[Bug 100755] [HSW] linux next-20170407+ boots to a blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100755

--- Comment #7 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to Maarten Lankhorst from comment #6)
> Curious thing..
> 
> >>> 2428257. / 8388608
> 0.28947
> 
> >>>  302776. / 1048576
> 0.28874
> 
> >>> 2428257. / 8
> 303532.125
> 
> So this might be some rounding error?
> 
> same for link_m/n, expected 33725, got 33641.

33641/131072=0.2567 is closer to the original pixel_clock/link_clock ratio
(69300/270000=0.2567) than 33725/131072=0.2573.

Also, in the attachment (next-20170324 with fastboot=1, shows suspend/resume,
works fine) bios programs link_m: 134903 whereas driver programs link_m:
134567. Because both work fine, I guess the problem  is elsewhere.

I wonder if we should not be scaling down data m/n at all. The patch scales
both data and link m/n to workaround a dongle issue, we could probably just
scale down only link m/n since data m/n is for internal use.

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