tegra_dfll_resume(9)

🌸 tegra_dfll_resume(9) 🌸

okay so real talk, bestie — this is a page straight out of the Kernel API Manual, and it's about tegra_dfll_resume. It's short, it's sweet, and it's literally the "wake up babe, we're back" function for the DFLL. Let's get into it 💅

---

✨ NAME ✨

tegra_dfll_resume — reinitialize DFLL on resume 🫶

It's giving "reset and come back stronger," no cap.

---

✨ SYNOPSIS ✨

int tegra_dfll_resume (struct device *dev );

Yep, that's the whole signature. One argument, one int return. Clean, iconic, minimal. 💖

---

✨ ARGUMENTS ✨

• dev — the DFLL instance 🌸 (like, which DFLL are we talking about? this one, bestie.)

---

✨ DESCRIPTION ✨

okay so here's the vibe: DFLL is disabled and reset during suspend and resume. So when it comes back, it's basically a blank slate — and that's where this function slides in. It reinitializes the DFLL IP block back for use, so the hardware is ready to actually do stuff again ✨

Now, important detail, don't skip this: the DFLL clock is enabled later in closed loop mode by the CPUFreq driver</just> before switching its clock source to DFLL output. So this function gets the IP block ready — it doesn't turn the clock on itself. The CPUFreq driver handles that part later. iykyk 🔥

---

✨ SEE ALSO ✨

Main character file: ./drivers/clk/tegra/clk-dfll.c 💀 (yes, that's a lot of cross-references, and yes, we're listing every single one, because we don't skip over things here 🎀)

• enum dfll_ctrl_mode(9)
• enum dfll_tune_range(9)
• struct dfll_rate_req(9)
• dfll_is_running(9)
• tegra_dfll_runtime_resume(9)
• tegra_dfll_runtime_suspend(9)
• dfll_tune_low(9)
• dfll_scale_dvco_rate(9)
• dfll_set_mode(9)
• dfll_i2c_set_output_enabled(9)
• dfll_pwm_set_output_enabled(9)
• dfll_set_force_output_value(9)
• dfll_set_force_output_enabled(9)
• dfll_force_output(9)
• dfll_load_i2c_lut(9)
• dfll_init_i2c_if(9)
• dfll_init_out_if(9)
• find_lut_index_for_rate(9)
• dfll_calculate_rate_request(9)
• dfll_set_frequency_request(9)
• dfll_request_rate(9)
• dfll_disable(9)
• dfll_enable(9)
• dfll_set_open_loop_config(9)
• dfll_lock(9)
• dfll_unlock(9)
• dfll_register_clk(9)
• dfll_unregister_clk(9)
• dfll_calc_monitored_rate(9)
• dfll_read_monitor_rate(9)
• dfll_set_default_params(9)
• dfll_init_clks(9)
• dfll_init(9)
• tegra_dfll_suspend(9)
• dfll_build_i2c_lut(9)
• read_dt_param(9)
• dfll_fetch_i2c_params(9)
• dfll_fetch_common_params(9)
• tegra_dfll_register(9)
• tegra_dfll_unregister(9)

---

bestie note: this one's the suspend/resume counterpart to tegra_dfll_suspend(9) and the runtime versions tegra_dfll_runtime_suspend(9) / tegra_dfll_runtime_resume(9) — so if you're poking at power management, that little cluster is your friend 🦋

---

and that's the whole page, bestie — short, sweet, and extremely specific 💜

source: ./drivers/clk/tegra · version/date: October 2026 — mwah, that's a wrap, go reinitialize something 🌈⭐