[PATCH 5.9 323/757] mt76: mt7622: fix fw hang on mt7622

Greg Kroah-Hartman
2020-10-27T15:41:43Z

From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit 6892555dbe71ed551d3779aa20747484dc9b6ad5 ]

Set poll timeout to 3s for mt7622 devices in order to avoid fw hangs.
Swap mt7622_trigger_hif_int and doorbell configuration order in
mt7615_mcu_drv_pmctrl routine.
Introduce mt7615_mcu_lp_drv_pmctrl routine to take care of drv_own
configuration for runtime-pm.

Fixes: 08523a2a1db5 ("mt76: mt7615: add mt7615_pm_wake utility routine")
Fixes: 894b7767ec2f ("mt76: mt7615: improve mt7615_driver_own reliability")
Fixes: 757b0e7fd6f4 ("mt76: mt7615: avoid polling in fw_own for mt7663")
Co-developed-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/wireless/mediatek/mt76/mt7615/mcu.c | 46 +++++++++++++------
1 file changed, 32 insertions(+), 14 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index 82b6edd7a9f67..f42a69ee5635a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -338,28 +338,46 @@ static int mt7615_mcu_drv_pmctrl(struct mt7615_dev *dev)
{
struct mt76_phy *mphy = &dev->mt76.phy;
struct mt76_dev *mdev = &dev->mt76;
- int i;
+ u32 addr;
+ int err;

- if (!test_and_clear_bit(MT76_STATE_PM, &mphy->state))
- goto out;
+ addr = is_mt7663(mdev) ? MT_PCIE_DOORBELL_PUSH : MT_CFG_LPCR_HOST;
+ mt76_wr(dev, addr, MT_CFG_LPCR_HOST_DRV_OWN);

mt7622_trigger_hif_int(dev, true);

- for (i = 0; i < MT7615_DRV_OWN_RETRY_COUNT; i++) {
- u32 addr;
+ addr = is_mt7663(mdev) ? MT_CONN_HIF_ON_LPCTL : MT_CFG_LPCR_HOST;
+ err = !mt76_poll_msec(dev, addr, MT_CFG_LPCR_HOST_FW_OWN, 0, 3000);

- addr = is_mt7663(mdev) ? MT_PCIE_DOORBELL_PUSH : MT_CFG_LPCR_HOST;
- mt76_wr(dev, addr, MT_CFG_LPCR_HOST_DRV_OWN);
+ mt7622_trigger_hif_int(dev, false);

- addr = is_mt7663(mdev) ? MT_CONN_HIF_ON_LPCTL : MT_CFG_LPCR_HOST;
- if (mt76_poll_msec(dev, addr, MT_CFG_LPCR_HOST_FW_OWN, 0, 50))
- break;
+ if (err) {
+ dev_err(mdev->dev, "driver own failed\n");
+ return -ETIMEDOUT;
}

- mt7622_trigger_hif_int(dev, false);
+ clear_bit(MT76_STATE_PM, &mphy->state);
+
+ return 0;
+}
+
+static int mt7615_mcu_lp_drv_pmctrl(struct mt7615_dev *dev)
+{
+ struct mt76_phy *mphy = &dev->mt76.phy;
+ int i;
+
+ if (!test_and_clear_bit(MT76_STATE_PM, &mphy->state))
+ goto out;
+
+ for (i = 0; i < MT7615_DRV_OWN_RETRY_COUNT; i++) {
+ mt76_wr(dev, MT_PCIE_DOORBELL_PUSH, MT_CFG_LPCR_HOST_DRV_OWN);
+ if (mt76_poll_msec(dev, MT_CONN_HIF_ON_LPCTL,
+ MT_CFG_LPCR_HOST_FW_OWN, 0, 50))
+ break;
+ }

if (i == MT7615_DRV_OWN_RETRY_COUNT) {
- dev_err(mdev->dev, "driver own failed\n");
+ dev_err(dev->mt76.dev, "driver own failed\n");
set_bit(MT76_STATE_PM, &mphy->state);
return -EIO;
}
@@ -386,7 +404,7 @@ static int mt7615_mcu_fw_pmctrl(struct mt7615_dev *dev)

if (is_mt7622(&dev->mt76) &&
!mt76_poll_msec(dev, addr, MT_CFG_LPCR_HOST_FW_OWN,
- MT_CFG_LPCR_HOST_FW_OWN, 300)) {
+ MT_CFG_LPCR_HOST_FW_OWN, 3000)) {
dev_err(dev->mt76.dev, "Timeout for firmware own\n");
clear_bit(MT76_STATE_PM, &mphy->state);
err = -EIO;
@@ -1900,7 +1918,7 @@ static const struct mt7615_mcu_ops uni_update_ops = {
.add_tx_ba = mt7615_mcu_uni_tx_ba,
.add_rx_ba = mt7615_mcu_uni_rx_ba,
.sta_add = mt7615_mcu_uni_add_sta,
- .set_drv_ctrl = mt7615_mcu_drv_pmctrl,
+ .set_drv_ctrl = mt7615_mcu_lp_drv_pmctrl,
.set_fw_ctrl = mt7615_mcu_fw_pmctrl,
};

--
2.25.1