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* add varying PLL calculations as directed by AtomBIOS

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* don't set referenceDivider as minimum unless directed to by
  AtomBIOS


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42873 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Alexander von Gluck IV 2011-10-17 14:13:42 +00:00
parent 4254fc3705
commit 05a2fee650
1 changed files with 38 additions and 20 deletions
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58
src/add-ons/accelerants/radeon_hd/pll.cpp
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@ -127,8 +127,10 @@ pll_compute_post_divider(pll_info *pll)
{
radeon_shared_info &info = *gInfo->shared_info;
if ((pll->flags & PLL_USE_POST_DIV) != 0)
if ((pll->flags & PLL_USE_POST_DIV) != 0) {
TRACE("%s: using AtomBIOS post divider\n", __func__);
return;
}
uint32 vco;
if (info.device_chipset < (RADEON_R700 | 0x70)) {
@ -175,27 +177,43 @@ pll_compute(pll_info *pll)
pll->feedbackDiv = 0;
pll->feedbackDivFrac = 0;
pll->referenceDiv = pll->minRefDiv;
uint32 referenceFrequency = pll->referenceFreq;
// if RADEON_PLL_USE_REF_DIV
// ref_div = pll->reference_div;
if ((pll->flags & PLL_USE_REF_DIV) != 0) {
TRACE("%s: using AtomBIOS reference divider\n", __func__);
return B_OK;
} else {
pll->referenceDiv = pll->minRefDiv;
}
if ((pll->flags & PLL_USE_FRAC_FB_DIV) != 0) {
TRACE("%s: using AtomBIOS fractional feedback divider\n", __func__);
uint32 tmp = pll->postDiv * pll->referenceDiv;
tmp *= targetClock;
pll->feedbackDiv = tmp / pll->referenceFreq;
pll->feedbackDivFrac = tmp % pll->referenceFreq;
if (pll->feedbackDiv > pll->maxFeedbackDiv)
pll->feedbackDiv = pll->maxFeedbackDiv;
else if (pll->feedbackDiv < pll->minFeedbackDiv)
pll->feedbackDiv = pll->minFeedbackDiv;
pll->feedbackDivFrac
= (100 * pll->feedbackDivFrac) / pll->referenceFreq;
if (pll->feedbackDivFrac >= 5) {
pll->feedbackDivFrac -= 5;
pll->feedbackDivFrac /= 10;
pll->feedbackDivFrac++;
}
if (pll->feedbackDivFrac >= 10) {
pll->feedbackDiv++;
pll->feedbackDivFrac = 0;
}
} else {
TRACE("%s: performing fractional feedback calculations\n", __func__);
// if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV) {
// avivo_get_fb_div(pll, targetClock, postDivider, referenceDivider,
// &feedbackDivider, &feedbackDividerFrac);
// feedbackDividerFrac = (100 * feedbackDividerFrac) / pll->reference_freq;
// if (frac_fb_div >= 5) {
// frac_fb_div -= 5;
// frac_fb_div = frac_fb_div / 10;
// frac_fb_div++;
// }
// if (frac_fb_div >= 10) {
// fb_div++;
// frac_fb_div = 0;
// }
// } else {
while (pll->referenceDiv <= pll->maxRefDiv) {
// get feedback divider
uint32 retroEncabulator = pll->postDiv * pll->referenceDiv;
@ -235,7 +253,7 @@ pll_compute(pll_info *pll)
else
pll->referenceDiv++;
}
// }
}
if (pll->referenceDiv == 0 || pll->postDiv == 0) {
TRACE("%s: Caught division by zero of post or reference divider\n",