[PATCH 0/9] drm: Add support for tiny LCD displays

From: Noralf TrÃnnes
Date: Sun Jan 22 2017 - 13:12:08 EST


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.

Main changes since the RFCv2 in April last year:
- No tinydrm specific callbacks (dirtyfb+drm_panel_funcs), instead use
drm_simple_display_pipe_funcs and drm_framebuffer_funcs directly in
drivers and controller libraries.
- Drop lcdreg abstraction. MIPI DCS isn't really about registers, but
rather commands with optional parameters. regmap is probably a good
fit for the other more register oriented controllers.

I will cut back on some of the DRM_DEBUG*() usage when the api has settled.


Noralf.


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 TrÃnnes (9):
drm/fb-cma-helper: Add drm_fbdev_cma_set_suspend_unlocked()
drm: debugfs: Remove all files automatically on cleanup
drm/simple-helpers: Add missing includes
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: Add Multi-Inno MI0283QT binding
drm/tinydrm: Add support for Multi-Inno MI0283QT display

.../bindings/display/multi-inno,mi0283qt.txt | 27 +
.../devicetree/bindings/vendor-prefixes.txt | 1 +
Documentation/gpu/drm-kms-helpers.rst | 33 +
MAINTAINERS | 13 +
drivers/gpu/drm/Kconfig | 2 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_debugfs.c | 17 +-
drivers/gpu/drm/drm_fb_cma_helper.c | 18 +
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 | 374 ++++++++
drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 490 ++++++++++
drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 244 +++++
drivers/gpu/drm/tinydrm/mi0283qt.c | 279 ++++++
drivers/gpu/drm/tinydrm/mipi-dbi.c | 1005 ++++++++++++++++++++
include/drm/drm_fb_cma_helper.h | 2 +
include/drm/drm_simple_kms_helper.h | 4 +
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 +++
22 files changed, 2913 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
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