drm_dp_dpcd_read_byte(9)

💅 drm_dp_dpcd_read_byte(9)

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for drm_dp_dpcd_read_byte, and honestly? it's giving "tiny function, big responsibility" 🎀

🌸 NAME 🌸

drm_dp_dpcd_read_byte — read a single byte from the DPCD 🦋

✨ SYNOPSIS ✨

int drm_dp_dpcd_read_byte (struct drm_dp_aux *aux , unsigned int offset
, u8 *valuep );

like, that's the whole signature, no cap 💖

🫶 ARGUMENTS 🫶

• aux — your DisplayPort AUX channel, the lil' messenger that carries the vibes 🌈
• offset — the address of the register you wanna read, iykyk 📍
• valuep — the location where the value of the register will be stored — this is where the answer goes to live 🏡

💀 DESCRIPTION 💀

Returns zero (0) on success, or a negative error code on failure. that's it. that's the whole description. short king behavior 👑 fr fr — success is 0, failure is negative, no in-between 🌸

🔥 SEE ALSO 🔥

okay this list is LONG and we're gonna get through it together, bestie, no skipping 🙈

Kernel file ./include/drm/display/drm_dp_helper.h, plus:

• 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_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)

and that's the page!! 🧚 sourced from ./include/drm/display, dated October 2026, and yes the header said drm_dp_dpcd_read_byte(9) the whole time, slay 💜 mwah, go read those bytes bestie 🍓