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mt76: fix system recovery routine for MT7915

Browse Source 
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@slashdirt.org>
Link: https://github.com/openwrt/openwrt/pull/19239
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Thibaut VARÈNE 2025-06-26 11:28:06 +02:00 committed by Hauke Mehrtens
parent f754de7e30
commit ad765d3cc4
3 changed files with 114 additions and 0 deletions
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29
package/kernel/mt76/patches/200-wifi_mt76_mt7915_mcu_increase_eeprom_command_timeout.patch Normal file
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@ -0,0 +1,29 @@
From ee6dac9b6b765e8aab5727688463880c52f6193d Mon Sep 17 00:00:00 2001
From: David Bauer <mail@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@david-bauer.net>
Link: https://patch.msgid.link/20250402004528.1036715-2-mail@david-bauer.net
Signed-off-by: Felix Fietkau <nbd@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;
}

29
package/kernel/mt76/patches/201-wifi_mt76_mt7915_mcu_lower_default_timeout.patch Normal file
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@ -0,0 +1,29 @@
From 0534761b76e1b2e3390b345e524ce959f3fa50fb Mon Sep 17 00:00:00 2001
From: David Bauer <mail@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@david-bauer.net>
Link: https://patch.msgid.link/20250402004528.1036715-1-mail@david-bauer.net
Signed-off-by: Felix Fietkau <nbd@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;

56
package/kernel/mt76/patches/202-wifi_mt76_mt7915_mcu_re-init_MCU_before_loading_FW.patch Normal file
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@ -0,0 +1,56 @@
From 79dd14f2e8161b656341b6653261779199aedbe4 Mon Sep 17 00:00:00 2001
From: David Bauer <mail@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@david-bauer.net>
Link: https://patch.msgid.link/20250402004528.1036715-3-mail@david-bauer.net
Signed-off-by: Felix Fietkau <nbd@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));