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[00/10] drm: Improve fbdev emulation for DMA-able framebuffers

Message ID 20230704160133.20261-1-tzimmermann@suse.de
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Series drm: Improve fbdev emulation for DMA-able framebuffers | expand

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Thomas Zimmermann July 4, 2023, 3:49 p.m. UTC 
Add fbdev helpers for framebuffers in DMA-able memory and update
fbdev emulation in the respective DRM drivers. DMA memory used to
handled as system memory. Improve this and prepare for possible
future changes.

Patch 1 adds initializer macros for struct fb_ops and a Kconfig
token for framebuffers in DMA memory.

Patches 2 to 4 update fbdev-dma and tegra. No functional changes
are expected as both used system memory before.

Patches 5 and 6 update exynos to use DMA helpers. Exynos incorrectly
used fbdev's I/O-memory helpers. Fix this.

Patches 7 to 9 update omapdrm to use DMA helpers. Patch 7 first
reworks the driver's mmap to current best practices. This also makes
it suitable for use with fbdev, which patches 8 and 9 implement.

Patch 10 removes some fbdev macros for system memory that are now
unused.

The patchset would ideally go through drm-misc-next. Future patches
can build upon it and update fbdev drivers in similar ways.

Thomas Zimmermann (10):
  fbdev: Add fb_ops init macros for framebuffers in DMA-able memory
  drm/fbdev-dma: Use fbdev DMA helpers
  drm/tegra: Use fbdev DMA helpers
  drm/tegra: Set fbdev flags
  drm/exynos: Use fbdev DMA helpers
  drm/exynos: Set fbdev flags
  drm/omapdrm: Set VM flags in GEM-object mmap function
  drm/omapdrm: Use GEM mmap for fbdev emulation
  drm/omapdrm: Set fbdev flags
  fbdev: Remove FB_DEFAULT_SYS_OPS

 drivers/gpu/drm/Kconfig                   |  2 +-
 drivers/gpu/drm/drm_fbdev_dma.c           |  4 ++--
 drivers/gpu/drm/exynos/Kconfig            |  2 +-
 drivers/gpu/drm/exynos/exynos_drm_fbdev.c |  6 ++++--
 drivers/gpu/drm/omapdrm/Kconfig           |  2 +-
 drivers/gpu/drm/omapdrm/omap_drv.c        | 12 +-----------
 drivers/gpu/drm/omapdrm/omap_fbdev.c      | 17 ++++++++++++++--
 drivers/gpu/drm/omapdrm/omap_gem.c        | 24 ++++++-----------------
 drivers/gpu/drm/omapdrm/omap_gem.h        |  3 ---
 drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c |  7 +------
 drivers/gpu/drm/tegra/Kconfig             |  2 +-
 drivers/gpu/drm/tegra/fbdev.c             |  7 +++++--
 drivers/video/fbdev/Kconfig               |  8 ++++++++
 include/linux/fb.h                        | 17 ++++++++++------
 14 files changed, 57 insertions(+), 56 deletions(-)