netdev - [RFC PATCH 4/8] net: pcs: pcs-mtk-lynxi: allow calling with NULL advertising

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Message-ID: <0dcc5efc480b640d184046ba405a44bada88f88b.1699565880.git.daniel@makrotopia.org>
Date: Thu, 9 Nov 2023 21:51:34 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
	Sean Wang <sean.wang@...iatek.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Alexander Couzens <lynxis@...0.eu>,
	Daniel Golle <daniel@...rotopia.org>,
	Philipp Zabel <p.zabel@...gutronix.de>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org
Subject: [RFC PATCH 4/8] net: pcs: pcs-mtk-lynxi: allow calling with NULL
 advertising

Allow calling pcs_config with advertising set to NULL and in this case
keep the previously assigned advertisement.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/pcs/pcs-mtk-lynxi.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/pcs/pcs-mtk-lynxi.c b/drivers/net/pcs/pcs-mtk-lynxi.c
index 6204448d8eac6..1372653c3d422 100644
--- a/drivers/net/pcs/pcs-mtk-lynxi.c
+++ b/drivers/net/pcs/pcs-mtk-lynxi.c
@@ -81,6 +81,7 @@ struct mtk_pcs_lynxi {
 	phy_interface_t		interface;
 	struct			phylink_pcs pcs;
 	u32			flags;
+	int			advertise;
 };
 
 static struct mtk_pcs_lynxi *pcs_to_mtk_pcs_lynxi(struct phylink_pcs *pcs)
@@ -121,11 +122,19 @@ static int mtk_pcs_lynxi_config(struct phylink_pcs *pcs, unsigned int neg_mode,
 	unsigned int rgc3, sgm_mode, bmcr;
 	int advertise, link_timer;
 
-	advertise = phylink_mii_c22_pcs_encode_advertisement(interface,
-							     advertising);
-	if (advertise < 0)
-		return advertise;
+	if (advertising) {
+		advertise = phylink_mii_c22_pcs_encode_advertisement(interface,
+								     advertising);
+		if (advertise < 0)
+			return advertise;
 
+		mpcs->advertise = advertise;
+	} else {
+		if (mpcs->advertise < 0)
+			return -EINVAL;
+
+		advertise = mpcs->advertise;
+	}
 	/* Clearing IF_MODE_BIT0 switches the PCS to BASE-X mode, and
 	 * we assume that fixes it's speed at bitrate = line rate (in
 	 * other words, 1000Mbps or 2500Mbps).
@@ -299,6 +308,7 @@ struct phylink_pcs *mtk_pcs_lynxi_create(struct device *dev,
 	mpcs->pcs.neg_mode = true;
 	mpcs->pcs.poll = true;
 	mpcs->interface = PHY_INTERFACE_MODE_NA;
+	mpcs->advertise = -1;
 
 	return &mpcs->pcs;
 }
-- 
2.42.1