drm/radeon/kms: use lcd pll limits when available
The bios has alternate pll output limits for LCD panels.
If available, use these for pll divider calculations.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index ba8d806..ff5f099 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -469,10 +469,19 @@
uint32_t best_error = 0xffffffff;
uint32_t best_vco_diff = 1;
uint32_t post_div;
+ u32 pll_out_min, pll_out_max;
DRM_DEBUG("PLL freq %llu %u %u\n", freq, pll->min_ref_div, pll->max_ref_div);
freq = freq * 1000;
+ if (pll->flags & RADEON_PLL_IS_LCD) {
+ pll_out_min = pll->lcd_pll_out_min;
+ pll_out_max = pll->lcd_pll_out_max;
+ } else {
+ pll_out_min = pll->pll_out_min;
+ pll_out_max = pll->pll_out_max;
+ }
+
if (pll->flags & RADEON_PLL_USE_REF_DIV)
min_ref_div = max_ref_div = pll->reference_div;
else {
@@ -536,10 +545,10 @@
tmp = (uint64_t)pll->reference_freq * feedback_div;
vco = radeon_div(tmp, ref_div);
- if (vco < pll->pll_out_min) {
+ if (vco < pll_out_min) {
min_feed_div = feedback_div + 1;
continue;
- } else if (vco > pll->pll_out_max) {
+ } else if (vco > pll_out_max) {
max_feed_div = feedback_div;
continue;
}
@@ -675,6 +684,15 @@
{
fixed20_12 ffreq, max_error, error, pll_out, a;
u32 vco;
+ u32 pll_out_min, pll_out_max;
+
+ if (pll->flags & RADEON_PLL_IS_LCD) {
+ pll_out_min = pll->lcd_pll_out_min;
+ pll_out_max = pll->lcd_pll_out_max;
+ } else {
+ pll_out_min = pll->pll_out_min;
+ pll_out_max = pll->pll_out_max;
+ }
ffreq.full = rfixed_const(freq);
/* max_error = ffreq * 0.0025; */
@@ -686,7 +704,7 @@
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))
+ if ((vco < pll_out_min) || (vco > pll_out_max))
continue;
/* pll_out = vco / post_div; */
@@ -714,6 +732,15 @@
{
u32 fb_div = 0, fb_div_frac = 0, post_div = 0, ref_div = 0;
u32 best_freq = 0, vco_frequency;
+ u32 pll_out_min, pll_out_max;
+
+ if (pll->flags & RADEON_PLL_IS_LCD) {
+ pll_out_min = pll->lcd_pll_out_min;
+ pll_out_max = pll->lcd_pll_out_max;
+ } else {
+ pll_out_min = pll->pll_out_min;
+ pll_out_max = pll->pll_out_max;
+ }
/* freq = freq / 10; */
do_div(freq, 10);
@@ -724,7 +751,7 @@
goto done;
vco_frequency = freq * post_div;
- if ((vco_frequency < pll->pll_out_min) || (vco_frequency > pll->pll_out_max))
+ if ((vco_frequency < pll_out_min) || (vco_frequency > pll_out_max))
goto done;
if (pll->flags & RADEON_PLL_USE_REF_DIV) {
@@ -749,7 +776,7 @@
continue;
vco_frequency = freq * post_div;
- if ((vco_frequency < pll->pll_out_min) || (vco_frequency > pll->pll_out_max))
+ if ((vco_frequency < pll_out_min) || (vco_frequency > pll_out_max))
continue;
if (pll->flags & RADEON_PLL_USE_REF_DIV) {
ref_div = pll->reference_div;