drm/i915: Print the pipe on which the vblank wait times out
Improve the debug message that tells us we've been waiting for a vblank that never arrived. Printing the pipe could lead a "doh!" moment where we've been waiting for a vblank on a pipe that was off for instance. Signed-off-by: NDamien Lespiau <damien.lespiau@intel.com> Reviewed-by: NThomas Wood <thomas.wood@intel.com> [danvet: Polish commit message a bit.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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