drm/i915: avoid the last 8mb of stolen on BDW/SKL

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The FBC hardware for these platforms doesn't have access to the
bios_reserved range, so it always assumes the maximum (8mb) is used.
So avoid this range while allocating.

This solves a bunch of FIFO underruns that happen if you end up
putting the CFB in that memory range. On my machine, with 32mb of
stolen, I need a 2560x1440 mode for that.

Testcase: igt/kms_frontbuffer_tracking/fbc-* (given the right setup)
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Paulo Zanoni 2015-09-14 15:19:57 -03:00 • committed by Daniel Vetter

parent adf70c65cf

commit a9da512b3e

4 changed files with 38 additions and 9 deletions

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4

drivers/gpu/drm/i915/i915_drv.h

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1

drivers/gpu/drm/i915/i915_gem_gtt.h

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26

drivers/gpu/drm/i915/i915_gem_stolen.c

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16

drivers/gpu/drm/i915/intel_fbc.c

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