[v2,0/3] drm/panthor: Coherency related fixes

Message

Akash Goel Oct. 30, 2024, 10:54 p.m. UTC

This patch series contains 3 cache coherency related fixes for the
Panthor driver.
- The first fix, regarding the Inner-shareability, is mandatory to
  ensure things work on all platforms (including Juno FPGA) when
  no_coherency protocol is selected.
- The second fix regarding the coherency feature/enable register is
  required to avoid potential misalignment on certain platforms.
- The third fix, regarding the potential overwrite of buffer objects,
  has been prepared speculatively & it may not be required in practice.

v2:
- Added r-b tags for the first 2 patches

Akash Goel (3):
  drm/panthor: Update memattr programing to align with GPU spec
  drm/panthor: Explicitly set the coherency mode
  drm/panthor: Prevent potential overwrite of buffer objects

 drivers/gpu/drm/panthor/panthor_device.c | 22 ++++++++++++++++++-
 drivers/gpu/drm/panthor/panthor_gem.h    | 10 +++++++++
 drivers/gpu/drm/panthor/panthor_gpu.c    |  9 ++++++++
 drivers/gpu/drm/panthor/panthor_mmu.c    | 28 +++++++++++++++++-------
 4 files changed, 60 insertions(+), 9 deletions(-)