dce8_program_watermarks(9)

✨ dce8_program_watermarks — program display watermarks ✨

okay bestie, this one's a kernel API page (man section 9, the fancy kernel/dev one 💅), and it's literally about telling the display hardware where to draw its watermark lines. let's get into it 🫶

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🌸 SYNOPSIS 🌸

void dce8_program_watermarks (struct radeon_device *rdev , struct
       radeon_crtc *radeon_crtc , u32 lb_size , u32 num_heads );

no return value, she just does the thing and leaves ✨

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🎀 ARGUMENTS 🎀

• rdev — a radeon_device pointer, aka your whole GPU situation 🖥️
• radeon_crtc — the selected display controller, the one getting the glow-up
• lb_size — line buffer size, the number she's working with
• num_heads — how many display controllers are in use rn 👀

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💖 DESCRIPTION 💖

She calculates and programs the display watermarks for the selected display controller (CIK). that's the whole vibe. math first, then she writes it to the hardware. icon behavior, no cap 💅

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🦋 SEE ALSO 🦋

Kernel file ./drivers/gpu/drm/radeon/cik.c, plus the whole friend group:

cik_get_allowed_info_register(9), cik_get_xclk(9), cik_mm_rdoorbell(9), cik_mm_wdoorbell(9), cik_srbm_select(9), ci_mc_load_microcode(9), cik_init_microcode(9), cik_tiling_mode_table_init(9), cik_select_se_sh(9), cik_create_bitmask(9), cik_get_rb_disabled(9), cik_setup_rb(9), cik_gpu_init(9), cik_scratch_init(9), cik_ring_test(9), cik_hdp_flush_cp_ring_emit(9), cik_fence_gfx_ring_emit(9), cik_fence_compute_ring_emit(9), cik_semaphore_ring_emit(9), cik_copy_cpdma(9), cik_ring_ib_execute(9), cik_ib_test(9), cik_cp_gfx_enable(9), cik_cp_gfx_load_microcode(9), cik_cp_gfx_start(9), cik_cp_gfx_fini(9), cik_cp_gfx_resume(9), cik_cp_compute_enable(9), cik_cp_compute_load_microcode(9), cik_cp_compute_start(9), cik_cp_compute_fini(9), cik_cp_compute_resume(9), cik_gpu_check_soft_reset(9), cik_gpu_soft_reset(9), cik_asic_reset(9), cik_gfx_is_lockup(9), cik_mc_program(9), cik_mc_init(9), cik_pcie_gart_tlb_flush(9), cik_pcie_gart_enable(9), cik_pcie_gart_disable(9), cik_pcie_gart_fini(9), cik_ib_parse(9), cik_vm_init(9), cik_vm_fini(9), cik_vm_decode_fault(9), cik_rlc_stop(9), cik_rlc_start(9), cik_rlc_resume(9), cik_enable_interrupts(9), cik_disable_interrupts(9), cik_disable_interrupt_state(9), cik_irq_init(9), cik_irq_set(9), cik_irq_ack(9), cik_irq_disable(9), cik_irq_suspend(9), cik_irq_fini(9), cik_get_ih_wptr(9), cik_irq_process(9), cik_startup(9), cik_resume(9), cik_suspend(9), cik_init(9), cik_fini(9), dce8_line_buffer_adjust(9), cik_get_number_of_dram_channels(9), dce8_dram_bandwidth(9), dce8_dram_bandwidth_for_display(9), dce8_data_return_bandwidth(9), dce8_dmif_request_bandwidth(9), dce8_available_bandwidth(9), dce8_average_bandwidth(9), dce8_latency_watermark(9), dce8_average_bandwidth_vs_dram_bandwidth_for_display(9), dce8_average_bandwidth_vs_available_bandwidth(9), dce8_check_latency_hiding(9), dce8_bandwidth_update(9), cik_get_gpu_clock_counter(9)

lowkey a whole squad, iykyk 🌈 (and yes, cik_bandwidth_update's cousin dce8_bandwidth_update is in there — they're besties)

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this page lives in ./drivers/gpu/drm/radeon, and it's stamped October 2026 🎀 that's the version + date, bestie — and that's a wrap! 💜