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From:   Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
To:     <netdev@vger.kernel.org>
CC:     <davem@davemloft.net>, <kuba@kernel.org>,
        <linux-kernel@vger.kernel.org>, <andrew@lunn.ch>,
        <Jose.Abreu@synopsys.com>, <linux@armlinux.org.uk>,
        <fancer.lancer@gmail.com>, <UNGLinuxDriver@microchip.com>
Subject: [PATCH net-next V1] net: pcs: xpcs: Add 2500BASE-X case in get state for XPCS drivers
Date:   Thu, 26 Oct 2023 11:13:05 +0530
Message-ID: <20231026054305.336968-1-Raju.Lakkaraju@microchip.com>
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Add DW_2500BASEX case in xpcs_get_state( ) to update speed, duplex and pause

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
---
Change List:
============
V0 -> V1:
  - Remove the auto-negotiation check due to currently the DW_2500BASEX mode 
    doesn't imply any auto-negotiation 

 drivers/net/pcs/pcs-xpcs.c | 29 +++++++++++++++++++++++++++++
 drivers/net/pcs/pcs-xpcs.h |  2 ++
 2 files changed, 31 insertions(+)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 4dbc21f604f2..f5e1dcac9e3e 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -1090,6 +1090,28 @@ static int xpcs_get_state_c37_1000basex(struct dw_xpcs *xpcs,
 	return 0;
 }
 
+static int xpcs_get_state_2500basex(struct dw_xpcs *xpcs,
+				    struct phylink_link_state *state)
+{
+	int sts;
+
+	sts = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_STS);
+
+	state->link = !!(sts & DW_VR_MII_MMD_STS_LINK_STS);
+	if (!state->link) {
+		state->speed = SPEED_UNKNOWN;
+		state->pause = MLO_PAUSE_NONE;
+		state->duplex = DUPLEX_UNKNOWN;
+		return 0;
+	}
+
+	state->speed = SPEED_2500;
+	state->pause |= MLO_PAUSE_TX | MLO_PAUSE_RX;
+	state->duplex = DUPLEX_FULL;
+
+	return 0;
+}
+
 static void xpcs_get_state(struct phylink_pcs *pcs,
 			   struct phylink_link_state *state)
 {
@@ -1127,6 +1149,13 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
 			       ERR_PTR(ret));
 		}
 		break;
+	case DW_2500BASEX:
+		ret = xpcs_get_state_2500basex(xpcs, state);
+		if (ret) {
+			pr_err("xpcs_get_state_2500basex returned %pe\n",
+			       ERR_PTR(ret));
+		}
+		break;
 	default:
 		return;
 	}
diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
index 39a90417e535..96c36b32ca99 100644
--- a/drivers/net/pcs/pcs-xpcs.h
+++ b/drivers/net/pcs/pcs-xpcs.h
@@ -55,6 +55,8 @@
 /* Clause 37 Defines */
 /* VR MII MMD registers offsets */
 #define DW_VR_MII_MMD_CTRL		0x0000
+#define DW_VR_MII_MMD_STS		0x0001
+#define DW_VR_MII_MMD_STS_LINK_STS	BIT(2)
 #define DW_VR_MII_DIG_CTRL1		0x8000
 #define DW_VR_MII_AN_CTRL		0x8001
 #define DW_VR_MII_AN_INTR_STS		0x8002
-- 
2.34.1