mipi_dbi_pow...tional_reset(9)

💅 mipi_dbi_pow...tional_reset(9) — Kernel API Manual

okay bestie, so this page is literally called mipi_dbi_pow...tional_reset(9) (yes the name is truncated with the dots, that's just how it is, she's iconic like that) and it lives in the Kernel API Manual. Let's get into it 💖

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✨ NAME ✨

mipi_dbi_poweron_conditional_reset — MIPI DBI poweron and conditional reset. That's the whole vibe: power it on, and reset it only if you have to. 🎀

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✨ SYNOPSIS ✨

int mipi_dbi_poweron_conditional_reset (struct mipi_dbi_dev *dbidev );

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✨ ARGUMENTS ✨

• dbidev — the MIPI DBI device structure 🦋 that's it, that's the whole argument list, she takes exactly one thing

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✨ DESCRIPTION ✨

Okay so here's what she actually does 👑

This function enables the regulator if one is used — and if the display is off, it does a hardware and a software reset. Both. Full send. 🔥

But here's the conditional part, and it's giving main character energy: if mipi_dbi_display_is_on determines that the display is already on, then no reset is performed. Periodt. She checks first, she doesn't just go around resetting things that are already thriving 💅

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✨ RETURN ✨

She comes back with one of three things ✨

• 0 — zero if the controller was reset 🎀
• 1 — if the display was already on (so she left it alone, respectful queen)
• a negative error code — if something went wrong 😭

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✨ SEE ALSO ✨

The whole friend group 🫶 go check them out:

• 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_spi_cmd_max_speed(9)
• mipi_dbi_spi_init(9)
• mipi_dbi_spi_transfer(9)
• mipi_dbi_debugfs_init(9)

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ngl the header on this one truncates the name to mipi_dbi_pow...tional_reset(9) — not a typo, that's just the flex 💀

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and that's the page!! 🧚 mwah 💜 this came from ./drivers/gpu/drm, dated October 2026 — catch you in the next one, bestie 💖🌸