STRUCT EMIF_CUSTOM_CONFIGS(9)

💖 struct emif_custom_configs (9) — Kernel API Manual 💖

okay bestie, gather round, because this is the little struct that lets the platform layer hand down its own custom configuration parameters and policies to the EMIF driver 🎀 like, it's the messenger, it's the vibe-bringer, it's giving "I come bearing settings." ✨

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🌸 NAME 🌸

struct emif_custom_configs — custom configuration parameters/policies passed from the platform layer 🫶

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✨ SYNOPSIS ✨

struct emif_custom_configs {
    u32 mask;
    u32 lpmode;
    u32 lpmode_timeout_performance;
    u32 lpmode_timeout_power;
    u32 lpmode_freq_threshold;
    u32 temp_alert_poll_interval_ms;
 };

no cap, that's the whole shape of it 💅 keep scrolling for the member-by-member breakdown, iykyk 👑

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🦋 Members 🦋

💜 the fields, one by one 💜

• mask — the mask that tells everyone which configs are actually being requested 👀 like a little guest list for your settings.
• lpmode — the LPMODE to be used in the PWR_MGMT_CTRL register 🔥 that's the one, that's the register.
• lpmode_timeout_performance — the timeout before LPMODE entry when you want higher performance and you're willing to pay for it in power 😭 (typically at higher OPPs).
• lpmode_timeout_power — the timeout before LPMODE entry when better power savings is the moment and performance is simply not the priority 🍓 (typically at lower loads, which show up as lower OPPs).
• lpmode_freq_threshold — the DDR frequency threshold that sorts the two cases above apart. fr fr, here's the whole decision in one line:

timeout = (freq >= lpmode_freq_threshold) ? lpmode_timeout_performance : lpmode_timeout_power;

literally that's it, that's the whole vibe check 🧚

• temp_alert_poll_interval_ms — the LPDDR2 MR4 polling interval at nominal temperature, in milliseconds ⏱️ and when the temperature gets high? polling happens 4 times as frequently 🔥 not me stressing about thermals 💀

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/platform_data/emif_plat.h, struct ddr_device_info(9), struct emif_platform_data(9) 💖 go read those next, bestie, they're iconic 👑

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💅 reminder: the mask is what decides which of these configs are actually requested — don't set fields and forget to ask for them, that's giving chaos.

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alright that's the whole page 🫶 this came from ./include/linux/platform_data, dated October 2026, and honestly? slay ⭐ bye bestie 💜