dpu_encoder...run_callback(9)

💅 dpu_encoder_underrun_callback — Kernel API Manual, section (9) 🎀

okay so bestie, welcome to the Kernel API Manual, section 9. this one's a kernel-internals page, so grab your emotional support iced coffee and let's get into it ✨

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✨ NAME ✨

dpu_encoder_underrun_callback — literally just here to notify the virtual encoder that an underrun IRQ showed up. that's it, that's the whole job. no cap. 🦋

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🌸 SYNOPSIS 🌸

void dpu_encoder_underrun_callback (struct drm_encoder *drm_enc , struct
       dpu_encoder_phys *phy_enc );

returns void, so no "did it work" moment — it just does the thing 💅

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🫶 ARGUMENTS 🫶

• drm_enc — pointer to the drm encoder structure. your DRM-side bestie 🎀
• phy_enc — pointer to the physical encoder. the physical one, iykyk 🔥

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👑 NOTE 👑

⚠️ this bad boy gets called from IRQ handler context. like, actual interrupt context. so act accordingly — no sleeping, no blocking, no main character energy in here, fr fr 😭

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🌈 SEE ALSO 🌈

okay this list is giving "the whole friend group showed up" — every single one, no skips 💖

the kernel file lives at ./drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c, and then:

• enum dpu_enc_rc_events(9)
• struct dpu_encoder_virt(9)
• dpu_encoder_get_drm_fmt(9)
• dpu_encoder_needs_periph_flush(9)
• dpu_encoder_is_widebus_enabled(9)
• dpu_encoder_is_dsc_enabled(9)
• dpu_encoder_get_crc_values_cnt(9)
• dpu_encoder_setup_misr(9)
• dpu_encoder_get_crc(9)
• dpu_encoder_helper_report_irq_timeout(9)
• dpu_encoder_helper_wait_for_irq(9)
• dpu_encoder_get_vsync_count(9)
• dpu_encoder_get_linecount(9)
• dpu_encoder_helper_split_config(9)
• dpu_encoder_use_dsc_merge(9)
• dpu_encoder_get_dsc_config(9)
• dpu_encoder_prepare_wb_job(9)
• dpu_encoder_cleanup_wb_job(9)
• dpu_encoder_virt_runtime_resume(9)
• dpu_encoder_vblank_callback(9)
• dpu_encoder_assign_crtc(9)
• dpu_encoder_toggle_vblank_for_crtc(9)
• dpu_encoder_frame_done_callback(9)
• _dpu_encoder_trigger_flush(9)
• _dpu_encoder_trigger_start(9)
• dpu_encoder_helper_trigger_start(9)
• _dpu_encoder_kickoff_phys(9)
• dpu_encoder_trigger_kickoff_pending(9)
• dpu_encoder_vsync_time(9)
• dpu_encoder_prepare_for_kickoff(9)
• dpu_encoder_is_valid_for_commit(9)
• dpu_encoder_start_frame_done_timer(9)
• dpu_encoder_kickoff(9)
• dpu_encoder_helper_phys_cleanup(9)
• dpu_encoder_helper_phys_setup_cdm(9)
• dpu_encoder_get_clones(9)
• dpu_encoder_init(9)
• dpu_encoder_wait_for_commit_done(9)
• dpu_encoder_wait_for_tx_complete(9)
• dpu_encoder_get_intf_mode(9)
• dpu_encoder_helper_get_cwb_mask(9)
• dpu_encoder_helper_get_dsc(9)

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and that's the whole page, bestie 🍓 no crumbs left. this masterpiece came from ./drivers/gpu/drm/msm/disp/dpu1, dated October 2026 — go drink some water and go touch grass (after you finish reading the kernel source) 🧚💜