[PATCH v2 0/4] drm/hibmc: Fix plane helpers and convert to gem-shmem

[Thomas Zimmermann <tzimmermann@suse.de>]

Convert hibmc's memory management from gem-vram ot gem-shmem. Fix a
number of bugs in preparation.

Patches 1 to 3 fix various bugs in the plane code.

Patch 4 replaces gem-vram with gem-shmem. The rational is that gem-vram
has corner cases on low-end devices and is limited in functionality. The
commit messages state a list of possible issues.

Switching to gem-shmem avoids these problems. It also enables buffer
sharing with dma_buf, which improves the hibmc driver's integration with
the overall graphics ecosystem.

We've done these changes on drivers for similar hardware, such as ast and
mgag200. Hibmc is the last of these drivers to not run gem-shmem. Gem-vram
instead is deprecated and hopefully can be removed in a later release.

Tested on an RH1288 v3 system.

v2:
- extend commit message of patch 2 (Yongbang)
- so not select TTM any longer

Thomas Zimmermann (4):
  drm/hibmc: Use drm_atomic_helper_check_plane_state()
  drm/hibmc: Fix list of formats on the primary plane
  drm/hibmc: Do not use cpp from struct drm_format_info
  drm/hibmc: Use gem-shmem with shadow-plane helpers for memory
    management

 drivers/gpu/drm/drm_gem_shmem_helper.c        |  17 ++-
 drivers/gpu/drm/hisilicon/hibmc/Kconfig       |   4 +-
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_de.c    | 110 +++++++++---------
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c   |  62 +++++++---
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h   |   5 +
 include/drm/drm_gem_shmem_helper.h            |   5 +
 6 files changed, 128 insertions(+), 75 deletions(-)

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2.53.0