mt76: mt7615: improve mt7615_driver_own reliability

mt7615_driver_own can fail if it runs too close to mt7615_fw_own. In
order to improve mt7615_driver_own reliability, retry to get runtime-pm
ownership if mt7615_driver_own fails

Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index 2d10154..2e9e000 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -1891,29 +1891,36 @@ int mt7615_driver_own(struct mt7615_dev *dev)
 {
        struct mt76_phy *mphy = &dev->mt76.phy;
        struct mt76_dev *mdev = &dev->mt76;
-       int err = 0;
-       u32 addr;
+       int i;
 
        if (!test_and_clear_bit(MT76_STATE_PM, &mphy->state))
                goto out;
 
        mt7622_trigger_hif_int(dev, true);
 
-       addr = is_mt7663(mdev) ? MT_PCIE_DOORBELL_PUSH : MT_CFG_LPCR_HOST;
-       mt76_wr(dev, addr, MT_CFG_LPCR_HOST_DRV_OWN);
+       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;
-       if (!mt76_poll_msec(dev, addr, MT_CFG_LPCR_HOST_FW_OWN, 0, 3000)) {
-               dev_err(mdev->dev, "Timeout for driver own\n");
-               set_bit(MT76_STATE_PM, &mphy->state);
-               err = -EIO;
+               addr = is_mt7663(mdev) ? MT_PCIE_DOORBELL_PUSH : MT_CFG_LPCR_HOST;
+               mt76_wr(dev, addr, MT_CFG_LPCR_HOST_DRV_OWN);
+
+               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;
        }
 
        mt7622_trigger_hif_int(dev, false);
+
+       if (i == MT7615_DRV_OWN_RETRY_COUNT) {
+               dev_err(mdev->dev, "driver own failed\n");
+               set_bit(MT76_STATE_PM, &mphy->state);
+               return -EIO;
+       }
+
 out:
        dev->pm.last_activity = jiffies;
 
-       return err;
+       return 0;
 }
 EXPORT_SYMBOL_GPL(mt7615_driver_own);
 

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
index 9f25827..688bd7b 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
@@ -33,6 +33,8 @@
 #define MT7615_RX_RING_SIZE            1024
 #define MT7615_RX_MCU_RING_SIZE                512
 
+#define MT7615_DRV_OWN_RETRY_COUNT     10
+
 #define MT7615_FIRMWARE_CR4            "mediatek/mt7615_cr4.bin"
 #define MT7615_FIRMWARE_N9             "mediatek/mt7615_n9.bin"
 #define MT7615_ROM_PATCH               "mediatek/mt7615_rom_patch.bin"