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Date:   Thu, 21 May 2020 22:03:08 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net] r8169: fix OCP access on RTL8117

According to r8168 vendor driver DASHv3 chips like RTL8168fp/RTL8117
need a special addressing for OCP access.
Fix is compile-tested only due to missing test hardware.

Fixes: 1287723aa139 ("r8169: add support for RTL8117")
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
- applies on net-next with a bit of fuzz
---
 drivers/net/ethernet/realtek/r8169_main.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 78e15cc00..c51b48dc3 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -1050,6 +1050,13 @@ static u16 rtl_ephy_read(struct rtl8169_private *tp, int reg_addr)
 		RTL_R32(tp, EPHYAR) & EPHYAR_DATA_MASK : ~0;
 }
 
+static void r8168fp_adjust_ocp_cmd(struct rtl8169_private *tp, u32 *cmd, int type)
+{
+	/* based on RTL8168FP_OOBMAC_BASE in vendor driver */
+	if (tp->mac_version == RTL_GIGA_MAC_VER_52 && type == ERIAR_OOB)
+		*cmd |= 0x7f0 << 18;
+}
+
 DECLARE_RTL_COND(rtl_eriar_cond)
 {
 	return RTL_R32(tp, ERIAR) & ERIAR_FLAG;
@@ -1058,9 +1065,12 @@ DECLARE_RTL_COND(rtl_eriar_cond)
 static void _rtl_eri_write(struct rtl8169_private *tp, int addr, u32 mask,
 			   u32 val, int type)
 {
+	u32 cmd = ERIAR_WRITE_CMD | type | mask | addr;
+
 	BUG_ON((addr & 3) || (mask == 0));
 	RTL_W32(tp, ERIDR, val);
-	RTL_W32(tp, ERIAR, ERIAR_WRITE_CMD | type | mask | addr);
+	r8168fp_adjust_ocp_cmd(tp, &cmd, type);
+	RTL_W32(tp, ERIAR, cmd);
 
 	rtl_udelay_loop_wait_low(tp, &rtl_eriar_cond, 100, 100);
 }
@@ -1073,7 +1083,10 @@ static void rtl_eri_write(struct rtl8169_private *tp, int addr, u32 mask,
 
 static u32 _rtl_eri_read(struct rtl8169_private *tp, int addr, int type)
 {
-	RTL_W32(tp, ERIAR, ERIAR_READ_CMD | type | ERIAR_MASK_1111 | addr);
+	u32 cmd = ERIAR_READ_CMD | type | ERIAR_MASK_1111 | addr;
+
+	r8168fp_adjust_ocp_cmd(tp, &cmd, type);
+	RTL_W32(tp, ERIAR, cmd);
 
 	return rtl_udelay_loop_wait_high(tp, &rtl_eriar_cond, 100, 100) ?
 		RTL_R32(tp, ERIDR) : ~0;
-- 
2.26.2

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