drm: Add support for tiny LCD displays
This is an attempt at providing a DRM version of drivers/staging/fbtft.
The tinydrm library provides a very simplified view of DRM in particular for tiny displays that has onboard video memory and is connected through a slow bus like SPI/I2C.
The main change this time is adding 'rotation' as a common display Device Tree property.
Noralf.
Changes since version 2: - Remove fbdev after drm unregister, not before. - Added Documentation/devicetree/bindings/display/display.txt
Changes since version 1: - Add tinydrm.rst - Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that). - Remove some DRM_DEBUG*() - Write-combined memory has uncached reads, so speed up by copying/buffering one pixel line before conversion.
Changes since RFC v2: - Rebased on new core helpers - Don't use drm_panel - Flush when the framebuffer is changed on the plane - Add devm_tinydrm_init() - Fix PRIME support, set vaddr - Use atomic helpers in suspend/resume - Add a tinydrm_connector with one display mode - Set mode_config.preferred_depth and use it for fbdev - Subclass tinydrm_device in drivers instead of bloating the structure - The PiTFT display uses a MI0283QT panel, write driver for that instead. - Drop homegrown lcdreg module, it ended up as a collection of special cases. - Add more documentation
Changes since RFC v1: - Add fb_deferred_io support to drm_fb_helper and drm_fb_cma_helper, and use drm_fb_cma_helper instead. - Move display pipeline code to drm_simple_kms_helper. - Don't use (struct drm_driver *)->load(). - Make tinydrm more like a library, exporting the internals. - Move the struct drm_driver definition from the tinydrm module to the driver using a helper macro: TINYDRM_DRM_DRIVER. - Remove dirtyfb() async code. - Added support for partial display updates.
Noralf Trønnes (7): drm: Add DRM support for tiny LCD displays drm/tinydrm: Add helper functions drm/tinydrm: Add MIPI DBI support of: Add vendor prefix for Multi-Inno dt-bindings: display: Add common rotation property dt-bindings: Add Multi-Inno MI0283QT binding drm/tinydrm: Add support for Multi-Inno MI0283QT display
.../devicetree/bindings/display/display.txt | 4 + .../bindings/display/multi-inno,mi0283qt.txt | 27 + .../devicetree/bindings/vendor-prefixes.txt | 1 + Documentation/gpu/index.rst | 1 + Documentation/gpu/tinydrm.rst | 42 + MAINTAINERS | 6 + drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/tinydrm/Kconfig | 19 + drivers/gpu/drm/tinydrm/Makefile | 7 + drivers/gpu/drm/tinydrm/core/Makefile | 3 + drivers/gpu/drm/tinydrm/core/tinydrm-core.c | 377 ++++++++ drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 462 +++++++++ drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++ drivers/gpu/drm/tinydrm/mi0283qt.c | 279 ++++++ drivers/gpu/drm/tinydrm/mipi-dbi.c | 1005 ++++++++++++++++++++ include/drm/tinydrm/ili9341.h | 54 ++ include/drm/tinydrm/mipi-dbi.h | 107 +++ include/drm/tinydrm/tinydrm-helpers.h | 100 ++ include/drm/tinydrm/tinydrm.h | 115 +++ 20 files changed, 2846 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/display.txt create mode 100644 Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt create mode 100644 Documentation/gpu/tinydrm.rst create mode 100644 drivers/gpu/drm/tinydrm/Kconfig create mode 100644 drivers/gpu/drm/tinydrm/Makefile create mode 100644 drivers/gpu/drm/tinydrm/core/Makefile create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-core.c create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c create mode 100644 drivers/gpu/drm/tinydrm/mi0283qt.c create mode 100644 drivers/gpu/drm/tinydrm/mipi-dbi.c create mode 100644 include/drm/tinydrm/ili9341.h create mode 100644 include/drm/tinydrm/mipi-dbi.h create mode 100644 include/drm/tinydrm/tinydrm-helpers.h create mode 100644 include/drm/tinydrm/tinydrm.h
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