[Bug 77673] New: [bisected] moving moire starting with "drm/radeon: improve PLL params if we don't match exactly v2"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77673

          Priority: medium
            Bug ID: 77673
          Assignee: dri-devel at lists.freedesktop.org
           Summary: [bisected] moving moire starting with "drm/radeon:
                    improve PLL params if we don't match exactly v2"
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jsagarribay at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: DRI CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 97606
  --> https://bugs.freedesktop.org/attachment.cgi?id=97606&action=edit
Output of 'xrandr --prop'

Hello, I'm testing drm-next and have found this problem. The display shows some
kind of moving wavy pattern, noticeable in midtones and grandients. I've
bisected it to the mentioned commit. The display is the internal LVDS panel, I
haven't tested external displays.


$ git bisect log
git bisect start
# good: [aa3a38dd40b610de206fb04777cc5469ce057de8] drm/radeon: update CI DPM
powertune settings
git bisect good aa3a38dd40b610de206fb04777cc5469ce057de8
# bad: [bc00aa0ebfed7edc1ca91ec2d9b0d5b04c5e06a8] drm: bochs: drop unused
struct fields
git bisect bad bc00aa0ebfed7edc1ca91ec2d9b0d5b04c5e06a8
# bad: [8bf5dda3777f2a477e3c448b38e18f5e1b502eae] drm/radeon/si: make sure mc
ucode is loaded before checking the size
git bisect bad 8bf5dda3777f2a477e3c448b38e18f5e1b502eae
# good: [8a6a70662fc93c2c43ba48de3e46bf7e860e18cc] drm/radeon: re-enable mclk
dpm on R7 260X asics
git bisect good 8a6a70662fc93c2c43ba48de3e46bf7e860e18cc
# good: [aeb0c2d8d3fc60ea931f807275166ea8abe1feeb] drm/radeon: memory leak on
bo reservation failure. v2
git bisect good aeb0c2d8d3fc60ea931f807275166ea8abe1feeb
# bad: [9b17c2afd74b5f56497ffacbcac85ee2cf0a1c1b] drm/radeon: improve PLL
params if we don't match exactly v2
git bisect bad 9b17c2afd74b5f56497ffacbcac85ee2cf0a1c1b
# first bad commit: [9b17c2afd74b5f56497ffacbcac85ee2cf0a1c1b] drm/radeon:
improve PLL params if we don't match exactly v2

(the commit ID are local, as I've rebased drm-next and drm-fixes on v3.14).

I attach two kernel logs booting and doing:
echo 0xe >/sys/module/drm/parameters/debug
xrand --rate 50
xrand --rate 60

I think the relevant difference is (first line is good, next is buggy):
- [drm:radeon_compute_pll_avivo] 122000 - 13725, pll dividers - fb: 122.0 ref:
6, post 4
+ [drm:radeon_compute_pll_avivo] 122000 - 12198, pll dividers - fb: 126.5 ref:
7, post 4

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