drm/i915/dp: Be paranoid in case we disable a DP before it is attached
Given that the hardware may be left in a random condition by the BIOS, it is conceivable that we then attempt to clear the DP_PIPEB_SELECT bit without us ever enabling/attaching the DP encoder to a pipe. Thus causing a NULL deference when we attempt to wait for a vblank on that crtc. Reported-and-tested-by: NBryan Christ <bryan.christ@gmail.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36314Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36456Reported-and-tested-by: NBo Wang <bo.b.wang@intel.com> Cc: stable@kernel.org Signed-off-by: NKeith Packard <keithp@keithp.com>
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