netdev - [PATCH net-next 12/15] net: dsa: mt7530: move enabling port 6 to mt7530_setup

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Date: Sat, 18 Nov 2023 16:13:14 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Landen Chao <Landen.Chao@...iatek.com>,
	DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Russell King <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
	mithat.guner@...ont.com,
	erkin.bozoglu@...ont.com
Subject: [PATCH net-next 12/15] net: dsa: mt7530: move enabling port 6 to mt7530_setup_port6()

Enable port 6 only when port 6 is being used. Update the comment on
mt7530_setup() with a better explanation. Do not set MHWTRAP_MANUAL on
mt7530_setup_port5() as it's already done on mt7530_setup() beforehand.

Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
---
 drivers/net/dsa/mt7530.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 167b340350b3..2608b09d3295 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -420,6 +420,8 @@ mt7530_setup_port6(struct dsa_switch *ds, phy_interface_t interface)
 	struct mt7530_priv *priv = ds->priv;
 	u32 ncpo1, ssc_delta, trgint, xtal;
 
+	mt7530_clear(priv, MT7530_MHWTRAP, MHWTRAP_P6_DIS);
+
 	xtal = mt7530_read(priv, MT7530_MHWTRAP) & HWTRAP_XTAL_MASK;
 
 	switch (interface) {
@@ -910,7 +912,7 @@ static void mt7530_setup_port5(struct dsa_switch *ds, phy_interface_t interface)
 
 	val = mt7530_read(priv, MT7530_MHWTRAP);
 
-	val |= MHWTRAP_MANUAL | MHWTRAP_P5_MAC_SEL | MHWTRAP_P5_DIS;
+	val |= MHWTRAP_P5_MAC_SEL | MHWTRAP_P5_DIS;
 	val &= ~MHWTRAP_P5_RGMII_MODE & ~MHWTRAP_PHY0_SEL;
 
 	switch (priv->p5_intf_sel) {
@@ -2250,9 +2252,11 @@ mt7530_setup(struct dsa_switch *ds)
 		mt7530_rmw(priv, MT7530_TRGMII_RD(i),
 			   RD_TAP_MASK, RD_TAP(16));
 
-	/* Enable port 6 */
+	/* Directly access the PHY registers via C_MDC/C_MDIO. The bit that
+	 * enables modifying the hardware trap must be set for this.
+	 */
 	val = mt7530_read(priv, MT7530_MHWTRAP);
-	val &= ~MHWTRAP_P6_DIS & ~MHWTRAP_PHY_ACCESS;
+	val &= ~MHWTRAP_PHY_ACCESS;
 	val |= MHWTRAP_MANUAL;
 	mt7530_write(priv, MT7530_MHWTRAP, val);
 
-- 
2.40.1