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authorArınç ÜNAL2024-04-08 10:08:53 +0300
committerJakub Kicinski2024-04-10 18:29:01 -0700
commit06dfcd4098cfdc4d4577d94793a4f9125386da8b (patch)
tree91ba02da0727f15f0067a0a4c787758c58d05f6a /drivers
parent19fa4f2a85d777a8052e869c1b892a2f7556569d (diff)
net: dsa: mt7530: fix enabling EEE on MT7531 switch on all boards
The commit 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features") brought EEE support but did not enable EEE on MT7531 switch MACs. EEE is enabled on MT7531 switch MACs by pulling the LAN2LED0 pin low on the board (bootstrapping), unsetting the EEE_DIS bit on the trap register, or setting the internal EEE switch bit on the CORE_PLL_GROUP4 register. Thanks to SkyLake Huang (黃啟澤) from MediaTek for providing information on the internal EEE switch bit. There are existing boards that were not designed to pull the pin low. Because of that, the EEE status currently depends on the board design. The EEE_DIS bit on the trap pertains to the LAN2LED0 pin which is usually used to control an LED. Once the bit is unset, the pin will be low. That will make the active low LED turn on. The pin is controlled by the switch PHY. It seems that the PHY controls the pin in the way that it inverts the pin state. That means depending on the wiring of the LED connected to LAN2LED0 on the board, the LED may be on without an active link. To not cause this unwanted behaviour whilst enabling EEE on all boards, set the internal EEE switch bit on the CORE_PLL_GROUP4 register. My testing on MT7531 shows a certain amount of traffic loss when EEE is enabled. That said, I haven't come across a board that enables EEE. So enable EEE on the switch MACs but disable EEE advertisement on the switch PHYs. This way, we don't change the behaviour of the majority of the boards that have this switch. The mediatek-ge PHY driver already disables EEE advertisement on the switch PHYs but my testing shows that it is somehow enabled afterwards. Disabling EEE advertisement before the PHY driver initialises keeps it off. With this change, EEE can now be enabled using ethtool. Fixes: 40b5d2f15c09 ("net: dsa: mt7530: Add support for EEE features") Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com> Tested-by: Daniel Golle <daniel@makrotopia.org> Reviewed-by: Daniel Golle <daniel@makrotopia.org> Link: https://lore.kernel.org/r/20240408-for-net-mt7530-fix-eee-for-mt7531-mt7988-v3-1-84fdef1f008b@arinc9.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/dsa/mt7530.c17
-rw-r--r--drivers/net/dsa/mt7530.h1
2 files changed, 13 insertions, 5 deletions
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 1035820c2377..451ff0620c2e 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2505,18 +2505,25 @@ mt7531_setup(struct dsa_switch *ds)
mt7530_rmw(priv, MT7531_GPIO_MODE0, MT7531_GPIO0_MASK,
MT7531_GPIO0_INTERRUPT);
- /* Enable PHY core PLL, since phy_device has not yet been created
- * provided for phy_[read,write]_mmd_indirect is called, we provide
- * our own mt7531_ind_mmd_phy_[read,write] to complete this
- * function.
+ /* Enable Energy-Efficient Ethernet (EEE) and PHY core PLL, since
+ * phy_device has not yet been created provided for
+ * phy_[read,write]_mmd_indirect is called, we provide our own
+ * mt7531_ind_mmd_phy_[read,write] to complete this function.
*/
val = mt7531_ind_c45_phy_read(priv, MT753X_CTRL_PHY_ADDR,
MDIO_MMD_VEND2, CORE_PLL_GROUP4);
- val |= MT7531_PHY_PLL_BYPASS_MODE;
+ val |= MT7531_RG_SYSPLL_DMY2 | MT7531_PHY_PLL_BYPASS_MODE;
val &= ~MT7531_PHY_PLL_OFF;
mt7531_ind_c45_phy_write(priv, MT753X_CTRL_PHY_ADDR, MDIO_MMD_VEND2,
CORE_PLL_GROUP4, val);
+ /* Disable EEE advertisement on the switch PHYs. */
+ for (i = MT753X_CTRL_PHY_ADDR;
+ i < MT753X_CTRL_PHY_ADDR + MT7530_NUM_PHYS; i++) {
+ mt7531_ind_c45_phy_write(priv, i, MDIO_MMD_AN, MDIO_AN_EEE_ADV,
+ 0);
+ }
+
mt7531_setup_common(ds);
/* Setup VLAN ID 0 for VLAN-unaware bridges */
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index d17b318e6ee4..9439db495001 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -616,6 +616,7 @@ enum mt7531_clk_skew {
#define RG_SYSPLL_DDSFBK_EN BIT(12)
#define RG_SYSPLL_BIAS_EN BIT(11)
#define RG_SYSPLL_BIAS_LPF_EN BIT(10)
+#define MT7531_RG_SYSPLL_DMY2 BIT(6)
#define MT7531_PHY_PLL_OFF BIT(5)
#define MT7531_PHY_PLL_BYPASS_MODE BIT(4)