drm/i915: W/A for underruns with WM1+ disabled on icl

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Disabling WM1+ on ICL causes tons of underruns with
linear/X-tiled framebuffers. We can avoid this by flipping
on a chicken bit affecting the way the hw fill the FIFO.
This may not be the final solution but should hopefully
avoid some underruns in the meantime.

v2: Apparently PIPE_CHICKEN is icl+ only

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190204202232.27153-1-ville.syrjala@linux.intel.com
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

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Ville Syrjälä 2019-02-04 22:22:32 +02:00

parent 108d14bdae

commit bf002c1007

2 changed files with 7 additions and 0 deletions

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1

drivers/gpu/drm/i915/i915_reg.h

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6

drivers/gpu/drm/i915/intel_display.c

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