[PATCH] radeon: Remove useless quirk for zx1/FireGL X1 combo introduced with fdo #7770

[Émeric MASCHINO]

Hi,

Several years ago, I started a thread about stability issues with hp
zx1 chipset and ATI FireGL X1 graphics adapter on ia64 platform [1].
As an attempt to minimize problems, a quirk was introduced to restrict
AGP mode to 2x [2]. This never solve the stability issues, as the real
cause was in fact incorrect settings of the selectable timer interrupt
frequency [3].

The attached patch thus removes the useless restriction on AGP mode.
Indeed, I'm running at full AGP 4x mode for several weeks now without
a problem.

The attached patch applies cleanly against 3.15-rc5.

Thanks,

     Émeric


[1] http://marc.info/?l=dri-devel&m=126494456828755&w=2
[2] http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=a7f465f73363fce409870f62173d518b1bc02ae6
[3] http://marc.info/?l=linux-ia64&m=140077543819871&w=2
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