2010/3/17 Michel Dänzer <mic...@daenzer.net>:
> On Tue, 2010-03-16 at 10:56 -0400, Alex Deucher wrote:
>> 2010/3/16 Michel Dänzer <mic...@daenzer.net>:
>> >
>> > Commit 96a4c8d50de20da865296a380b996f73204d6b34 ('drm/radeon/kms: fix
>> > i2c prescale calc on older radeons') breaks LVDS on my RV350 PowerBook
>> > again. Reverting just that commit on top of drm-radeon-testing commit
>> > 589468458fa964c2020e23e4d9353be2ef8bd3be fixes it.
>> >
>>
>> Do any of the suggestions on bug 26430 help?
>> http://bugs.freedesktop.org/show_bug.cgi?id=26430
>
> I've tried i2c_clock = 50/10/100 and m = loop - 1, no luck. I also added
> debugging output to verify that sclk seems sane the calculations seem to
> take effect as expected:
>
> [ 59.138772] [drm] sclk=44550
> [ 59.138775] [drm] nm=2227
> [ 59.138779] [drm] loop=48 n=47 m=46 => prescale=0x00002f2e
>
>
> So, did that commit actually fix anything? :} It regresses at least for
> me and doesn't seem to help for the bug it claims it 'should fix'...
It fixed r1xx for me. Also, the prescale is actually applied to the
sclk, to I think it was just luck that it worked with the reference
clock. It just happened to be the right combination of numbers...
All my cards worked fine with both algos :/
Alex
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