msm_dp_link_...ining_params(9)

💅 msm_dp_link_...ining_params(9) — bestie's guide to the Kernel API Manual 🎀

okay so this is a page straight out of the Kernel API Manual, and it's giving "small function, big responsibilities" energy. it's literally about one little function that reads DisplayPort link training stuff out of DPCD and we're gonna walk through it together, no cap ✨

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🌸 NAME 🌸

msm_dp_link_parse_link_training_params — it parses link training parameters from DPCD. that's it, that's the whole job, and honestly? iconic. 💅

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🦋 SYNOPSIS 🦋

int msm_dp_link_parse_link_training_params (struct msm_dp_link_private
*link );

like yes bestie it takes one argument and returns an int, we love a clean signature, we love no surprises 🫶

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💖 ARGUMENTS 💖

• link — the Display Port Driver data. that's the vibe, that's the whole parameter list. one (1) pointer, main character energy 👑

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🔥 DESCRIPTION 🔥

so here's the tea ☕: this function returns 0 if it successfully parses the link rate (Byte 0x219) and the lane count (Byte 0x220) — and also if those values it parsed come out valid. two bytes, one vibe check, and boom, you get a 0. ✨

like, the way that it's literally just "read 0x219, read 0x220, confirm they're not weird" — obsessed. ngl it's a little guy doing important work and we respect it fr fr 🧚

heads up: the successful return is specifically 0, and it hinges on both the parse working out and the parsed values being valid. no shortcuts, no "close enough" 🎀

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🌈 SEE ALSO 🌈

bestie you KNOW we gotta shout out the whole friend group 💜 these are the related pages and the kernel file where the magic lives:

• the kernel file, ./drivers/gpu/drm/msm/dp/dp_link.c — that's where this function is at home 🏠
• msm_dp_link_is_bit_depth_valid(9)
• msm_dp_link_parse_video_pattern_params(9)
• msm_dp_link_parse_phy_test_params(9)
• msm_dp_link_is_video_audio_test_requested(9)
• msm_dp_link_parse_request(9)
• msm_dp_link_process_link_training_request(9)
• msm_dp_link_process_phy_test_pattern_request(9)
• msm_dp_link_process_link_status_update(9)
• msm_dp_link_process_ds_port_status_change(9)
• msm_dp_link_process_request(9)

the whole dp_link.c squad, assembled, ate and left no crumbs 🔥

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and that's the page!! 🍓 quick cute sign-off to match the footer: this one lives over in ./drivers/gpu/drm/msm/dp, it's dated October 2026, and you can find it filed under msm_dp_link_...ining_params(9) 🦋 go read the source bestie, and stay slay 💖✨