mipi_dbi_spi_cmd_max_speed(9)

✨ mipi_dbi_spi_cmd_max_speed ✨

okay bestie, welcome to the Kernel API Manual 💖 this is the page for mipi_dbi_spi_cmd_max_speed(9) — the little function that tells you how fast your SPI bus is allowed to go. it's giving "traffic cop but make it cute" 👑

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🌸 NAME 🌸

mipi_dbi_spi_cmd_max_speed — get the maximum SPI bus speed 🏎️✨

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🎀 SYNOPSIS 🎀

u32 mipi_dbi_spi_cmd_max_speed (struct spi_device *spi , size_t len );

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🦋 ARGUMENTS 🦋

• spi — the SPI device, obviously 💅 this is the thing we're asking about
• len — the transfer buffer length. yeah, the length of the buffer, we need it, don't skip it 🫶

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💜 DESCRIPTION 💜

okay so here's the tea ☕ lots of controllers out there have a max speed of 10MHz — that's their comfort zone, their safe little bubble 🫧 but ngl they can be pushed way beyond that 🔥 like, so far beyond.

so the move is: run the pixel data at max speed (let it cook 🍳) and run the rest at 10MHz. why?? because that increases reliability — it prevents transfer glitches from messing up the init settings 😭💀 like imagine your whole display init getting corrupted because the bus was going too feral. not on our watch.

the way this works is literally just vibe check by length: big len = pixel data = floor it, small len = everything else = chill at 10MHz. iconic behaviour honestly 💅

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/drm_mipi_dbi.c overview(9)
• mipi_dbi_command_read(9)
• mipi_dbi_command_buf(9)
• mipi_dbi_buf_copy(9)
• drm_mipi_dbi_crtc_helper_mode_valid(9)
• drm_mipi_dbi_plane_helper_atomic_check(9)
• drm_mipi_dbi_plane_helper_atomic_update(9)
• drm_mipi_dbi_crtc_helper_atomic_check(9)
• drm_mipi_dbi_crtc_helper_atomic_disable(9)
• drm_mipi_dbi_connector_helper_get_modes(9)
• drm_mipi_dbi_dev_init(9)
• mipi_dbi_hw_reset(9)
• mipi_dbi_display_is_on(9)
• mipi_dbi_poweron_reset(9)
• mipi_dbi_poweron_conditional_reset(9)
• mipi_dbi_spi_init(9)
• mipi_dbi_spi_transfer(9)
• mipi_dbi_debugfs_init(9)

like, that's the whole friend group right there 🫶 go read them, they're all slay.

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and that's the page!! 🎀 brought to you by ./drivers/gpu/drm, the Kernel API Manual, dated October 2026 — mwah, ily, go read your kernel source bestie 💋🌟 mipi_dbi_spi_cmd_max_speed(9) out 🦋