[PATCH] wifi: mt76: mt7921e: fix init command fail with enabled device

[PATCH] wifi: mt76: mt7921e: fix init command fail with enabled device

[Deren Wu]

From: Quan Zhou <quan.zhou@mediatek.com>

For some cases as below, we may encounter the unpreditable chip stats
in driver probe()
* The system reboot flow do not work properly, such as kernel oops while
  rebooting, and then the driver do not go back to default status at
  this moment.
* Similar to the flow above. If the device was enabled in BIOS or UEFI,
  the system may switch to Linux without driver fully shutdown.

To avoid the problem, force push the device back to default in probe()
* mt7921e_mcu_fw_pmctrl() : return control privilege to chip side.
* mt7921_wfsys_reset()    : cleanup chip config before resource init.

Error log
[59007.600714] mt7921e 0000:02:00.0: ASIC revision: 79220010
[59010.889773] mt7921e 0000:02:00.0: Message 00000010 (seq 1) timeout
[59010.889786] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59014.217839] mt7921e 0000:02:00.0: Message 00000010 (seq 2) timeout
[59014.217852] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59017.545880] mt7921e 0000:02:00.0: Message 00000010 (seq 3) timeout
[59017.545893] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59020.874086] mt7921e 0000:02:00.0: Message 00000010 (seq 4) timeout
[59020.874099] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59024.202019] mt7921e 0000:02:00.0: Message 00000010 (seq 5) timeout
[59024.202033] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59027.530082] mt7921e 0000:02:00.0: Message 00000010 (seq 6) timeout
[59027.530096] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59030.857888] mt7921e 0000:02:00.0: Message 00000010 (seq 7) timeout
[59030.857904] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59034.185946] mt7921e 0000:02:00.0: Message 00000010 (seq 8) timeout
[59034.185961] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59037.514249] mt7921e 0000:02:00.0: Message 00000010 (seq 9) timeout
[59037.514262] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59040.842362] mt7921e 0000:02:00.0: Message 00000010 (seq 10) timeout
[59040.842375] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59040.923845] mt7921e 0000:02:00.0: hardware init failed

Fixes: 5c14a5f944b9 ("mt76: mt7921: introduce mt7921e support")
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Co-developed-by: Leon Yen <leon.yen@mediatek.com>
Signed-off-by: Leon Yen <leon.yen@mediatek.com>
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7921/dma.c | 4 ----
 drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 8 --------
 drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 8 ++++++++
 3 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
index f0a80c2b476a..4153cd6c2a01 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
@@ -231,10 +231,6 @@ int mt7921_dma_init(struct mt7921_dev *dev)
 	if (ret)
 		return ret;
 
-	ret = mt7921_wfsys_reset(dev);
-	if (ret)
-		return ret;
-
 	/* init tx queue */
 	ret = mt76_connac_init_tx_queues(dev->phy.mt76, MT7921_TXQ_BAND0,
 					 MT7921_TX_RING_SIZE,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index c69ce6df4956..f55caa00ac69 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -476,12 +476,6 @@ static int mt7921_load_firmware(struct mt7921_dev *dev)
 {
 	int ret;
 
-	ret = mt76_get_field(dev, MT_CONN_ON_MISC, MT_TOP_MISC2_FW_N9_RDY);
-	if (ret && mt76_is_mmio(&dev->mt76)) {
-		dev_dbg(dev->mt76.dev, "Firmware is already download\n");
-		goto fw_loaded;
-	}
-
 	ret = mt76_connac2_load_patch(&dev->mt76, mt7921_patch_name(dev));
 	if (ret)
 		return ret;
@@ -504,8 +498,6 @@ static int mt7921_load_firmware(struct mt7921_dev *dev)
 		return -EIO;
 	}
 
-fw_loaded:
-
 #ifdef CONFIG_PM
 	dev->mt76.hw->wiphy->wowlan = &mt76_connac_wowlan_support;
 #endif /* CONFIG_PM */
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index 1c727870bbdb..6c512bc75685 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -325,6 +325,10 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
 	bus_ops->rmw = mt7921_rmw;
 	dev->mt76.bus = bus_ops;
 
+	ret = mt7921e_mcu_fw_pmctrl(dev);
+	if (ret)
+		goto err_free_dev;
+
 	ret = __mt7921e_mcu_drv_pmctrl(dev);
 	if (ret)
 		goto err_free_dev;
@@ -333,6 +337,10 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
 		    (mt7921_l1_rr(dev, MT_HW_REV) & 0xff);
 	dev_info(mdev->dev, "ASIC revision: %04x\n", mdev->rev);
 
+	ret = mt7921_wfsys_reset(dev);
+	if (ret)
+		goto err_free_dev;
+
 	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);
 
 	mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);
-- 
2.18.0

Re: [PATCH] wifi: mt76: mt7921e: fix init command fail with enabled device

[Martinez, Juan]

Hi Deren,

I have tested this patch with mt7921e on AMD's PHX APU (on Mayan board) against an internal 6.1.x kernel and can confirm that it works as expected.

Tested-by: Juan Martinez <juan.martinez@amd.com>

Thanks,
Juan