[Bug 63935] TURKS [drm:r600_uvd_init] *ERROR* UVD not responding, trying to reset the VCPU!!!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63935

--- Comment #20 from Benjamin Lee <ben at b1c1l1.com> ---
I am using a monolithic kernel without initrd (CONFIG_DRM_RADEON=y and
CONFIG_EXTRA_FIRMWARE) using the exact same vmlinuz file between EFI and BIOS
modes, so I don't believe I have a ucode issue since BIOS mode works correctly.

RADEON_AUX_SC_CNTL is different between EFI and BIOS emulation:

blee at supra ~/tmp $ diff bios.regs efi.regs
8c8
< RADEON_AUX_SC_CNTL    52f7377c
---
> RADEON_AUX_SC_CNTL    52f7337c
46,48c46,48
< RADEON_CRTC2_H_TOTAL_DISP     0200000f
< RADEON_CRTC2_H_SYNC_STRT_WID  00000000
< RADEON_CRTC2_V_TOTAL_DISP     00000100
---
> RADEON_CRTC2_H_TOTAL_DISP     0000000f
> RADEON_CRTC2_H_SYNC_STRT_WID  00003f3f
> RADEON_CRTC2_V_TOTAL_DISP     00000000

I built a separate kernel for fglrx and found that RADEON_AUX_SC_CNTL matched
the BIOS emulation mode:

blee at supra ~/tmp $ diff fglrx.regs bios.regs
46c46
< RADEON_CRTC2_H_TOTAL_DISP     0203000f
---
> RADEON_CRTC2_H_TOTAL_DISP     0200000f

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