drm/radeon/kms/avivo: add support for new pll selection algo
Supported on all AVIVO-based asics.
Can be disabled via the new_pll module parameter:
new_pll=0 - disable
new_pll=1 - enable
enabled by default
[airlied: fixed to use do_div]
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index f099ce2..a133b83 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -560,6 +560,98 @@
*post_div_p = best_post_div;
}
+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,
+ int flags)
+{
+ 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);
+ ffreq.full = rfixed_const(freq);
+ error.full = rfixed_const(100 * 100);
+
+ /* max p */
+ p.full = rfixed_div(pll_out_max, ffreq);
+ p.full = rfixed_floor(p);
+
+ /* min m */
+ m.full = rfixed_div(reference_freq, pll_in_max);
+ m.full = rfixed_ceil(m);
+
+ while (1) {
+ n.full = rfixed_div(ffreq, reference_freq);
+ n.full = rfixed_mul(n, m);
+ n.full = rfixed_mul(n, p);
+
+ f_vco.full = rfixed_div(n, m);
+ f_vco.full = rfixed_mul(f_vco, reference_freq);
+
+ f_pclk.full = rfixed_div(f_vco, p);
+
+ 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;
+
+ 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;
+ }
+ }
+
+ a.full = rfixed_const(10);
+ b.full = rfixed_mul(n, a);
+
+ frac_n.full = rfixed_floor(n);
+ frac_n.full = rfixed_mul(frac_n, a);
+ frac_n.full = b.full - frac_n.full;
+
+ *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);
+
+ 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);
+}
+
static void radeon_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
struct radeon_framebuffer *radeon_fb = to_radeon_framebuffer(fb);