drm/i915: Restore memory mapping for DPT FBs across system suspend/resume

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At least during hibernation the DPT mappings are lost with all stolen
memory content, so suspend/resume these mappings similarly to GGTT
mappings.

This fixes a problem where the restoring modeset during system resume fails
with pipe faults if a tiled framebuffer was active before suspend.

v2: Clarify the way restore works in intel_dpt_resume()'s Docbook entry.
    (Chris)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Vunny Sodhi <vunny.sodhi@intel.com>
Reported-and-tested-by: Vunny Sodhi <vunny.sodhi@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211101183551.3580546-2-imre.deak@intel.com

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Imre Deak 2021-11-01 20:35:51 +02:00

parent 8d2f683f1c

commit 9755f055f5

3 changed files with 61 additions and 0 deletions

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52

drivers/gpu/drm/i915/display/intel_dpt.c

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4

drivers/gpu/drm/i915/display/intel_dpt.h

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5

drivers/gpu/drm/i915/i915_drv.c

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