linux-kernel - [PATCH 4.9 02/66] Revert "net: ethernet: stmmac: fix altr_tse

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Date:   Tue, 10 May 2022 15:06:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Machek <pavel@...x.de>,
        Dinh Nguyen <dinguyen@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 02/66] Revert "net: ethernet: stmmac: fix altr_tse_pcs function when using a fixed-link"

This reverts commit edba120f094394454f5b9511d04abd7e8c2c31ee which is
commit a6aaa00324240967272b451bfa772547bd576ee6 upstream.

Pavel reports that it causes boot issues, so revert it for now.

Link: https://lore.kernel.org/r/20220429074341.GB1423@amd
Reported-by: Pavel Machek <pavel@...x.de>
Cc: Dinh Nguyen <dinguyen@...nel.org>
Cc: David S. Miller <davem@...emloft.net>
Cc: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c  |    8 ++++++++
 drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h  |    4 ----
 drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c |   13 ++++++++-----
 3 files changed, 16 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
@@ -68,6 +68,10 @@
 #define TSE_PCS_USE_SGMII_ENA				BIT(0)
 #define TSE_PCS_IF_USE_SGMII				0x03
 
+#define SGMII_ADAPTER_CTRL_REG				0x00
+#define SGMII_ADAPTER_DISABLE				0x0001
+#define SGMII_ADAPTER_ENABLE				0x0000
+
 #define AUTONEGO_LINK_TIMER				20
 
 static int tse_pcs_reset(void __iomem *base, struct tse_pcs *pcs)
@@ -211,8 +215,12 @@ void tse_pcs_fix_mac_speed(struct tse_pc
 			   unsigned int speed)
 {
 	void __iomem *tse_pcs_base = pcs->tse_pcs_base;
+	void __iomem *sgmii_adapter_base = pcs->sgmii_adapter_base;
 	u32 val;
 
+	writew(SGMII_ADAPTER_ENABLE,
+	       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+
 	pcs->autoneg = phy_dev->autoneg;
 
 	if (phy_dev->autoneg == AUTONEG_ENABLE) {
--- a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h
+++ b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h
@@ -21,10 +21,6 @@
 #include <linux/phy.h>
 #include <linux/timer.h>
 
-#define SGMII_ADAPTER_CTRL_REG		0x00
-#define SGMII_ADAPTER_ENABLE		0x0000
-#define SGMII_ADAPTER_DISABLE		0x0001
-
 struct tse_pcs {
 	struct device *dev;
 	void __iomem *tse_pcs_base;
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -29,6 +29,9 @@
 
 #include "altr_tse_pcs.h"
 
+#define SGMII_ADAPTER_CTRL_REG                          0x00
+#define SGMII_ADAPTER_DISABLE                           0x0001
+
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
@@ -62,14 +65,16 @@ static void socfpga_dwmac_fix_mac_speed(
 {
 	struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
 	void __iomem *splitter_base = dwmac->splitter_base;
+	void __iomem *tse_pcs_base = dwmac->pcs.tse_pcs_base;
 	void __iomem *sgmii_adapter_base = dwmac->pcs.sgmii_adapter_base;
 	struct device *dev = dwmac->dev;
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct phy_device *phy_dev = ndev->phydev;
 	u32 val;
 
-	writew(SGMII_ADAPTER_DISABLE,
-	       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+	if ((tse_pcs_base) && (sgmii_adapter_base))
+		writew(SGMII_ADAPTER_DISABLE,
+		       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
 
 	if (splitter_base) {
 		val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
@@ -91,9 +96,7 @@ static void socfpga_dwmac_fix_mac_speed(
 		writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
 	}
 
-	writew(SGMII_ADAPTER_ENABLE,
-	       sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
-	if (phy_dev)
+	if (tse_pcs_base && sgmii_adapter_base)
 		tse_pcs_fix_mac_speed(&dwmac->pcs, phy_dev, speed);
 }