*post_div_p = best_post_div;
}
-static void radeon_compute_pll_avivo(struct radeon_pll *pll,
- uint64_t freq,
- uint32_t *dot_clock_p,
- uint32_t *fb_div_p,
- uint32_t *frac_fb_div_p,
- uint32_t *ref_div_p,
- uint32_t *post_div_p)
+static bool
+calc_fb_div(struct radeon_pll *pll,
+ uint32_t freq,
+ uint32_t post_div,
+ uint32_t ref_div,
+ uint32_t *fb_div,
+ uint32_t *fb_div_frac)
{
- fixed20_12 m, n, frac_n, p, f_vco, f_pclk, best_freq;
- fixed20_12 pll_out_max, pll_out_min;
- fixed20_12 pll_in_max, pll_in_min;
- fixed20_12 reference_freq;
- fixed20_12 error, ffreq, a, b;
-
- pll_out_max.full = rfixed_const(pll->pll_out_max);
- pll_out_min.full = rfixed_const(pll->pll_out_min);
- pll_in_max.full = rfixed_const(pll->pll_in_max);
- pll_in_min.full = rfixed_const(pll->pll_in_min);
- reference_freq.full = rfixed_const(pll->reference_freq);
- do_div(freq, 10);
+ fixed20_12 feedback_divider, a, b;
+ u32 vco_freq;
+
+ vco_freq = freq * post_div;
+ /* feedback_divider = vco_freq * ref_div / pll->reference_freq; */
+ a.full = rfixed_const(pll->reference_freq);
+ feedback_divider.full = rfixed_const(vco_freq);
+ feedback_divider.full = rfixed_div(feedback_divider, a);
+ a.full = rfixed_const(ref_div);
+ feedback_divider.full = rfixed_mul(feedback_divider, a);
+
+ if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV) {
+ /* feedback_divider = floor((feedback_divider * 10.0) + 0.5) * 0.1; */
+ a.full = rfixed_const(10);
+ feedback_divider.full = rfixed_mul(feedback_divider, a);
+ feedback_divider.full += rfixed_const_half(0);
+ feedback_divider.full = rfixed_floor(feedback_divider);
+ feedback_divider.full = rfixed_div(feedback_divider, a);
+
+ /* *fb_div = floor(feedback_divider); */
+ a.full = rfixed_floor(feedback_divider);
+ *fb_div = rfixed_trunc(a);
+ /* *fb_div_frac = fmod(feedback_divider, 1.0) * 10.0; */
+ a.full = rfixed_const(10);
+ b.full = rfixed_mul(feedback_divider, a);
+
+ feedback_divider.full = rfixed_floor(feedback_divider);
+ feedback_divider.full = rfixed_mul(feedback_divider, a);
+ feedback_divider.full = b.full - feedback_divider.full;
+ *fb_div_frac = rfixed_trunc(feedback_divider);
+ } else {
+ /* *fb_div = floor(feedback_divider + 0.5); */
+ feedback_divider.full += rfixed_const_half(0);
+ feedback_divider.full = rfixed_floor(feedback_divider);
+
+ *fb_div = rfixed_trunc(feedback_divider);
+ *fb_div_frac = 0;
+ }
+
+ if (((*fb_div) < pll->min_feedback_div) || ((*fb_div) > pll->max_feedback_div))
+ return false;
+ else
+ return true;
+}
+
+static bool
+calc_fb_ref_div(struct radeon_pll *pll,
+ uint32_t freq,
+ uint32_t post_div,
+ uint32_t *fb_div,
+ uint32_t *fb_div_frac,
+ uint32_t *ref_div)
+{
+ fixed20_12 ffreq, max_error, error, pll_out, a;
+ u32 vco;
+
ffreq.full = rfixed_const(freq);
- error.full = rfixed_const(100 * 100);
+ /* max_error = ffreq * 0.0025; */
+ a.full = rfixed_const(400);
+ max_error.full = rfixed_div(ffreq, a);
+
+ for ((*ref_div) = pll->min_ref_div; (*ref_div) < pll->max_ref_div; ++(*ref_div)) {
+ if (calc_fb_div(pll, freq, post_div, (*ref_div), fb_div, fb_div_frac)) {
+ vco = pll->reference_freq * (((*fb_div) * 10) + (*fb_div_frac));
+ vco = vco / ((*ref_div) * 10);
+
+ if ((vco < pll->pll_out_min) || (vco > pll->pll_out_max))
+ continue;
- /* max p */
- p.full = rfixed_div(pll_out_max, ffreq);
- p.full = rfixed_floor(p);
+ /* pll_out = vco / post_div; */
+ a.full = rfixed_const(post_div);
+ pll_out.full = rfixed_const(vco);
+ pll_out.full = rfixed_div(pll_out, a);
- /* min m */
- m.full = rfixed_div(reference_freq, pll_in_max);
- m.full = rfixed_ceil(m);
+ if (pll_out.full >= ffreq.full) {
+ error.full = pll_out.full - ffreq.full;
+ if (error.full <= max_error.full)
+ return true;
+ }
+ }
+ }
+ return false;
+}
- while (1) {
- n.full = rfixed_div(ffreq, reference_freq);
- n.full = rfixed_mul(n, m);
- n.full = rfixed_mul(n, p);
+static void radeon_compute_pll_new(struct radeon_pll *pll,
+ uint64_t freq,
+ uint32_t *dot_clock_p,
+ uint32_t *fb_div_p,
+ uint32_t *frac_fb_div_p,
+ uint32_t *ref_div_p,
+ uint32_t *post_div_p)
+{
+ u32 fb_div = 0, fb_div_frac = 0, post_div = 0, ref_div = 0;
+ u32 best_freq = 0, vco_frequency;
- f_vco.full = rfixed_div(n, m);
- f_vco.full = rfixed_mul(f_vco, reference_freq);
+ /* freq = freq / 10; */
+ do_div(freq, 10);
- f_pclk.full = rfixed_div(f_vco, p);
+ if (pll->flags & RADEON_PLL_USE_POST_DIV) {
+ post_div = pll->post_div;
+ if ((post_div < pll->min_post_div) || (post_div > pll->max_post_div))
+ goto done;
+
+ vco_frequency = freq * post_div;
+ if ((vco_frequency < pll->pll_out_min) || (vco_frequency > pll->pll_out_max))
+ goto done;
+
+ if (pll->flags & RADEON_PLL_USE_REF_DIV) {
+ ref_div = pll->reference_div;
+ if ((ref_div < pll->min_ref_div) || (ref_div > pll->max_ref_div))
+ goto done;
+ if (!calc_fb_div(pll, freq, post_div, ref_div, &fb_div, &fb_div_frac))
+ goto done;
+ }
+ } else {
+ for (post_div = pll->max_post_div; post_div >= pll->min_post_div; --post_div) {
+ if (pll->flags & RADEON_PLL_LEGACY) {
+ if ((post_div == 5) ||
+ (post_div == 7) ||
+ (post_div == 9) ||
+ (post_div == 10) ||
+ (post_div == 11))
+ continue;
+ }
- if (f_pclk.full > ffreq.full)
- error.full = f_pclk.full - ffreq.full;
- else
- error.full = ffreq.full - f_pclk.full;
- error.full = rfixed_div(error, f_pclk);
- a.full = rfixed_const(100 * 100);
- error.full = rfixed_mul(error, a);
-
- a.full = rfixed_mul(m, p);
- a.full = rfixed_div(n, a);
- best_freq.full = rfixed_mul(reference_freq, a);
-
- if (rfixed_trunc(error) < 25)
- break;
-
- a.full = rfixed_const(1);
- m.full = m.full + a.full;
- a.full = rfixed_div(reference_freq, m);
- if (a.full >= pll_in_min.full)
- continue;
+ if ((pll->flags & RADEON_PLL_NO_ODD_POST_DIV) && (post_div & 1))
+ continue;
- m.full = rfixed_div(reference_freq, pll_in_max);
- m.full = rfixed_ceil(m);
- a.full= rfixed_const(1);
- p.full = p.full - a.full;
- a.full = rfixed_mul(p, ffreq);
- if (a.full >= pll_out_min.full)
- continue;
- else {
- DRM_ERROR("Unable to find pll dividers\n");
- break;
+ vco_frequency = freq * post_div;
+ if ((vco_frequency < pll->pll_out_min) || (vco_frequency > pll->pll_out_max))
+ continue;
+ if (pll->flags & RADEON_PLL_USE_REF_DIV) {
+ ref_div = pll->reference_div;
+ if ((ref_div < pll->min_ref_div) || (ref_div > pll->max_ref_div))
+ goto done;
+ if (calc_fb_div(pll, freq, post_div, ref_div, &fb_div, &fb_div_frac))
+ break;
+ } else {
+ if (calc_fb_ref_div(pll, freq, post_div, &fb_div, &fb_div_frac, &ref_div))
+ break;
+ }
}
}
- a.full = rfixed_const(10);
- b.full = rfixed_mul(n, a);
+ best_freq = pll->reference_freq * 10 * fb_div;
+ best_freq += pll->reference_freq * fb_div_frac;
+ best_freq = best_freq / (ref_div * post_div);
- frac_n.full = rfixed_floor(n);
- frac_n.full = rfixed_mul(frac_n, a);
- frac_n.full = b.full - frac_n.full;
+done:
+ if (best_freq == 0)
+ DRM_ERROR("Couldn't find valid PLL dividers\n");
- *dot_clock_p = rfixed_trunc(best_freq);
- *fb_div_p = rfixed_trunc(n);
- *frac_fb_div_p = rfixed_trunc(frac_n);
- *ref_div_p = rfixed_trunc(m);
- *post_div_p = rfixed_trunc(p);
+ *dot_clock_p = best_freq / 10;
+ *fb_div_p = fb_div;
+ *frac_fb_div_p = fb_div_frac;
+ *ref_div_p = ref_div;
+ *post_div_p = post_div;
- DRM_DEBUG("%u %d.%d, %d, %d\n", *dot_clock_p * 10, *fb_div_p, *frac_fb_div_p, *ref_div_p, *post_div_p);
+ DRM_DEBUG("%u %d.%d, %d, %d\n", *dot_clock_p, *fb_div_p, *frac_fb_div_p, *ref_div_p, *post_div_p);
}
void radeon_compute_pll(struct radeon_pll *pll,
uint32_t *post_div_p)
{
switch (pll->algo) {
- case PLL_ALGO_AVIVO:
- radeon_compute_pll_avivo(pll, freq, dot_clock_p, fb_div_p,
- frac_fb_div_p, ref_div_p, post_div_p);
+ case PLL_ALGO_NEW:
+ radeon_compute_pll_new(pll, freq, dot_clock_p, fb_div_p,
+ frac_fb_div_p, ref_div_p, post_div_p);
break;
case PLL_ALGO_LEGACY:
default:
projects / deliverable / linux.git / blobdiff