xf86-video-intel/src/scripts/clock-graph.5c

autoload Cairo;
import Cairo;
library "examples/sort.5c";
import Sort;

int width = 1000, height = 200;
int min_vco = 1400000000;
int max_vco = 2800000000;
int min = 0xffffffff;
int max = 0;

int max_clocks = 2000;
int[4][max_clocks] clocks;
int[4][max_clocks] vcos;
int[4] clock_count = {0...};

int[4] p2vals = {5,10,7,14};

cairo_t cr = Cairo::new(width, height);

void calc_p2(int p2i)
{
	int p2 = p2vals[p2i];
	int min_p, max_p;

	clocks[p2i] = (int [max_clocks]){0...};

		if (p2 == 7 || p2 == 14) {
		/* LVDS */
		min_p = 7;
		max_p = 98;
	} else {
		/* SDVO/DAC */
		min_p = 5;
		max_p = 80;
	}

	for (int m1 = 10; m1 <= 22; m1++) {
		for (int m2 = 5; m2 <= 9; m2++) {
			for (int n = 1; n <= 5; n++) {
				for (int p1 = 1; p1 <= 8; p1++) {
					int ref = 96000000;
					int m = 5 * (m1 + 2) + (m2 + 2);
					int p = p1 * p2;
					int vco = floor(ref * m / (n + 2));
					int clock = floor(vco / p);

					if (p < min_p || p > max_p)
						continue;
					if (m < 70 || m > 120)
						continue;
					if (m2 > m1)
						continue; /* won't happen */
					if (vco < min_vco || vco > max_vco)
						continue;

/*
					printf("clock: %d (%d,%d), %d, "
						"(%d,%d)\n",
						floor(clock / 1000),
						m1, m2, n, p1, p2);
*/

					clocks[p2i][clock_count[p2i]] = clock;
					vcos[p2i][clock_count[p2i]] = vco;
					clock_count[p2i]++;
				}
			}
		}
	}
}

bool sort_p2(poly a, poly b)
{
	return a > b;
}

int min_rate = 25000 * 1000;
int max_rate = 200000 * 1000;

real scale_x(real clock)
{
	int min_x = 75, max_x = width - 50;

	real frac = (clock - min_rate) / (max_rate - min_rate);

	return min_x + frac * (max_x - min_x);
}

for (p2i = 0; p2i < dim(p2vals); p2i++) {
	int p2 = p2vals[p2i]; 
	calc_p2(p2i);
	real row_y1 = (p2i + 1) / (dim(p2vals) + 1) * height;
	real row_y2 = p2i / (dim(p2vals) + 1) * height;

	/*qsort(&p2vals[p2i], sort_p2);*/

	switch (p2) {
	case 5:
		set_source_rgb(cr, 1,0,0);
		break;
	case 10:
		set_source_rgb(cr, 0,1,0);
		break;
	case 7:
		set_source_rgb(cr, 0,0,1);
		break;
	case 14:
		set_source_rgb(cr, 0,0,0);
		break;
	}

	/* draw the line for the clock */
	for (int i = 0; i < clock_count[p2i]; i++) {
		int clock = clocks[p2i][i];
		real xpos;

		if (clock < min_rate || clock > max_rate)
			continue;

		xpos = scale_x(clock);
		move_to(cr, xpos, row_y1);
		line_to(cr, xpos, row_y2);
		stroke(cr);
	}

	set_source_rgb(cr, 1, 1, 1);
	/* add a mark for the vco value of the clocks at each location */
	for (int i = 0; i < clock_count[p2i]; i++) {
		int clock = clocks[p2i][i];
		int vco = vcos[p2i][i];
		real mark_center;

		if (clock < min_rate || clock > max_rate)
			continue;

		real xpos = scale_x(clock);
		real vcofrac = (vco - min_vco) / (max_vco - min_vco);
		real mark_height = (row_y1 + vcofrac * (row_y2 - row_y1));

		move_to(cr, xpos, mark_height - 1);
		line_to(cr, xpos, mark_height + 1);
		stroke(cr);
	}

	set_source_rgb(cr, 0, 0, 0);
	string p2label = sprintf("p2 = %d", p2);
	move_to(cr, 5, (p2i + .5) / (dim(p2vals) + 1) * height + 4);
	show_text(cr, p2label);
}

void label_clock(real clock) {
	real center_x = scale_x(clock);
	string label = sprintf("%d", floor((clock + 500) / 1000000));
		text_extents_t e = text_extents(cr, label);
	real left_x = center_x - e.x_advance / 2;
	save(cr);
	move_to(cr, left_x, height - 20);
	show_text(cr, label);
	restore(cr);
}

label_clock(min_rate);
label_clock(max_rate);
label_clock(140 * 1000 * 1000);
label_clock(115 * 1000 * 1000);
label_clock(100 * 1000 * 1000);
label_clock(82 * 1000 * 1000);

string xlabel = "Clock in Mhz";
text_extents_t e = text_extents(cr, xlabel);
move_to(cr, width / 2 - e.x_advance / 2, height - 5);
show_text(cr, xlabel);
sleep(10);