STRUCT DRM_DP_AS_SDP(9)

💅 struct drm_dp_as_sdp(9) — like, the whole glow-up ✨

okay so bestie, welcome to the struct drm_dp_as_sdp page from your fave Kernel API Manual — this is the drm DP Adaptive Sync SDP struct and honestly she's carrying the whole display stack on her back 🫶

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🌸 NAME 🌸

struct drm_dp_as_sdp — drm DP Adaptive Sync SDP. that's it, that's the name, no notes 💅

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🎀 SYNOPSIS 🎀

like, here's literally what she looks like, copy-paste exact, do NOT touch:

struct drm_dp_as_sdp {
    unsigned char sdp_type;
    unsigned char revision;
    unsigned char length;
    int vtotal;
    int target_rr;
    int duration_incr_ms;
    int duration_decr_ms;
    bool target_rr_divider;
    enum operation_mode mode;
    int coasting_vtotal;
};

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👑 Members 👑

okay so let's meet the cast, each one's a main character in her own right:

• sdp_type — Secondary-data packet type. iykyk 🦋
• revision — Revision Number. she's giving version history, periodt ✨
• length — Number of valid data bytes. not too long, not too short, just right 💖
• vtotal — Minimum Vertical Vtotal. the literal floor, no cap 📉
• target_rr — Target Refresh. the vibe she's aiming for 🔥
• duration_incr_ms — Successive frame duration increase. she's growing, she's thriving 🌱
• duration_decr_ms — Successive frame duration decrease. and sometimes she shrinks, it's fine 🍓
• target_rr_divider — Target refresh rate divider. splitting the refresh rate like a shared meal, generous <3 🌈
• mode — Adaptive Sync Operation Mode. which era of her personality are we in today 🧚
• coasting_vtotal — Coasting vtotal. just vibing, no pedals, literally coasting 💀

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⭐ Description ⭐

okay so real talk: this structure represents a DP AS SDP of drm 😭 and she is based on the DP 2.1 spec, specifically [Table 2-126: Adaptive-Sync SDP Header Bytes] and [Table 2-127: Adaptive-Sync SDP Payload for DB0 through DB8]. the double space in "Table 2-126: Adaptive-Sync" is canon, bestie, I don't make the rules 🙈

like, that's genuinely it — she's a struct, she holds fields, she cites two tables, she slays 💅✨

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🦋 SEE ALSO 🦋

go read these next, bestie, I'm obsessed with all of them:

Kernel file ./include/drm/display/drm_dp_helper.h struct drm_dp_vsc_sdp(9), drm_dp_dsc_sink_supports_format(9), drm_edp_backlight_supported(9), drm_dp_is_uhbr_rate(9), struct drm_dp_aux_msg(9), struct drm_dp_aux_cec(9), struct drm_dp_aux(9), drm_dp_dpcd_readb(9), drm_dp_dpcd_read_data(9), drm_dp_dpcd_write_data(9), drm_dp_dpcd_writeb(9), drm_dp_dpcd_read_byte(9), drm_dp_dpcd_write_byte(9), struct drm_dp_desc(9), enum drm_dp_quirk(9), drm_dp_has_quirk(9), struct drm_edp_backlight_info(9), struct drm_dp_phy_test_params(9)

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ngl that SEE ALSO list is a whole friend group and they're all invited to the group chat 🫶

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and that's the page!! 💖 shoutout to the source path ./include/drm/display, dated October 2026 — she's from the future, she's iconic, mwah 😘 bye bestie, go sync those adaptive packets 🎀🌸✨