FAILED: patch "[PATCH] e1000e: Workaround for sporadic MDI error on Meteor Lake" failed to apply to 5.15-stable tree

PATCH [email protected] 1 participant 1 message Apr 5, 2024

Subsystems (3)

Network drivers Stable branch Intel Ethernet

lore

Share & tools

lore

[email protected]

author maintainer

2024-04-05 10:44 UTC #0 lore raw

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 6dbdd4de0362c37e54e8b049781402e5a409e7d0
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024040504-unedited-capture-9d05@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6dbdd4de0362c37e54e8b049781402e5a409e7d0 Mon Sep 17 00:00:00 2001
From: Vitaly Lifshits <[email protected]>
Date: Thu, 4 Jan 2024 16:16:52 +0200
Subject: [PATCH] e1000e: Workaround for sporadic MDI error on Meteor Lake
systems

On some Meteor Lake systems accessing the PHY via the MDIO interface may result in an MDI error. This issue happens sporadically and in most cases a second access to the PHY via the MDIO interface results in success.

As a workaround, introduce a retry counter which is set to 3 on Meteor Lake systems. The driver will only return an error if 3 consecutive PHY access attempts fail. The retry mechanism is disabled in specific flows, where MDI errors are expected.

Fixes cc23f4f0b6b9 ("e1000e: Add support for Meteor Lake")

Co-developed-by Nir Efrati <[email protected]>

Signed-off-by Nir Efrati <[email protected]>

Signed-off-by Vitaly Lifshits <[email protected]>

Tested-by Naama Meir <[email protected]>

Signed-off-by Tony Nguyen <[email protected]>

drivers/net/ethernet/intel/e1000e/hw.h +2 -0

index 1fef6bb5a5fb..4b6e7536170a 100644
@@ -628,6 +628,7 @@ struct e1000_phy_info {
 	u32 id;
 	u32 reset_delay_us;	/* in usec */
 	u32 revision;
+	u32 retry_count;
 
 	enum e1000_media_type media_type;

@@ -644,6 +645,7 @@ struct e1000_phy_info {
 	bool polarity_correction;
 	bool speed_downgraded;
 	bool autoneg_wait_to_complete;
+	bool retry_enabled;
 };
 
 struct e1000_nvm_info {

drivers/net/ethernet/intel/e1000e/ich8lan.c +33 -0

index 19e450a5bd31..d8e97669f31b 100644
@@ -222,11 +222,18 @@ static bool e1000_phy_is_accessible_pchlan(struct e1000_hw *hw)
 	if (hw->mac.type >= e1000_pch_lpt) {
 		/* Only unforce SMBus if ME is not active */
 		if (!(er32(FWSM) & E1000_ICH_FWSM_FW_VALID)) {
+			/* Switching PHY interface always returns MDI error
+			 * so disable retry mechanism to avoid wasting time
+			 */
+			e1000e_disable_phy_retry(hw);
+
 			/* Unforce SMBus mode in PHY */
 			e1e_rphy_locked(hw, CV_SMB_CTRL, &phy_reg);
 			phy_reg &= ~CV_SMB_CTRL_FORCE_SMBUS;
 			e1e_wphy_locked(hw, CV_SMB_CTRL, phy_reg);
 
+			e1000e_enable_phy_retry(hw);
+
 			/* Unforce SMBus mode in MAC */
 			mac_reg = er32(CTRL_EXT);
 			mac_reg &= ~E1000_CTRL_EXT_FORCE_SMBUS;

@@ -310,6 +317,11 @@ static s32 e1000_init_phy_workarounds_pchlan(struct e1000_hw *hw)
 		goto out;
 	}
 
+	/* There is no guarantee that the PHY is accessible at this time
+	 * so disable retry mechanism to avoid wasting time
+	 */
+	e1000e_disable_phy_retry(hw);
+
 	/* The MAC-PHY interconnect may be in SMBus mode.  If the PHY is
 	 * inaccessible and resetting the PHY is not blocked, toggle the
 	 * LANPHYPC Value bit to force the interconnect to PCIe mode.

@@ -380,6 +392,8 @@ static s32 e1000_init_phy_workarounds_pchlan(struct e1000_hw *hw)
 		break;
 	}
 
+	e1000e_enable_phy_retry(hw);
+
 	hw->phy.ops.release(hw);
 	if (!ret_val) {

@@ -449,6 +463,11 @@ static s32 e1000_init_phy_params_pchlan(struct e1000_hw *hw)
 
 	phy->id = e1000_phy_unknown;
 
+	if (hw->mac.type == e1000_pch_mtp) {
+		phy->retry_count = 2;
+		e1000e_enable_phy_retry(hw);
+	}
+
 	ret_val = e1000_init_phy_workarounds_pchlan(hw);
 	if (ret_val)
 		return ret_val;

@@ -1146,6 +1165,11 @@ s32 e1000_enable_ulp_lpt_lp(struct e1000_hw *hw, bool to_sx)
 	if (ret_val)
 		goto out;
 
+	/* Switching PHY interface always returns MDI error
+	 * so disable retry mechanism to avoid wasting time
+	 */
+	e1000e_disable_phy_retry(hw);
+
 	/* Force SMBus mode in PHY */
 	ret_val = e1000_read_phy_reg_hv_locked(hw, CV_SMB_CTRL, &phy_reg);
 	if (ret_val)

@@ -1153,6 +1177,8 @@ s32 e1000_enable_ulp_lpt_lp(struct e1000_hw *hw, bool to_sx)
 	phy_reg |= CV_SMB_CTRL_FORCE_SMBUS;
 	e1000_write_phy_reg_hv_locked(hw, CV_SMB_CTRL, phy_reg);
 
+	e1000e_enable_phy_retry(hw);
+
 	/* Force SMBus mode in MAC */
 	mac_reg = er32(CTRL_EXT);
 	mac_reg |= E1000_CTRL_EXT_FORCE_SMBUS;

@@ -1313,6 +1339,11 @@ static s32 e1000_disable_ulp_lpt_lp(struct e1000_hw *hw, bool force)
 		/* Toggle LANPHYPC Value bit */
 		e1000_toggle_lanphypc_pch_lpt(hw);
 
+	/* Switching PHY interface always returns MDI error
+	 * so disable retry mechanism to avoid wasting time
+	 */
+	e1000e_disable_phy_retry(hw);
+
 	/* Unforce SMBus mode in PHY */
 	ret_val = e1000_read_phy_reg_hv_locked(hw, CV_SMB_CTRL, &phy_reg);
 	if (ret_val) {

@@ -1333,6 +1364,8 @@ static s32 e1000_disable_ulp_lpt_lp(struct e1000_hw *hw, bool force)
 	phy_reg &= ~CV_SMB_CTRL_FORCE_SMBUS;
 	e1000_write_phy_reg_hv_locked(hw, CV_SMB_CTRL, phy_reg);
 
+	e1000e_enable_phy_retry(hw);
+
 	/* Unforce SMBus mode in MAC */
 	mac_reg = er32(CTRL_EXT);
 	mac_reg &= ~E1000_CTRL_EXT_FORCE_SMBUS;

drivers/net/ethernet/intel/e1000e/phy.c +114 ~~-70~~

231 lines not on this page · raw message

drivers/net/ethernet/intel/e1000e/phy.h +2 -0

index c48777d09523..049bb325b4b1 100644
@@ -51,6 +51,8 @@ s32 e1000e_read_phy_reg_bm2(struct e1000_hw *hw, u32 offset, u16 *data);
 s32 e1000e_write_phy_reg_bm2(struct e1000_hw *hw, u32 offset, u16 data);
 void e1000_power_up_phy_copper(struct e1000_hw *hw);
 void e1000_power_down_phy_copper(struct e1000_hw *hw);
+void e1000e_disable_phy_retry(struct e1000_hw *hw);
+void e1000e_enable_phy_retry(struct e1000_hw *hw);
 s32 e1000e_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data);
 s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data);
 s32 e1000_read_phy_reg_hv(struct e1000_hw *hw, u32 offset, u16 *data);