From: Quan Zhou quan.zhou@mediatek.com
[ Upstream commit 2d5630b0c9466ac6549495828aa7dce7424a272a ]
The mt7925 sometimes fails to enter low power mode during suspend. This is caused by the chip firmware sending an additional ACK event to the host after processing the suspend command. Due to timing issues, this event may not reach the host, causing the chip to get stuck. To resolve this, the ACK flag in the suspend command is removed, as it is not needed in the MT7925 architecture. This prevents the firmware from sending the additional ACK event, ensuring the device can reliably enter low power mode during suspend.
Signed-off-by: Quan Zhou quan.zhou@mediatek.com Link: https://patch.msgid.link/d056938144a3a0336c3a4e3cec6f271899f32bf7.1736775666... Signed-off-by: Felix Fietkau nbd@nbd.name Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/mediatek/mt76/mt7925/mcu.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c index e6d053c0cdbd2..8dc5dc0af1b1b 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c @@ -3294,6 +3294,9 @@ int mt7925_mcu_fill_message(struct mt76_dev *mdev, struct sk_buff *skb, else uni_txd->option = MCU_CMD_UNI_EXT_ACK;
+ if (cmd == MCU_UNI_CMD(HIF_CTRL)) + uni_txd->option &= ~MCU_CMD_ACK; + goto exit; }