is_svp_dst_in_next_frame(9)

💖 is_svp_dst_in_next_frame(9) 💖

okay so bestie, welcome to the is_svp_dst_in_next_frame(9) page from the Kernel API Manual — yes that manual, we're in the kernel docs girlies now, pop off 🎀

This one is a helper function that figures out if a swath index (plus the dst line that's associated with it) belongs to the current frame or the next frame. and before you ask — the swath index can be a regular swath or an END swath, both are valid, we love inclusivity 💅

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✨ SYNOPSIS ✨

Like, literally the whole signature, character for character, no touchy:

bool is_svp_dst_in_next_frame (uint32_t swath_index , uint16_t
pre_swath_incl_boundary , uint32_t prefetch_swaths , uint32_t
pre_first_hdl_x1000 , uint32_t rec_first_hdl_x1000 , uint32_t
pre_hdl_delta_x1000 , uint32_t rec_hdl_delta_x1000 , uint32_t
curr_otg_line , uint32_t curr_frame_count , uint32_t dst_line , uint32_t
target_frame_count , uint16_t vstartup );

twelve parameters. TWELVE. she's high-maintenance and honestly? iconic 😭

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🌸 ARGUMENTS 🌸

so here's the thing, bestie — the original docs literally say -- undescribed -- for every single one of these. not me making it up, that's canon. so we're listing them all and being fully transparent about the mystery 🫶

• swath_index — -- undescribed -- (a mystery, a legend, a vibe)
• pre_swath_incl_boundary — -- undescribed --
• prefetch_swaths — -- undescribed --
• pre_first_hdl_x1000 — -- undescribed --
• rec_first_hdl_x1000 — -- undescribed --
• pre_hdl_delta_x1000 — -- undescribed --
• rec_hdl_delta_x1000 — -- undescribed --
• curr_otg_line — -- undescribed --
• curr_frame_count — -- undescribed --
• dst_line — -- undescribed --
• target_frame_count — -- undescribed --
• vstartup — -- undescribed --

ngl, all twelve showing up as -- undescribed -- is lowkey giving "the wiki page is a stub" energy 💀 but we keep every one, periodt.

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⭐ RETURN ⭐

Returns true if the swath and its associated dst line are considered part of the "next" frame, and false otherwise. that's it, that's the whole personality 💖

and then, right after that sentence, the original just drops this absolute unit of a line:

***********************************************************************************************************

not a single crumb of context. we respect the drama 👑

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🦋 SEE ALSO 🦋

The kernel file lives here, bestie, don't lose it:

./drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_standalone_libraries/alternate_pstate_shared_lib.c

and the whole friend group shows up too, so go say hi to:

• in_circular_range(9)
• apply_svp1_workaround(9)
• calculate_start_line_and_height_from_swath(9)
• get_swath_deadlines(9)
• calculate_swath_deadline_dst(9)
• is_dst_in_next_frame(9)
• is_end_swath_in_next_frame(9)
• calculate_swath_idx_from_dst(9)
• populate_svp_params(9)
• populate_start_index_num_swaths_helper(9)
• calculate_start_index_num_swaths(9)
• calculate_hubp_start_end_lines(9)
• get_prefetch_end_line(9)
• get_effective_vblank_start(9)

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real talk: every argument on this page is documented as -- undescribed --, so if you need the actual semantics, you're gonna have to go read the source, bestie. no cap, that's not a me problem, that's a docs problem 😭

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and that's the whole page, babes 🌈 this iconic little number ships from the source tree at ./drivers/gpu/drm/amd/display/... — October 2026 edition — mwah, take care, drink water, and remember: true if next frame, false otherwise 💜✨