078,7 +1080,15 @@ static void stop_phy_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
 
 static void phy_hard_reset_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
 {
+	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
+	u32 txid_auto;
+
 	stop_phy_v2_hw(hisi_hba, phy_no);
+	if (phy->identify.device_type == SAS_END_DEVICE) {
+		txid_auto = hisi_sas_phy_read32(hisi_hba, phy_no, TXID_AUTO);
+		hisi_sas_phy_write32(hisi_hba, phy_no, TXID_AUTO,
+					txid_auto | TX_HARDRST_MSK);
+	}
 	msleep(100);
 	start_phy_v2_hw(hisi_hba, phy_no);
 }
-- 
1.9.1