/* Estimate the pixel gain of PRISM enhancement and soft-clipping algorithm*/
static u32 nvsd_softclip(fixed20_12 pixel, fixed20_12 k, fixed20_12 th)
{
fixed20_12 num, f;
if (pixel.full >= th.full) {
num.full = pixel.full - th.full;
f.full = dfixed_const(1) - dfixed_div(num, th);
} else {
f.full = dfixed_const(1);
}
num.full = dfixed_mul(pixel, f);
f.full = dfixed_mul(num, k);
num.full = pixel.full + f.full;
return min_t(u32, num.full, dfixed_const(255));
}
int
nv50_calc_pll2(struct drm_device *dev, struct pll_lims *pll, int clk,
int *N, int *fN, int *M, int *P)
{
fixed20_12 fb_div, a, b;
*P = pll->vco1.maxfreq / clk;
if (*P > pll->max_p)
*P = pll->max_p;
if (*P < pll->min_p)
*P = pll->min_p;
/* *M = ceil(refclk / pll->vco.max_inputfreq); */
a.full = dfixed_const(pll->refclk);
b.full = dfixed_const(pll->vco1.max_inputfreq);
a.full = dfixed_div(a, b);
a.full = dfixed_ceil(a);
*M = dfixed_trunc(a);
/* fb_div = (vco * *M) / refclk; */
fb_div.full = dfixed_const(clk * *P);
fb_div.full = dfixed_mul(fb_div, a);
a.full = dfixed_const(pll->refclk);
fb_div.full = dfixed_div(fb_div, a);
/* *N = floor(fb_div); */
a.full = dfixed_floor(fb_div);
*N = dfixed_trunc(fb_div);
/* *fN = (fmod(fb_div, 1.0) * 8192) - 4096; */
b.full = dfixed_const(8192);
a.full = dfixed_mul(a, b);
fb_div.full = dfixed_mul(fb_div, b);
fb_div.full = fb_div.full - a.full;
*fN = dfixed_trunc(fb_div) - 4096;
*fN &= 0xffff;
return clk;
}
static int nvsd_set_brightness(struct tegra_dc *dc)
{
u32 bin_width;
int i, j;
int val;
int pix;
int bin_idx;
int incr;
int base;
u32 histo[32];
u32 histo_total = 0; /* count of pixels */
fixed20_12 nonhisto_gain; /* gain of pixels not in histogram */
fixed20_12 est_achieved_gain; /* final gain of pixels */
fixed20_12 histo_gain = dfixed_init(0); /* gain of pixels */
fixed20_12 k, threshold; /* k is the fractional part of HW_K */
fixed20_12 den, num, out;
fixed20_12 pix_avg, pix_avg_softclip;
/* Collet the inputs of the algorithm */
for (i = 0; i < DC_DISP_SD_HISTOGRAM_NUM; i++) {
val = tegra_dc_readl(dc, DC_DISP_SD_HISTOGRAM(i));
for (j = 0; j < 4; j++)
histo[i * 4 + j] = SD_HISTOGRAM_BIN(val, (j * 8));
}
val = tegra_dc_readl(dc, DC_DISP_SD_HW_K_VALUES);
k.full = dfixed_const(SD_HW_K_R(val));
den.full = dfixed_const(1024);
k.full = dfixed_div(k, den);
val = tegra_dc_readl(dc, DC_DISP_SD_SOFT_CLIPPING);
threshold.full = dfixed_const(SD_SOFT_CLIPPING_THRESHOLD(val));
val = tegra_dc_readl(dc, DC_DISP_SD_CONTROL);
bin_width = SD_BIN_WIDTH_VAL(val);
incr = 1 << bin_width;
base = 256 - 32 * incr;
for (pix = base, bin_idx = 0; pix < 256; pix += incr, bin_idx++) {
num.full = dfixed_const(pix + pix + incr);
den.full = dfixed_const(2);
pix_avg.full = dfixed_div(num, den);
pix_avg_softclip.full = nvsd_softclip(pix_avg, k, threshold);
num.full = dfixed_const(histo[bin_idx]);
den.full = dfixed_const(256);
out.full = dfixed_div(num, den);
num.full = dfixed_mul(out, pix_avg_softclip);
out.full = dfixed_div(num, pix_avg);
histo_gain.full += out.full;
histo_total += histo[bin_idx];
}
out.full = dfixed_const(256 - histo_total);
den.full = dfixed_const(1) + k.full;
num.full = dfixed_mul(out, den);
den.full = dfixed_const(256);
nonhisto_gain.full = dfixed_div(num, den);
den.full = nonhisto_gain.full + histo_gain.full;
num.full = dfixed_const(1);
out.full = dfixed_div(num, den);
num.full = dfixed_const(255);
est_achieved_gain.full = dfixed_mul(num, out);
val = dfixed_trunc(est_achieved_gain);
return nvsd_backlght_interplate(val, 128);
}
