<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AMD Fusion E-350] HDMI refresh rates doesn't match expectations"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76564#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [AMD Fusion E-350] HDMI refresh rates doesn't match expectations"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76564">bug 76564</a>
from <span class="vcard"><a class="email" href="mailto:jeroenk61@hotmail.com" title="jeroen <jeroenk61@hotmail.com>"> <span class="fn">jeroen</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=76564#c14">comment #14</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=76564#c13">comment #13</a>)
> > Do the PLL values in the log files I posted indicate a problem, or are they
> > okay?
>
> [drm:radeon_compute_pll_avivo], 14875, pll dividers - fb: 23.8 ref: 2, post 8
> [drm:radeon_compute_pll_avivo], 7406, pll dividers - fb: 23.7 ref: 2, post 16
>
> The display pll looks fine to me. The clock formula is:
>
> pixel_clock = (reference_frequency * feedback_divider) / (reference_divider
> * post_divider)
>
> The reference frequency is 100 Mhz, so:
>
> (100Mhz * 23.8) / (2 * 8) = 148.75Mhz
>
> (100Mhz * 23.7) / (2 * 16) = 74.0625Mhz
>
> >
> > How can you see the PLL values fglrx is using?
>
> You'd need to dump the PLL registers using radeonreg
> (<a href="http://cgit.freedesktop.org/~airlied/radeontool/">http://cgit.freedesktop.org/~airlied/radeontool/</a>).
> PPLL1
> 0x400 - ref div - bits 9:0
> 0x404 - fb div - whole part bits 26:16, fractional part bits 3:0
> 0x408 - post div - bits 6:0
> PPLL2
> 0x440 - ref div - bits 9:0
> 0x444 - fb div - whole part bits 26:16, fractional part bits 3:0
> 0x448 - post div - bits 6:0
>
> e.g., ./radeonreg regmatch 0x400</span >
I got the results with fglrx:
PPLL1@50Hz: fb=23.7 ref=2 post=6
PPLL2@50Hz: fb=296.16 ref=7 post=6
<a href="mailto:PPLL1@23.976Hz">PPLL1@23.976Hz</a>: fb=23.7 ref=2 post=12
<a href="mailto:PPLL2@23.976Hz">PPLL2@23.976Hz</a>: fb=296.16 ref=7 post=6
PPLL2 does seem to be used as it does not change. PPLL1 has different values
than with the radeon OSS driver. What does this mean?</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>