[Bug 71141] New: [drm:radeon_uvd_send_upll_ctlreq] *ERROR* Timeout setting UVD clocks

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https://bugzilla.kernel.org/show_bug.cgi?id=71141

            Bug ID: 71141
           Summary: [drm:radeon_uvd_send_upll_ctlreq] *ERROR* Timeout
                    setting UVD clocks
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13.5-1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mystery.wd@gmail.com
        Regression: No

Created attachment 127361
  --> https://bugzilla.kernel.org/attachment.cgi?id=127361&action=edit
kernel log

Hello,

I'm using HP 1220tx Laptop with AMD HD8750M graphics card. Kernel keeps
complaining about setting UVD clocks and whole system stalls about 1 sec when
probing the UVD clocks. I've read the bug report here which reported exact same
problem for HD4570M: https://bugzilla.kernel.org/show_bug.cgi?id=60858 , but
the solution given doesn't help much...

According to that report, I did some research myself:
1. dump of the registers 0x0718, 0x071c and 0x0720
0x0718    0x00000031 (49)
0x071c    0xc080001c (-1065353188)
0x0720    0x3158680e (827877390)
2. fb_div=970296,vclk_div=3,dclk_div=4 at function si_set_uvd_clocks() and that
function failed the first radeon_uvd_send_upll_ctlreq() call with result -110.

Full dmesg attached.

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