net: wwan: t7xx: Fix Runtime PM initialization

[ Upstream commit e3d6d152a1cbdee25f2e3962009a2751b54e2297 ]

For PCI devices the Runtime PM refcount is incremented twice:
1. During device enumeration with a call to pm_runtime_forbid.
2. Just before a driver probe logic is called.
Because of that in order to enable Runtime PM on a given device
we have to call both pm_runtime_allow and pm_runtime_put_noidle,
once it's ready to be runtime suspended.
The former was missing causing the pm refcount to never reach 0.

Fixes: d10b3a695ba0 ("net: wwan: t7xx: Runtime PM")
Signed-off-by: Kornel Dulęba <mindal@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wwan/t7xx/t7xx_pci.c b/drivers/net/wwan/t7xx/t7xx_pci.c
index 871f2a2..226fc17 100644 (file)
--- a/drivers/net/wwan/t7xx/t7xx_pci.c
+++ b/drivers/net/wwan/t7xx/t7xx_pci.c
@@ -121,6 +121,8 @@ void t7xx_pci_pm_init_late(struct t7xx_pci_dev *t7xx_dev)
        iowrite32(T7XX_L1_BIT(0), IREG_BASE(t7xx_dev) + ENABLE_ASPM_LOWPWR);
        atomic_set(&t7xx_dev->md_pm_state, MTK_PM_RESUMED);
 
+       pm_runtime_mark_last_busy(&t7xx_dev->pdev->dev);
+       pm_runtime_allow(&t7xx_dev->pdev->dev);
        pm_runtime_put_noidle(&t7xx_dev->pdev->dev);
 }