[RFC v2 0/8] drm: Add support for tiny LCD displays

[Daniel Vetter]

On Fri, Apr 08, 2016 at 07:05:02PM +0200, Noralf Trønnes wrote:
> This is an attempt at providing a DRM version of drivers/staging/fbtft.
> 
> I'm sending this early before cleaning up the code hoping to get some
> feedback in case there are better ways to structure this.
> 
> The tinydrm module provides a very simplified view of DRM for displays that
> has onboard video memory and is connected through a slow bus like SPI/I2C.
> A driver using tinydrm has to provide a function that will be called from
> the dirtyfb ioctl (or fbdev deferred io) and optional drm_panel functions
> which can be used to set up the display controller and control backlight.
> 
> Display controllers that have a similar register interface as the MIPI DBI/DCS
> controllers can use the lcdreg module for register access.

I like this a lot. For the panel stuff itself I think it'd be good to have
comments from Thierry Redding too. Otherwise I'd say let's polish the def
io and simple kms stuff and start get that merged meanwhile.
-Daniel

> 
> 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 (8):
>   drm/fb-helper: Add fb_deferred_io support
>   drm/fb-cma-helper: Add fb_deferred_io support
>   drm: Add helper for simple kms drivers
>   drm: Add DRM support for tiny LCD displays
>   drm/tinydrm: Add lcd register abstraction
>   drm/tinydrm/lcdreg: Add SPI support
>   drm/tinydrm: Add mipi-dbi support
>   drm/tinydrm: Add support for several Adafruit TFT displays
> 
>  drivers/gpu/drm/Kconfig                            |   9 +
>  drivers/gpu/drm/Makefile                           |   2 +
>  drivers/gpu/drm/drm_fb_cma_helper.c                | 149 ++++-
>  drivers/gpu/drm/drm_fb_helper.c                    | 189 +++++-
>  drivers/gpu/drm/drm_simple_kms_helper.c            | 262 ++++++++
>  drivers/gpu/drm/tinydrm/Kconfig                    |  25 +
>  drivers/gpu/drm/tinydrm/Makefile                   |   8 +
>  drivers/gpu/drm/tinydrm/adafruit-tft.c             | 257 ++++++++
>  drivers/gpu/drm/tinydrm/core/Makefile              |   6 +
>  drivers/gpu/drm/tinydrm/core/tinydrm-core.c        | 155 +++++
>  .../gpu/drm/tinydrm/core/tinydrm-display-pipe.c    |  82 +++
>  drivers/gpu/drm/tinydrm/core/tinydrm-fbdev.c       |  94 +++
>  drivers/gpu/drm/tinydrm/core/tinydrm-framebuffer.c |  99 +++
>  drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c     |  95 +++
>  drivers/gpu/drm/tinydrm/lcdreg/Kconfig             |   8 +
>  drivers/gpu/drm/tinydrm/lcdreg/Makefile            |   5 +
>  drivers/gpu/drm/tinydrm/lcdreg/internal.h          |   8 +
>  drivers/gpu/drm/tinydrm/lcdreg/lcdreg-core.c       | 190 ++++++
>  drivers/gpu/drm/tinydrm/lcdreg/lcdreg-debugfs.c    | 281 ++++++++
>  drivers/gpu/drm/tinydrm/lcdreg/lcdreg-spi.c        | 720 +++++++++++++++++++++
>  drivers/gpu/drm/tinydrm/mipi-dbi.c                 | 253 ++++++++
>  include/drm/drm_fb_cma_helper.h                    |  14 +
>  include/drm/drm_fb_helper.h                        |  15 +
>  include/drm/drm_simple_kms_helper.h                |  44 ++
>  include/drm/tinydrm/ili9340.h                      |  47 ++
>  include/drm/tinydrm/lcdreg-spi.h                   |  63 ++
>  include/drm/tinydrm/lcdreg.h                       | 126 ++++
>  include/drm/tinydrm/mipi-dbi.h                     |  24 +
>  include/drm/tinydrm/tinydrm.h                      | 143 ++++
>  29 files changed, 3360 insertions(+), 13 deletions(-)
>  create mode 100644 drivers/gpu/drm/drm_simple_kms_helper.c
>  create mode 100644 drivers/gpu/drm/tinydrm/Kconfig
>  create mode 100644 drivers/gpu/drm/tinydrm/Makefile
>  create mode 100644 drivers/gpu/drm/tinydrm/adafruit-tft.c
>  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-display-pipe.c
>  create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-fbdev.c
>  create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-framebuffer.c
>  create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
>  create mode 100644 drivers/gpu/drm/tinydrm/lcdreg/Kconfig
>  create mode 100644 drivers/gpu/drm/tinydrm/lcdreg/Makefile
>  create mode 100644 drivers/gpu/drm/tinydrm/lcdreg/internal.h
>  create mode 100644 drivers/gpu/drm/tinydrm/lcdreg/lcdreg-core.c
>  create mode 100644 drivers/gpu/drm/tinydrm/lcdreg/lcdreg-debugfs.c
>  create mode 100644 drivers/gpu/drm/tinydrm/lcdreg/lcdreg-spi.c
>  create mode 100644 drivers/gpu/drm/tinydrm/mipi-dbi.c
>  create mode 100644 include/drm/drm_simple_kms_helper.h
>  create mode 100644 include/drm/tinydrm/ili9340.h
>  create mode 100644 include/drm/tinydrm/lcdreg-spi.h
>  create mode 100644 include/drm/tinydrm/lcdreg.h
>  create mode 100644 include/drm/tinydrm/mipi-dbi.h
>  create mode 100644 include/drm/tinydrm/tinydrm.h
> 
> --
> 2.2.2
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch