If you have ever dug through a dmesg log, tried to port a custom ROM, or debugged mobile network drops on a Samsung Galaxy device, you have likely encountered this enigmatic label. But what exactly is this driver? Why does "MSS Ver.3" matter? And how does it affect your device’s performance, stability, and connectivity?
Unlike older modem drivers that kept the USB port active at full power, MSS Ver.3 includes improved power management logic. It allows the Windows OS to selectively suspend the USB port when data is not actively being transferred, preserving the battery life of the laptop and, to a lesser extent, the connected phone. samsung android modem device driver -mss ver.3-
static irqreturn_t mss_v3_wakeup_irq(int irq, void *dev_id) struct mss_v3_device *mss = dev_id; pm_wakeup_event(mss->dev, 0); schedule_work(&mss->resume_work); return IRQ_HANDLED; If you have ever dug through a dmesg
Typical device tree node for MSS v3 on an Exynos 2200 device: And how does it affect your device’s performance,
[Android RIL] → [samsung-ril] → [IPC Router] → [MSS VER.3 Driver] → [Modem Hardware]