wifi: mt76: mt792x: fix firmware reload failure after previous load crash #1040
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…rash If the firmware loading process crashes or is interrupted after acquiring the patch semaphore but before releasing it, subsequent firmware load attempts will fail with 'Failed to get patch semaphore' because the semaphore is still held. This issue manifests as devices becoming unusable after suspend/resume failures or firmware crashes, requiring a full hardware reboot to recover. This has been widely reported on MT7921 and MT7925 devices. Apply the same fix that was applied to MT7915 in commit 79dd14f: 1. Release the patch semaphore before starting firmware load (in case it was held by a previous failed attempt) 2. Restart MCU firmware to ensure clean state 3. Wait briefly for MCU to be ready This fix applies to both MT7921 and MT7925 drivers which share the mt792x_load_firmware() function. Fixes: 'Failed to get patch semaphore' errors after firmware crash Signed-off-by: Zac Bowling <zac@zacbowling.com>
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Applies same fix as MT7915 commit 79dd14f - release semaphore and restart MCU before loading firmware to recover from failed previous load attempts. Fixes 'Failed to get patch semaphore' errors that leave WiFi unusable after firmware crashes or suspend/resume failures. OpenWrt PR: openwrt/mt76#1040
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If the firmware loading process crashes or is interrupted after
acquiring the patch semaphore but before releasing it, subsequent
firmware load attempts will fail with
Failed to get patch semaphorebecause the semaphore is still held.
This issue manifests as devices becoming unusable after suspend/resume
failures or firmware crashes, requiring a full hardware reboot to
recover. This has been widely reported on MT7921 and MT7925 devices.
Apply the same fix that was applied to MT7915 in commit 79dd14f:
it was held by a previous failed attempt)
This fix applies to both MT7921 and MT7925 drivers which share the
mt792x_load_firmware()function.Fixes: "Failed to get patch semaphore" errors after firmware crash
Related issues:
Reference: MT7915 fix commit 79dd14f