[PATCH v4 0/7] drm: Add support for tiny LCD displays

Noralf Trønnes
2017-02-11T18:49:15Z

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.

Jani pointed out that the backlight dependency was broken, so since it's
so small and most tinydrm drivers will need it, I just selected it.

The DT rotation property has been moved to display/panel/panel.txt.

Noralf.

Changes since version 3:
- Rebase on new drm_fbdev_cma_init_with_funcs() signature
- Fix backlight dependency by selecting it
- Use #if IS_ENABLED(CONFIG_SPI) instead of #ifdef to handle tristate
- Changed display/display.txt -> display/panel/panel.txt

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/panel: Add common rotation property
dt-bindings: Add Multi-Inno MI0283QT binding
drm/tinydrm: Add support for Multi-Inno MI0283QT display

.../bindings/display/multi-inno,mi0283qt.txt | 27 +
.../devicetree/bindings/display/panel/panel.txt | 4 +
.../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 | 21 +
drivers/gpu/drm/tinydrm/Makefile | 7 +
drivers/gpu/drm/tinydrm/core/Makefile | 3 +
drivers/gpu/drm/tinydrm/core/tinydrm-core.c | 376 ++++++++
drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 460 +++++++++
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, 2845 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
create mode 100644 Documentation/devicetree/bindings/display/panel/panel.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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2.10.2