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

Thomas Zimmermann
2023-07-04T16:01:41Z

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(-)

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2.41.0