netdev - [PATCH RFC net-next 4/9] net: pcs: xpcs: clean up reading clause 73 link partner advertisement

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Date: Wed, 17 May 2023 15:12:04 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Jose Abreu <Jose.Abreu@...opsys.com>
Cc: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Subject: [PATCH RFC net-next 4/9] net: pcs: xpcs: clean up reading clause 73
 link partner advertisement

Read the clause 73 link partner advertisement in a loop and then
translate to the ethtool modes.

Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/pcs/pcs-xpcs.c | 39 +++++++++++++++++---------------------
 drivers/net/pcs/pcs-xpcs.h |  3 ---
 2 files changed, 17 insertions(+), 25 deletions(-)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index f19d48c94fe0..b8d69a78f484 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -487,7 +487,7 @@ static int xpcs_aneg_done_c73(struct dw_xpcs *xpcs,
 		return ret;
 
 	if (ret & MDIO_AN_STAT1_COMPLETE) {
-		ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL1);
+		ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_AN_LPA);
 		if (ret < 0)
 			return ret;
 
@@ -506,7 +506,8 @@ static int xpcs_aneg_done_c73(struct dw_xpcs *xpcs,
 static int xpcs_read_lpa_c73(struct dw_xpcs *xpcs,
 			     struct phylink_link_state *state)
 {
-	int ret;
+	u16 lpa[3];
+	int i, ret;
 
 	ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_STAT1);
 	if (ret < 0)
@@ -519,32 +520,26 @@ static int xpcs_read_lpa_c73(struct dw_xpcs *xpcs,
 
 	phylink_set(state->lp_advertising, Autoneg);
 
-	/* Clause 73 outcome */
-	ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL3);
-	if (ret < 0)
-		return ret;
-
-	if (ret & DW_C73_2500KX)
-		phylink_set(state->lp_advertising, 2500baseX_Full);
+	/* Read Clause 73 link partner advertisement */
+	for (i = ARRAY_SIZE(lpa); --i >= 0; ) {
+		ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_AN_LPA + i);
+		if (ret < 0)
+			return ret;
 
-	ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL2);
-	if (ret < 0)
-		return ret;
+		lpa[i] = ret;
+	}
 
-	if (ret & DW_C73_1000KX)
+	if (lpa[2] & DW_C73_2500KX)
+		phylink_set(state->lp_advertising, 2500baseX_Full);
+	if (lpa[1] & DW_C73_1000KX)
 		phylink_set(state->lp_advertising, 1000baseKX_Full);
-	if (ret & DW_C73_10000KX4)
+	if (lpa[1] & DW_C73_10000KX4)
 		phylink_set(state->lp_advertising, 10000baseKX4_Full);
-	if (ret & DW_C73_10000KR)
+	if (lpa[1] & DW_C73_10000KR)
 		phylink_set(state->lp_advertising, 10000baseKR_Full);
-
-	ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL1);
-	if (ret < 0)
-		return ret;
-
-	if (ret & DW_C73_PAUSE)
+	if (lpa[0] & DW_C73_PAUSE)
 		phylink_set(state->lp_advertising, Pause);
-	if (ret & DW_C73_ASYM_PAUSE)
+	if (lpa[0] & DW_C73_ASYM_PAUSE)
 		phylink_set(state->lp_advertising, Asym_Pause);
 
 	linkmode_and(state->lp_advertising, state->lp_advertising,
diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
index 770df50323a0..68c6b5a62088 100644
--- a/drivers/net/pcs/pcs-xpcs.h
+++ b/drivers/net/pcs/pcs-xpcs.h
@@ -32,9 +32,6 @@
 #define DW_SR_AN_ADV1			0x10
 #define DW_SR_AN_ADV2			0x11
 #define DW_SR_AN_ADV3			0x12
-#define DW_SR_AN_LP_ABL1		0x13
-#define DW_SR_AN_LP_ABL2		0x14
-#define DW_SR_AN_LP_ABL3		0x15
 
 /* Clause 73 Defines */
 /* AN_LP_ABL1 */
-- 
2.30.2