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| /openbmc/linux/drivers/gpu/drm/i915/ |
| H A D | i915_irq.c | diff 7ce4d1f2730f2bd4320425dd376913c4a12bd3b2 Wed Apr 13 13:19:49 CDT 2016 Ville Syrjälä <ville.syrjala@linux.intel.com> drm/i915: Clear VLV_IIR after PIPESTAT
On VLV/CHV VLV_IIR is not double double buffered, and it doesn't detect
edges from PIPESTAT & co. like it does on gen4. Instead it just
directly latches the level from PIPESTAT & co. That means we must clear
VLV_IIR after PIPESTAT & co. or else we'll get a spurious bit in VLV_IIR
every single time.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460571598-24452-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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