[PATCH net 2/3] net: dsa: mt7530: move lowering TRGMII driving to mt7530_setup()

[arinc9.unal@gmail.com]

From: Arınç ÜNAL <arinc.unal@arinc9.com>

Move lowering the TRGMII Tx clock driving to mt7530_setup(), after setting
the core clock, as seen on the U-Boot MediaTek ethernet driver.

Move the code which looks like it lowers the TRGMII Rx clock driving to
after the TRGMII Tx clock driving is lowered. This is run after lowering
the Tx clock driving on the U-Boot MediaTek ethernet driver as well.

This way, the switch should consume less power regardless of port 6 being
used.

Update the comment explaining mt7530_pad_clk_setup().

Tested rgmii and trgmii modes of port 6 and rgmii mode of port 5 on MCM
MT7530 on MT7621AT Unielec U7621-06 and standalone MT7530 on MT7623NI
Bananapi BPI-R2.

Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
Link: https://source.denx.de/u-boot/u-boot/-/blob/29a48bf9ccba45a5e560bb564bbe76e42629325f/drivers/net/mtk_eth.c#L682
Tested-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
---

I asked this before, MT7530 DSA driver maintainers, please explain the code
I mentioned on the second paragraph.

I intend to send a patch to remove the maintainers, Sean Wang, Landen Chao
DENG Qingfang, listed on the MAINTAINERS file and change the status to
orphan if none of them respond to this question or review the patches.

I think a full week is a reasonable amount of time to receive a response
from a maintainer.

Arınç

---
 drivers/net/dsa/mt7530.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index d4a559007973..8831bd409a40 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -419,12 +419,12 @@ static void mt7530_pll_setup(struct mt7530_priv *priv)
 	core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
 }
 
-/* Setup TX circuit including relevant PAD and driving */
+/* Setup port 6 interface mode and TRGMII TX circuit */
 static int
 mt7530_pad_clk_setup(struct dsa_switch *ds, phy_interface_t interface)
 {
 	struct mt7530_priv *priv = ds->priv;
-	u32 ncpo1, ssc_delta, trgint, i, xtal;
+	u32 ncpo1, ssc_delta, trgint, xtal;
 
 	xtal = mt7530_read(priv, MT7530_MHWTRAP) & HWTRAP_XTAL_MASK;
 
@@ -469,11 +469,6 @@ mt7530_pad_clk_setup(struct dsa_switch *ds, phy_interface_t interface)
 		   P6_INTF_MODE(trgint));
 
 	if (trgint) {
-		/* Lower Tx Driving for TRGMII path */
-		for (i = 0 ; i < NUM_TRGMII_CTRL ; i++)
-			mt7530_write(priv, MT7530_TRGMII_TD_ODT(i),
-				     TD_DM_DRVP(8) | TD_DM_DRVN(8));
-
 		/* Disable the MT7530 TRGMII clocks */
 		core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_TRGMIICK_EN);
 
@@ -494,10 +489,6 @@ mt7530_pad_clk_setup(struct dsa_switch *ds, phy_interface_t interface)
 
 		/* Enable the MT7530 TRGMII clocks */
 		core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_TRGMIICK_EN);
-	} else {
-		for (i = 0 ; i < NUM_TRGMII_CTRL; i++)
-			mt7530_rmw(priv, MT7530_TRGMII_RD(i),
-				   RD_TAP_MASK, RD_TAP(16));
 	}
 
 	return 0;
@@ -2207,6 +2198,15 @@ mt7530_setup(struct dsa_switch *ds)
 
 	mt7530_pll_setup(priv);
 
+	/* Lower Tx driving for TRGMII path */
+	for (i = 0; i < NUM_TRGMII_CTRL; i++)
+		mt7530_write(priv, MT7530_TRGMII_TD_ODT(i),
+			     TD_DM_DRVP(8) | TD_DM_DRVN(8));
+
+	for (i = 0; i < NUM_TRGMII_CTRL; i++)
+		mt7530_rmw(priv, MT7530_TRGMII_RD(i),
+			   RD_TAP_MASK, RD_TAP(16));
+
 	/* Enable port 6 */
 	val = mt7530_read(priv, MT7530_MHWTRAP);
 	val &= ~MHWTRAP_P6_DIS & ~MHWTRAP_PHY_ACCESS;
-- 
2.37.2