linux-kernel - [PATCH net v3 1/1] net: phy: nxp-c45-tja11xx: fix the PTP interrupt enablig/disabling

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Message-Id: <20230619132851.233976-1-radu-nicolae.pirea@oss.nxp.com>
Date:   Mon, 19 Jun 2023 16:28:51 +0300
From:   "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
To:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, richardcochran@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        sebastian.tobuschat@....com,
        "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>,
        stable@...r.kernel.org
Subject: [PATCH net v3 1/1] net: phy: nxp-c45-tja11xx: fix the PTP interrupt enablig/disabling

.config_intr() handles only the link event interrupt and should
disable/enable the PTP interrupt also.

It's safe to disable/enable the PTP irq even if the egress ts irq
is disabled. This interrupt, the PTP one, acts as a global switch for all
PTP irqs.

Fixes: 514def5dd339 ("phy: nxp-c45-tja11xx: add timestamping support")
CC: stable@...r.kernel.org # 5.15+
Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@....nxp.com>
---

Where is V1?
https://patchwork.kernel.org/project/netdevbpf/patch/20230410124856.287753-1-radu-nicolae.pirea@oss.nxp.com/

Where is V2?
https://patchwork.kernel.org/project/netdevbpf/patch/20230616135323

 drivers/net/phy/nxp-c45-tja11xx.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c
index 029875a59ff8..f0d047019f33 100644
--- a/drivers/net/phy/nxp-c45-tja11xx.c
+++ b/drivers/net/phy/nxp-c45-tja11xx.c
@@ -63,6 +63,9 @@
 #define VEND1_PORT_ABILITIES		0x8046
 #define PTP_ABILITY			BIT(3)
 
+#define VEND1_PORT_FUNC_IRQ_EN		0x807A
+#define PTP_IRQS			BIT(3)
+
 #define VEND1_PORT_INFRA_CONTROL	0xAC00
 #define PORT_INFRA_CONTROL_EN		BIT(14)
 
@@ -890,12 +893,26 @@ static int nxp_c45_start_op(struct phy_device *phydev)
 
 static int nxp_c45_config_intr(struct phy_device *phydev)
 {
-	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+	int ret;
+
+	/* 0x807A register is not present on SJA1110 PHYs. */
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
+		ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
+				       VEND1_PORT_FUNC_IRQ_EN, PTP_IRQS);
+		if (ret)
+			return ret;
+
 		return phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
 					VEND1_PHY_IRQ_EN, PHY_IRQ_LINK_EVENT);
-	else
+	} else {
+		ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
+					 VEND1_PORT_FUNC_IRQ_EN, PTP_IRQS);
+		if (ret)
+			return ret;
+
 		return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
 					  VEND1_PHY_IRQ_EN, PHY_IRQ_LINK_EVENT);
+	}
 }
 
 static irqreturn_t nxp_c45_handle_interrupt(struct phy_device *phydev)
-- 
2.34.1