[openwrt/openwrt] mt76: fix system recovery routine for MT7915

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/ad765d3cc4035406a4cd748f3339301ecc19dba8

commit ad765d3cc4035406a4cd748f3339301ecc19dba8
Author: Thibaut VARÈNE <hacks at slashdirt.org>
AuthorDate: Thu Jun 26 11:28:06 2025 +0200

    mt76: fix system recovery routine for MT7915
    
    These patches are part of an mt76 update in main branch.
    
    Link: https://github.com/freifunk-gluon/gluon/pull/3436
    
    Signed-off-by: Thibaut VARÈNE <hacks at slashdirt.org>
    Link: https://github.com/openwrt/openwrt/pull/19239
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 ...t7915_mcu_increase_eeprom_command_timeout.patch | 29 +++++++++++
 ...ifi_mt76_mt7915_mcu_lower_default_timeout.patch | 29 +++++++++++
 ..._mt7915_mcu_re-init_MCU_before_loading_FW.patch | 56 ++++++++++++++++++++++
 3 files changed, 114 insertions(+)

diff --git a/package/kernel/mt76/patches/200-wifi_mt76_mt7915_mcu_increase_eeprom_command_timeout.patch b/package/kernel/mt76/patches/200-wifi_mt76_mt7915_mcu_increase_eeprom_command_timeout.patch
new file mode 100644
index 0000000000..e618e536e6
--- /dev/null
+++ b/package/kernel/mt76/patches/200-wifi_mt76_mt7915_mcu_increase_eeprom_command_timeout.patch
@@ -0,0 +1,29 @@
+From ee6dac9b6b765e8aab5727688463880c52f6193d Mon Sep 17 00:00:00 2001
+From: David Bauer <mail at david-bauer.net>
+Date: Wed, 2 Apr 2025 02:45:26 +0200
+Subject: [PATCH] wifi: mt76: mt7915: mcu: increase eeprom command timeout
+
+Increase the timeout for MCU_EXT_CMD_EFUSE_BUFFER_MODE command.
+
+Regular retries upon hardware-recovery have been observed. Increasing
+the timeout slightly remedies this problem.
+
+Signed-off-by: David Bauer <mail at david-bauer.net>
+Link: https://patch.msgid.link/20250402004528.1036715-2-mail@david-bauer.net
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+ mt7915/mcu.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/mt7915/mcu.c
++++ b/mt7915/mcu.c
+@@ -208,6 +208,9 @@ mt7915_mcu_set_timeout(struct mt76_dev *
+ 	case MCU_EXT_CMD_BSS_INFO_UPDATE:
+ 		mdev->mcu.timeout = 2 * HZ;
+ 		return;
++	case MCU_EXT_CMD_EFUSE_BUFFER_MODE:
++		mdev->mcu.timeout = 10 * HZ;
++		return;
+ 	default:
+ 		break;
+ 	}
diff --git a/package/kernel/mt76/patches/201-wifi_mt76_mt7915_mcu_lower_default_timeout.patch b/package/kernel/mt76/patches/201-wifi_mt76_mt7915_mcu_lower_default_timeout.patch
new file mode 100644
index 0000000000..a624fcfa0a
--- /dev/null
+++ b/package/kernel/mt76/patches/201-wifi_mt76_mt7915_mcu_lower_default_timeout.patch
@@ -0,0 +1,29 @@
+From 0534761b76e1b2e3390b345e524ce959f3fa50fb Mon Sep 17 00:00:00 2001
+From: David Bauer <mail at david-bauer.net>
+Date: Wed, 2 Apr 2025 02:45:25 +0200
+Subject: [PATCH] wifi: mt76: mt7915: mcu: lower default timeout
+
+The default timeout set in mt76_connac2_mcu_fill_message of 20 seconds
+leads to excessive stalling in case messages are lost.
+
+Testing showed that a smaller timeout of 5 seconds is sufficient in
+normal operation.
+
+Signed-off-by: David Bauer <mail at david-bauer.net>
+Link: https://patch.msgid.link/20250402004528.1036715-1-mail@david-bauer.net
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+ mt7915/mcu.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/mt7915/mcu.c
++++ b/mt7915/mcu.c
+@@ -197,6 +197,8 @@ mt7915_mcu_parse_response(struct mt76_de
+ static void
+ mt7915_mcu_set_timeout(struct mt76_dev *mdev, int cmd)
+ {
++	mdev->mcu.timeout = 5 * HZ;
++
+ 	if ((cmd & __MCU_CMD_FIELD_ID) != MCU_CMD_EXT_CID)
+ 		return;
+ 
diff --git a/package/kernel/mt76/patches/202-wifi_mt76_mt7915_mcu_re-init_MCU_before_loading_FW.patch b/package/kernel/mt76/patches/202-wifi_mt76_mt7915_mcu_re-init_MCU_before_loading_FW.patch
new file mode 100644
index 0000000000..76d005fc21
--- /dev/null
+++ b/package/kernel/mt76/patches/202-wifi_mt76_mt7915_mcu_re-init_MCU_before_loading_FW.patch
@@ -0,0 +1,56 @@
+From 79dd14f2e8161b656341b6653261779199aedbe4 Mon Sep 17 00:00:00 2001
+From: David Bauer <mail at david-bauer.net>
+Date: Wed, 2 Apr 2025 02:45:27 +0200
+Subject: [PATCH] wifi: mt76: mt7915: mcu: re-init MCU before loading FW patch
+
+Restart the MCU and release the patch semaphore before loading the MCU
+patch firmware from the host.
+
+This fixes failures upon error recovery in case the semaphore was
+previously taken and never released by the host.
+
+This happens from time to time upon triggering a full-chip error
+recovery. Under this circumstance, the hardware restart fails and the
+radio is rendered inoperational.
+
+Signed-off-by: David Bauer <mail at david-bauer.net>
+Link: https://patch.msgid.link/20250402004528.1036715-3-mail@david-bauer.net
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+ mt7915/mcu.c | 25 +++++++++++++++----------
+ 1 file changed, 15 insertions(+), 10 deletions(-)
+
+--- a/mt7915/mcu.c
++++ b/mt7915/mcu.c
+@@ -2097,16 +2097,21 @@ static int mt7915_load_firmware(struct m
+ {
+ 	int ret;
+ 
+-	/* make sure fw is download state */
+-	if (mt7915_firmware_state(dev, false)) {
+-		/* restart firmware once */
+-		mt76_connac_mcu_restart(&dev->mt76);
+-		ret = mt7915_firmware_state(dev, false);
+-		if (ret) {
+-			dev_err(dev->mt76.dev,
+-				"Firmware is not ready for download\n");
+-			return ret;
+-		}
++	/* Release Semaphore if taken by previous failed attempt */
++	ret = mt76_connac_mcu_patch_sem_ctrl(&dev->mt76, false);
++	if (ret != PATCH_REL_SEM_SUCCESS) {
++		dev_err(dev->mt76.dev, "Could not release semaphore\n");
++		/* Continue anyways */
++	}
++
++	/* Always restart MCU firmware */
++	mt76_connac_mcu_restart(&dev->mt76);
++
++	/* Check if MCU is ready */
++	ret = mt7915_firmware_state(dev, false);
++	if (ret) {
++		dev_err(dev->mt76.dev, "Firmware did not enter download state\n");
++		return ret;
+ 	}
+ 
+ 	ret = mt76_connac2_load_patch(&dev->mt76, fw_name_var(dev, ROM_PATCH));