[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=91861

--- Comment #4 from Mike S. <michael.selig at fs.com.au> ---
I haven't yet tested the patch to cap ref_div to 7, but here are the values
reported with drm.debug=0xE, in case they are useful:

1. Kernel 3.14 (working):
14851, fb: 145.2 ref: 2, post: 7

2. Kernel 3.18 (not working):
148500 - 148500, fb: 1016.3 ref: 14, post: 7

I am no expert, but looking at the code, a ref_div value of 14 seems wrong. In
r600d.h the REF_DIV_MASK is only 3 bits wide, so the max value it should ever
be is 7, right?

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