drm/i915: Enable PCH FIFO underruns later on ILK/SNB/IVB
authorVille Syrjälä <ville.syrjala@linux.intel.com>
Fri, 30 Oct 2015 17:20:27 +0000 (19:20 +0200)
committerVille Syrjälä <ville.syrjala@linux.intel.com>
Tue, 10 Nov 2015 14:22:59 +0000 (16:22 +0200)
commit37ca8d4ccd9860df0747aa2ea281a3c9c4bf8826
tree7987327910f443e610df589dd33f1a2437e6c6dd
parent9c4edaeea08896dbcc3925810963ec8ddd1ccfc4
drm/i915: Enable PCH FIFO underruns later on ILK/SNB/IVB

We get spurious PCH FIFO underruns if we enable the reporting too soon
after enabling the crtc. Move it to be the last step, after the encoder
enable. Additionally we need an extra vblank wait, otherwise we still
get the underruns. Presumably the pipe/fdi isn't yet fully up and running
otherwise.

For symmetry, disable the PCH underrun reporting as the first thing,
just before encoder disable, when shutting down the crtc.

v2: Do the PCH underrun enable unconditionally (Jani, Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v1)
Link: http://patchwork.freedesktop.org/patch/msgid/1446225627-10809-1-git-send-email-ville.syrjala@linux.intel.com
drivers/gpu/drm/i915/intel_display.c