STRUCT INTEL_DPLL(9)

💖 struct intel_dpll(9) 💖

okay bestie, welcome to the Kernel API Manual ✨ — this is the page for struct intel_dpll, which is literally the display PLL with tracked state and users. she's a whole main character in ./drivers/gpu/drm/i915/display, no cap 🫶

✨ SYNOPSIS ✨

struct intel_dpll {
    struct intel_dpll_state state;
    u8 index;
    u8 active_mask;
    bool on;
    const struct dpll_info *info;
    struct ref_tracker *wakeref;
 };

like, that's the whole struct. copy it exactly, don't @ me 💅

🎀 Members 🎀

• state — this one stores the state for the pll, and yes that includes its hw state and the CRTCs using it. it's giving "holds everything together" energy 👑
• index — the index for atomic state. small but iconic 🌸
• active_mask — mask of active pipes (i.e. DPMS on) that are using this DPLL. it's literally a vibe check for which pipes are awake ⭐
• on — is the PLL actually active? bestie this gets disabled during modeset, so don't assume 🙈
• info — platform specific info. different platforms, different lore, iykyk 🔥
• wakeref — on some platforms a device-level runtime pm reference may need to be grabbed to disable DC states while this DPLL is enabled. so yeah, hold that reference, bestie 🫶

real talk: on being false during modeset is not a bug, it's just how she moves. read it before you trust it 💀

🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/i915/display/intel_dpll_mgr.h
• enum intel_dpll_id(9)
• struct intel_dpll_state(9)
• struct dpll_info(9)

like go read those next, they're all connected fr fr 🦋

and that's the page!! 💖 this lore drop lives in ./drivers/gpu/drm/i915/display, dated October 2026, and it's called struct intel_dpll(9) — periodt, stan her, and read the source before you ship anything 🌸✨