linux-kernel - [PATCH v2] net: phy: realtek: read actual speed on rtl8211f to detect downshift

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Message-ID: <20201124215932.885306-1-antonio.borneo@st.com>
Date:   Tue, 24 Nov 2020 22:59:32 +0100
From:   Antonio Borneo <antonio.borneo@...com>
To:     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>, <netdev@...r.kernel.org>,
        Yonglong Liu <liuyonglong@...wei.com>,
        Willy Liu <willy.liu@...ltek.com>
CC:     Antonio Borneo <antonio.borneo@...com>, <linuxarm@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] net: phy: realtek: read actual speed on rtl8211f to detect downshift

The rtl8211f supports downshift and before commit 5502b218e001
("net: phy: use phy_resolve_aneg_linkmode in genphy_read_status")
the read-back of register MII_CTRL1000 was used to detect the
negotiated link speed.
The code added in commit d445dff2df60 ("net: phy: realtek: read
actual speed to detect downshift") is working fine also for this
phy and it's trivial re-using it to restore the downshift
detection on rtl8211f.

Add the phy specific read_status() pointing to the existing
function rtlgen_read_status().

Signed-off-by: Antonio Borneo <antonio.borneo@...com>
Link: https://lore.kernel.org/r/478f871a-583d-01f1-9cc5-2eea56d8c2a7@huawei.com
---
To: Andrew Lunn <andrew@...n.ch>
To: Heiner Kallweit <hkallweit1@...il.com>
To: Russell King <linux@...linux.org.uk>
To: "David S. Miller" <davem@...emloft.net>
To: Jakub Kicinski <kuba@...nel.org>
To: netdev@...r.kernel.org
To: Yonglong Liu <liuyonglong@...wei.com>
To: Willy Liu <willy.liu@...ltek.com>
Cc: linuxarm@...wei.com
Cc: Salil Mehta <salil.mehta@...wei.com>
Cc: linux-stm32@...md-mailman.stormreply.com
Cc: linux-kernel@...r.kernel.org
In-Reply-To: <20201124143848.874894-1-antonio.borneo@...com>

V1 => V2
	move from a generic implementation affecting every phy
	to a rtl8211f specific implementation
---
 drivers/net/phy/realtek.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 575580d3ffe0..8ff8a4edc173 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -621,6 +621,7 @@ static struct phy_driver realtek_drvs[] = {
 		PHY_ID_MATCH_EXACT(0x001cc916),
 		.name		= "RTL8211F Gigabit Ethernet",
 		.config_init	= &rtl8211f_config_init,
+		.read_status	= rtlgen_read_status,
 		.ack_interrupt	= &rtl8211f_ack_interrupt,
 		.config_intr	= &rtl8211f_config_intr,
 		.suspend	= genphy_suspend,

base-commit: 9bd2702d292cb7b565b09e949d30288ab7a26d51
-- 
2.29.2