STRUCT DRM_DP_PHY_TEST_PARAMS(9)

💅 struct drm_dp_phy_test_params(9) — like, the Kernel API Manual edition 🎀

okay bestie, buckle up, because this one lives in the Kernel API Manual and it's basically the little glow-up form your DisplayPort PHY fills out for compliance testing ✨ it's giving "backstage pass to the DPCD registers" and honestly? obsessed.

---

🌸 NAME 🌸

struct drm_dp_phy_test_params — the DP Phy Compliance parameters, periodt. 💖

---

✨ SYNOPSIS ✨

struct drm_dp_phy_test_params {
    int link_rate;
    u8 num_lanes;
    u8 phy_pattern;
    u8 hbr2_reset[2];
    u8 custom80[10];
    bool enhanced_frame_cap;
 };

like, that's the whole vibe right there 🫶 every single field, no cap.

---

🦋 Members 🦋

• link_rate — the Requested Link rate that came in from DPCD 0x219 💫 literally the speed they're asking for.
• num_lanes — the Number of lanes requested by sing through DPCD 0x220 🛣️ (yes that's the exact wording, don't come for me, I just report the facts).
• phy_pattern — the DP Phy test pattern straight outta DPCD 0x248 🎨 the main character of this whole struct, ngl.
• hbr2_reset — DP HBR2_COMPLIANCE_SCRAMBLER_RESET from DCPD 0x24A and 0x24B 🔁 a two-byte reset moment, iconic.
• custom80 — DP Test_80BIT_CUSTOM_PATTERN from DPCDs 0x250 through 0x259 🌈 ten whole bytes of custom pattern, we love a DIY moment.
• enhanced_frame_cap — flag for enhanced frame capability 👑 a bool, so it's just yes/no energy.

---

💜 SEE ALSO 💜

go read the Kernel file ./include/drm/display/drm_dp_helper.h fr fr, plus these absolute legends:

• struct drm_dp_vsc_sdp(9)
• struct drm_dp_as_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)

---

🫶 quick vibe check: this page is sourced from ./include/drm/display and it's dated October 2026 — so yeah, future-flavored documentation, slay 💅

k bye, go test those PHYs, you're gonna ate 💖✨🎀