drm_dsc_dp_rc_buffer_size(9)

💅 drm_dsc_dp_rc_buffer_size(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you're deep in the DRM DSC helpers, you've got a DisplayPort config staring at you, and you just need to know how many bytes your rc buffer is. That's the whole gig. Getting the rc buffer size, in bytes. That's it. That's the function. ✨

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✨ SYNOPSIS ✨

int drm_dsc_dp_rc_buffer_size (u8 rc_buffer_block_size , u8 rc_buffer_size );

Two u8s in, one int out. Simple. Clean. Iconic. 🫶

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🌸 ARGUMENTS 🌸

• rc_buffer_block_size — the block size code, straight from DPCD offset 62h 📍 like that's literally where it lives, no cap
• rc_buffer_size — the number of blocks minus 1, per DPCD offset 63h 🧮 (yes, minus one, they're built different like that)

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💖 RETURN 💖

It gives you the buffer size in bytes 🎉 — or 0 on invalid input, because sometimes the vibe check does not pass and you get nothing back 😭💀

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👑 SEE ALSO 👑

• Kernel file ./drivers/gpu/drm/display/drm_dsc_helper.c — the whole dsc helpers crew, dsc helpers(9) 🦋
• drm_dsc_dp_pps_header_init(9) ⭐
• drm_dsc_pps_payload_pack(9) 🌈
• drm_dsc_set_const_params(9) 🍓
• drm_dsc_set_rc_buf_thresh(9) 💜
• drm_dsc_setup_rc_params(9) 🧚
• drm_dsc_compute_rc_parameters(9) 🔥
• drm_dsc_get_bpp_int(9) 🌸
• drm_dsc_initial_scale_value(9) ✨
• drm_dsc_flatness_det_thresh(9) 🎀
• drm_dsc_dump_config(9) 👑

fr fr the whole friend group is listed, go read them all 💅

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ngl this one's short and sweet — but remember it returns 0 when the input doesn't make sense, so don't go treating that zero like a real buffer size 🙈

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alright bestie that's the whole page 💖 it lives over in ./drivers/gpu/drm/display, and this little gem is dated October 2026 ⭐ mwah, go slay your DSC config 🧚‍♀️💅