openwrt/target/linux/generic/backport-6.6/790-27-v6.9-net-dsa-mt7530-simplify-link-operations.patch

From 1ca89c2e349d7c5e045911d741dacf4c83d029e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ar=C4=B1n=C3=A7=20=C3=9CNAL?= <arinc.unal@arinc9.com>
Date: Fri, 1 Mar 2024 12:43:05 +0200
Subject: [PATCH 27/30] net: dsa: mt7530: simplify link operations
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The "MT7621 Giga Switch Programming Guide v0.3", "MT7531 Reference Manual
for Development Board v1.0", and "MT7988A Wi-Fi 7 Generation Router
Platform: Datasheet (Open Version) v0.1" documents show that these bits are
enabled at reset:

PMCR_IFG_XMIT(1) (not part of PMCR_LINK_SETTINGS_MASK)
PMCR_MAC_MODE (not part of PMCR_LINK_SETTINGS_MASK)
PMCR_TX_EN
PMCR_RX_EN
PMCR_BACKOFF_EN (not part of PMCR_LINK_SETTINGS_MASK)
PMCR_BACKPR_EN (not part of PMCR_LINK_SETTINGS_MASK)
PMCR_TX_FC_EN
PMCR_RX_FC_EN

These bits also don't exist on the MT7530_PMCR_P(6) register of the switch
on the MT7988 SoC:

PMCR_IFG_XMIT()
PMCR_MAC_MODE
PMCR_BACKOFF_EN
PMCR_BACKPR_EN

Remove the setting of the bits not part of PMCR_LINK_SETTINGS_MASK on
phylink_mac_config as they're already set.

The bit for setting the port on force mode is already done on
mt7530_setup() and mt7531_setup_common(). So get rid of
PMCR_FORCE_MODE_ID() which helped determine which bit to use for the switch
model.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 drivers/net/dsa/mt7530.c | 12 +-----------
 drivers/net/dsa/mt7530.h |  2 --
 2 files changed, 1 insertion(+), 13 deletions(-)

--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2880,23 +2880,13 @@ mt753x_phylink_mac_config(struct dsa_swi
 			  const struct phylink_link_state *state)
 {
 	struct mt7530_priv *priv = ds->priv;
-	u32 mcr_cur, mcr_new;
 
 	if ((port == 5 || port == 6) && priv->info->mac_port_config)
 		priv->info->mac_port_config(ds, port, mode, state->interface);
 
-	mcr_cur = mt7530_read(priv, MT7530_PMCR_P(port));
-	mcr_new = mcr_cur;
-	mcr_new &= ~PMCR_LINK_SETTINGS_MASK;
-	mcr_new |= PMCR_IFG_XMIT(1) | PMCR_MAC_MODE | PMCR_BACKOFF_EN |
-		   PMCR_BACKPR_EN | PMCR_FORCE_MODE_ID(priv->id);
-
 	/* Are we connected to external phy */
 	if (port == 5 && dsa_is_user_port(ds, 5))
-		mcr_new |= PMCR_EXT_PHY;
-
-	if (mcr_new != mcr_cur)
-		mt7530_write(priv, MT7530_PMCR_P(port), mcr_new);
+		mt7530_set(priv, MT7530_PMCR_P(port), PMCR_EXT_PHY);
 }
 
 static void mt753x_phylink_mac_link_down(struct dsa_switch *ds, int port,
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -333,8 +333,6 @@ enum mt7530_vlan_port_acc_frm {
 					 MT7531_FORCE_DPX | \
 					 MT7531_FORCE_RX_FC | \
 					 MT7531_FORCE_TX_FC)
-#define  PMCR_FORCE_MODE_ID(id)		((((id) == ID_MT7531) || ((id) == ID_MT7988)) ?	\
-					 MT7531_FORCE_MODE : PMCR_FORCE_MODE)
 #define  PMCR_LINK_SETTINGS_MASK	(PMCR_TX_EN | PMCR_FORCE_SPEED_1000 | \
 					 PMCR_RX_EN | PMCR_FORCE_SPEED_100 | \
 					 PMCR_TX_FC_EN | PMCR_RX_FC_EN | \