linux-kernel - [PATCH net] net: phy: broadcom: Fix RGMII delays for BCM50160 and BCM50610M

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Message-Id: <20210312005251.3353889-1-f.fainelli@gmail.com>
Date:   Thu, 11 Mar 2021 16:52:50 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Abhishek Shah <abhishek.shah@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com (open list:BROADCOM ETHERNET PHY
        DRIVERS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] net: phy: broadcom: Fix RGMII delays for BCM50160 and BCM50610M

The PHY driver entry for BCM50160 and BCM50610M calls
bcm54xx_config_init() but does not call bcm54xx_config_clock_delay() in
order to configuration appropriate clock delays on the PHY, fix that.

Fixes: 733336262b28 ("net: phy: Allow BCM5481x PHYs to setup internal TX/RX clock delay")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Hi,

More (all) PHY entries that support RGMII should arguably do the same
thing here but given that we had a bad history of seeing broken
DTS/DTBs, I prefer to take a conservative approach here and submit a
localized fix to the hardware I just had to test this on.

While this dates back to before the commit in Fixes tag, that commit
introduces the bcm54xx_config_clock_delay() function and would make it
go far enough for stable back ports.

 drivers/net/phy/broadcom.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index fa0be591ae79..4c2f8bb51eef 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -342,6 +342,10 @@ static int bcm54xx_config_init(struct phy_device *phydev)
 	bcm54xx_adjust_rxrefclk(phydev);
 
 	switch (BRCM_PHY_MODEL(phydev)) {
+	case PHY_ID_BCM50610:
+	case PHY_ID_BCM50610M:
+		err = bcm54xx_config_clock_delay(phydev);
+		break;
 	case PHY_ID_BCM54210E:
 		err = bcm54210e_config_init(phydev);
 		break;
-- 
2.25.1