[PATCH v3 0/8] panfrost: Locking and runtime PM fixes

[Rob Herring]

With further testing of recent changes with lockdep identified some
locking issues. Avoiding lockdep issues means we need to avoid some
locks in panfrost_mmu_unmap which in turn means avoiding runtime PM
resume. In the process of re-working runtime PM several runtime PM
and locking clean-ups have been identified.

v3:
 - Applied patches 1, 4, 5, and 6
 - Fix race in job timeout handling with ISR
 - Remove some no longer needed locks
 - Fix panfrost_mmu_unmap when autosuspend delay is > 0
 - Disable AS MMU when freeing page tables

v2:
 - Drop already applied 'drm/panfrost: Fix sleeping while atomic in
   panfrost_gem_open'
 - Runtime PM clean-ups
 - Keep panfrost_gem_purge and use mutex_trylock there
 - Rework panfrost_mmu_unmap runtime PM

Rob

Rob Herring (8):
  drm/panfrost: Rework runtime PM initialization
  drm/panfrost: Hold runtime PM reference until jobs complete
  drm/panfrost: Remove unnecessary mmu->lock mutex
  drm/panfrost: Rework page table flushing and runtime PM interaction
  drm/panfrost: Split mmu_hw_do_operation into locked and unlocked
    version
  drm/panfrost: Add cache/TLB flush before switching address space
  drm/panfrost: Flush and disable address space when freeing page tables
  drm/panfrost: Remove unnecessary hwaccess_lock spin_lock

 drivers/gpu/drm/panfrost/panfrost_device.c | 10 ---
 drivers/gpu/drm/panfrost/panfrost_device.h |  3 -
 drivers/gpu/drm/panfrost/panfrost_drv.c    | 10 ++-
 drivers/gpu/drm/panfrost/panfrost_job.c    | 43 ++++++----
 drivers/gpu/drm/panfrost/panfrost_mmu.c    | 91 ++++++++++------------
 5 files changed, 76 insertions(+), 81 deletions(-)

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2.20.1