scsi: hisi_sas: ignore the error code between phy down to phy up

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

Several error code will generate between phy down to phy up.
This issue was instroduced by SoC design, So SoC guys come to
a conclusion that we should ignore these several error code.
(number of error code is usually under three).
Signed-off-by: NJiaxing Luo <luojiaxing@huawei.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>

Feature or Bugfix:Bugfix
Signed-off-by: Nluojiaxing <luojiaxing@huawei.com>
Reviewed-by: Nchenxiang <chenxiang66@hisilicon.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -970,8 +970,14 @@ static void enable_phy_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
 static void disable_phy_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
 {
 	u32 cfg = hisi_sas_phy_read32(hisi_hba, phy_no, PHY_CFG);
+	u32 irq_msk = hisi_sas_phy_read32(hisi_hba, phy_no, CHL_INT2_MSK);
+	static const u32 msk = BIT(CHL_INT2_RX_DISP_ERR_OFF) |
+			       BIT(CHL_INT2_RX_CODE_ERR_OFF) |
+			       BIT(CHL_INT2_RX_INVLD_DW_OFF);
 	u32 state;
 
+	hisi_sas_phy_write32(hisi_hba, phy_no, CHL_INT2_MSK, msk | irq_msk);
+
 	cfg &= ~PHY_CFG_ENA_MSK;
 	hisi_sas_phy_write32(hisi_hba, phy_no, PHY_CFG, cfg);
 
@@ -983,6 +989,20 @@ static void disable_phy_v3_hw(struct hisi_hba *hisi_hba, int phy_no)
 		cfg |= PHY_CFG_PHY_RST_MSK;
 		hisi_sas_phy_write32(hisi_hba, phy_no, PHY_CFG, cfg);
 	}
+
+	/*
+	 * Wait 1us till all misleading error code to have occured
+	 */
+	udelay(1);
+
+	hisi_sas_phy_read32(hisi_hba, phy_no, ERR_CNT_INVLD_DW);
+	hisi_sas_phy_read32(hisi_hba, phy_no, ERR_CNT_DISP_ERR);
+	hisi_sas_phy_read32(hisi_hba, phy_no, ERR_CNT_CODE_ERR);
+
+	hisi_sas_phy_write32(hisi_hba, phy_no, CHL_INT2, msk);
+
+	irq_msk = hisi_sas_phy_read32(hisi_hba, phy_no, CHL_INT2_MSK);
+	hisi_sas_phy_write32(hisi_hba, phy_no, CHL_INT2_MSK, (~msk) & irq_msk);
 }
 
 static void start_phy_v3_hw(struct hisi_hba *hisi_hba, int phy_no)