drm_dp_dsc_b...x_line_width(9)

📦 version 7.3.1, in nixpkgs unstable

✨ drm_dp_dsc_branch_max_line_width ✨

okay so bestie, welcome to the Kernel API Manual page for drm_dp_dsc_branch_max_line_width(9) — yes the header up top is literally rendered as drm_dp_dsc_b...x_line_width(9) because terminals are dramatic and truncate things, but we know her full name and we're gonna say it with our whole chest 💅

🌸 NAME 🌸

drm_dp_dsc_branch_max_line_width — the branch device's max DSC line width, that's the whole vibe 🫶

🎀 SYNOPSIS 🎀

int drm_dp_dsc_branch_max_line_width (const u8
dsc_branch_dpcd[DP_DSC_BRANCH_CAP_SIZE] );

literally that's it. one function, one array, zero drama ✨

🦋 ARGUMENTS 🦋

  • dsc_branch_dpcd — the DSC branch capabilities straight out of DPCD, bestie 💖

🔥 DESCRIPTION 🔥

so what does she do? she returns the branch device's maximum overall DSC line width, and she figures it out based on the device's own dsc_branch_dpcd capabilities. it's giving "read the flex, report the flex" 😭👑

no cap, that's the entire description. she's a one-job icon and she ate.

👑 RETURN 👑

bestie the return values are a whole personality test, look:

  • 0 — the max line width is not indicated by the device separately, so it has to be determined from the maximum slice count and slice-width supported by the device. iykyk, you gotta derive it yourself 🧚
  • -EINVAL — the device is being messy and indicates an invalid maximum line width (< 5120 pixels). invalid. not the vibe. 🙈
  • >= 5120 — slay, that's the max line width in pixels ⭐🌈
lowkey important: 0 is not an error, it's a "go do the math with slice count and slice-width" situation. don't be out here treating it like a failure fr fr 💀

💜 SEE ALSO 💜

this list is long long, so buckle up bestie. all of these are from the kernel file ./drivers/gpu/drm/display/drm_dp_helper.c — the dp helpers zone — and here's the full squad in order:

like I said. the whole squad. she knows everyone 😭💖

and that's the page bestie!! 🎀 source is ./drivers/gpu/drm/display, version October 2026, Kernel API Manual — mwah, go read some DPCD, ily, bye 🦋💅✨

📦 where this page comes from