[Bug 56139] [bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56139

--- Comment #11 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
Found what is wrong with the help of a few printk and by comparing to the code
being replaced. All the logic is good (going through crtc, disabling them,
waiting for vblank) BUT setting "tmp |=
EVERGREEN_CRTC_DISP_READ_REQUEST_DISABLE;" is wrong.

If I do as in the previous code by setting tmp = 0 and then continuing with:
radeon_wait_for_vblank(rdev, i);
WREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i], tmp);
everything works fine as before.

What is expected from "tmp |= EVERGREEN_CRTC_DISP_READ_REQUEST_DISABLE;"? From
what I read with printk, it is far from a 0 or a 1. Is this normal?

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