[Bug 75241] radeon_compute_pll_avivo broken in 3.15-rc3

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=75241

Dan Merillat <bugzilla@dan.merillat.org> changed:

           What    |Removed                     |Added
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                 CC|                            |bugzilla@dan.merillat.org

--- Comment #25 from Dan Merillat <bugzilla@dan.merillat.org> ---
Unfortunately, I had to set this down to 32 to work on my system.

Radeon HD 3200 (onboard, RS780)
Monitor Viewsonic G225f
Kernel 3.16-rc3

Nonworking:
[drm:radeon_compute_pll_avivo] 229500 - 229500, pll dividers - fb: 1602.7 ref:
25, post 4

Working:
[drm:radeon_compute_pll_avivo] 229500 - 229500, pll dividers - fb: 240.4 ref:
3, post 5

CRTs are getting increasingly rare - perhaps a tunable for this so us fogies
with 100 pound monitors can set it where it works on our system?  For me, it's
a trivial patch to carry forward but setting something like
drm.ref_div_tweak=32 in my grub config would be easier.

I haven't been able to use a kernel since commit 3216701   drm/radeon: rework
finding display PLL numbers v2.

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