From: Maxime Chevallier <maxime.chevallier@bootlin.com>
To: davem@davemloft.net
Cc: Maxime Chevallier <maxime.chevallier@bootlin.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
thomas.petazzoni@bootlin.com, Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
linux-arm-kernel@lists.infradead.org,
Horatiu.Vultur@microchip.com, Allan.Nielsen@microchip.com,
UNGLinuxDriver@microchip.com,
Vladimir Oltean <vladimir.oltean@nxp.com>,
Simon Horman <simon.horman@corigine.com>
Subject: [PATCH net v2 2/2] net: phylink: use a dedicated helper to parse usgmii control word
Date: Fri, 9 Jun 2023 10:03:05 +0200 [thread overview]
Message-ID: <20230609080305.546028-3-maxime.chevallier@bootlin.com> (raw)
In-Reply-To: <20230609080305.546028-1-maxime.chevallier@bootlin.com>
Q-USGMII is a derivative of USGMII, that uses a specific formatting for
the control word. The layout is close to the USXGMII control word, but
doesn't support speeds over 1Gbps. Use a dedicated decoding logic for
the USGMII control word, re-using USXGMII definitions but only considering
10/100/1000Mbps speeds
Fixes: 5e61fe157a27 ("net: phy: Introduce QUSGMII PHY mode")
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
V1->V2: - Fix the decoding logic, by dropping the custom, wrong, speed mask
- Fix a typo in the function doc ("expect" -> "except")
- Slightly reword the commit log
drivers/net/phy/phylink.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 590469261b98..b82d66e8dda2 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -3359,6 +3359,41 @@ void phylink_decode_usxgmii_word(struct phylink_link_state *state,
}
EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);
+/**
+ * phylink_decode_usgmii_word() - decode the USGMII word from a MAC PCS
+ * @state: a pointer to a struct phylink_link_state.
+ * @lpa: a 16 bit value which stores the USGMII auto-negotiation word
+ *
+ * Helper for MAC PCS supporting the USGMII protocol and the auto-negotiation
+ * code word. Decode the USGMII code word and populate the corresponding fields
+ * (speed, duplex) into the phylink_link_state structure. The structure for this
+ * word is the same as the USXGMII word, except it only supports speeds up to
+ * 1Gbps.
+ */
+static void phylink_decode_usgmii_word(struct phylink_link_state *state,
+ uint16_t lpa)
+{
+ switch (lpa & MDIO_USXGMII_SPD_MASK) {
+ case MDIO_USXGMII_10:
+ state->speed = SPEED_10;
+ break;
+ case MDIO_USXGMII_100:
+ state->speed = SPEED_100;
+ break;
+ case MDIO_USXGMII_1000:
+ state->speed = SPEED_1000;
+ break;
+ default:
+ state->link = false;
+ return;
+ }
+
+ if (lpa & MDIO_USXGMII_FULL_DUPLEX)
+ state->duplex = DUPLEX_FULL;
+ else
+ state->duplex = DUPLEX_HALF;
+}
+
/**
* phylink_mii_c22_pcs_decode_state() - Decode MAC PCS state from MII registers
* @state: a pointer to a &struct phylink_link_state.
@@ -3396,9 +3431,11 @@ void phylink_mii_c22_pcs_decode_state(struct phylink_link_state *state,
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_QSGMII:
- case PHY_INTERFACE_MODE_QUSGMII:
phylink_decode_sgmii_word(state, lpa);
break;
+ case PHY_INTERFACE_MODE_QUSGMII:
+ phylink_decode_usgmii_word(state, lpa);
+ break;
default:
state->link = false;
--
2.40.1
next prev parent reply other threads:[~2023-06-09 8:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 8:03 [PATCH net v2 0/2] fixes for Q-USGMII speeds and autoneg Maxime Chevallier
2023-06-09 8:03 ` [PATCH net v2 1/2] net: phylink: report correct max speed for QUSGMII Maxime Chevallier
2023-06-09 8:03 ` Maxime Chevallier [this message]
2023-06-09 8:23 ` [PATCH net v2 0/2] fixes for Q-USGMII speeds and autoneg Russell King (Oracle)
2023-06-13 0:00 ` patchwork-bot+netdevbpf
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