i810_calc_dclk(9)

💖 NAME 💖

i810_calc_dclk — this is the Kernel API Manual page for the function that calculates the P, M, and N values of a pixelclock value. Bestie, that’s the whole name vibe, and yes, it’s giving very specific kernel energy. 🎀

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✨ SYNOPSIS ✨

okay so here’s the exact signature, no cap:

void i810_calc_dclk (u32 freq , u32 *m , u32 *n , u32 *p );

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🎀 ARGUMENTS 🎀

• freq — the target pixelclock, in picoseconds. ⏱️
• m — where to write M register. 💅
• n — where to write N register. ✨
• p — where to write P register. 🦋

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🦋 DESCRIPTION 🦋

okay so based on the formula:

Freq_actual = (4*M*Freq_ref)/(N^P)

It repeatedly computes the Freq until the actual Freq is equal to the target Freq, or until the loop count is zero. In the latter case, the actual frequency nearest the target will be used — periodt. 💀✨

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/video/fbdev/i810/i810_main.c

and here’s the whole see-also squad in order, because we do not skip anyone:

• i810_screen_off(9)
• i810_dram_off(9)
• i810_protect_regs(9)
• i810_load_pll(9)
• i810_load_vga(9)
• i810_load_vgax(9)
• i810_load_2d(9)
• i810_hires(9)
• i810_load_pitch(9)
• i810_load_color(9)
• i810_load_regs(9)
• get_line_length(9)
• i810_enable_cursor(9)
• i810_init_cursor(9)
• i810_round_off(9)
• set_color_bitfields(9)
• i810_check_params(9)
• encode_fix(9)
• decode_var(9)
• i810fb_getcolreg(9)
• i810_init_monspecs(9)
• i810_init_defaults(9)
• i810_init_device(9)

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mwah 💋 source/version path is ./drivers/video/fbdev/i810, and the date stamp is October 2026 — iconic footer behavior, fr fr. 🫶🌸