netdev - [PATCH] net: phy: dp83869: fix default value for tx-/rx-internal-delay

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Date:   Thu, 23 Mar 2023 12:25:36 +0200
From:   Josua Mayer <josua@...id-run.com>
To:     netdev@...r.kernel.org
Cc:     Josua Mayer <josua@...id-run.com>,
        Yazan Shhady <yazan.shhady@...id-run.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH] net: phy: dp83869: fix default value for tx-/rx-internal-delay

dp83869 internally uses a look-up table for mapping supported delays in
nanoseconds to register values.
When specific delays are defined in device-tree, phy_get_internal_delay
does the lookup automatically returning an index.

The default case wrongly assigns the nanoseconds value from the lookup
table, resulting in numeric value 2000 applied to delay configuration
register, rather than the expected index values 0-7 (7 for 2000).
Ultimately this issue broke RX for 1Gbps links.

Fix default delay configuration by assigning the intended index value
directly.

Co-developed-by: Yazan Shhady <yazan.shhady@...id-run.com>
Signed-off-by: Yazan Shhady <yazan.shhady@...id-run.com>
Signed-off-by: Josua Mayer <josua@...id-run.com>
---
 drivers/net/phy/dp83869.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
index b4ff9c5073a3c..9ab5eff502b71 100644
--- a/drivers/net/phy/dp83869.c
+++ b/drivers/net/phy/dp83869.c
@@ -588,15 +588,13 @@ static int dp83869_of_init(struct phy_device *phydev)
 						       &dp83869_internal_delay[0],
 						       delay_size, true);
 	if (dp83869->rx_int_delay < 0)
-		dp83869->rx_int_delay =
-				dp83869_internal_delay[DP83869_CLK_DELAY_DEF];
+		dp83869->rx_int_delay = DP83869_CLK_DELAY_DEF;
 
 	dp83869->tx_int_delay = phy_get_internal_delay(phydev, dev,
 						       &dp83869_internal_delay[0],
 						       delay_size, false);
 	if (dp83869->tx_int_delay < 0)
-		dp83869->tx_int_delay =
-				dp83869_internal_delay[DP83869_CLK_DELAY_DEF];
+		dp83869->tx_int_delay = DP83869_CLK_DELAY_DEF;
 
 	return ret;
 }
-- 
2.35.3