[RFC,0/6] drm: EPDC driver for i.MX6

Message

Andreas Kemnade Feb. 6, 2022, 8 a.m. UTC

Add a driver for the Electrophoretic Display Controller found in the
i.MX6 SoCs.

In combination with a driver for an EPD PMIC (like the TPS65185 or the
SY7636A), it works with the EPDC found in i.MX6SLL based devices and the
EPDC found in i.MX6SL devices.

Support for waveforms might be limited, there was no 4bit waveform found
which works with the 6SLL but it works with the vendor waveforms of the
Kobo Clara HD (6SLL), the Tolino Shine 2/3 (6SL).
On the 6SL devices, also the epdc_E060SCM.fw works but not as brilliant
as the vendor one.

It does not involve the PXP yet. The NXP/Freescale kernel fork uses that
for rotation and mysterious waveform handling. That is not planed to be
upstreamed in the first step.

Also it does not provide any special userspace API to fine-tune updates.
That is also IMHO something for a second step.

Andreas Kemnade (6):
  dt-bindings: display: imx: Add EPDC
  drm: Add skeleton for EPDC driver
  drm: mxc-epdc: Add display and waveform initialisation
  drm: mxc-epdc: Add update management
  ARM: dts: imx6sll: add EPDC
  arm: dts: imx6sl: Add EPDC

 .../bindings/display/imx/fsl,mxc-epdc.yaml    |  159 +++
 arch/arm/boot/dts/imx6sl.dtsi                 |    3 +
 arch/arm/boot/dts/imx6sll.dtsi                |    9 +
 drivers/gpu/drm/Kconfig                       |    2 +
 drivers/gpu/drm/Makefile                      |    1 +
 drivers/gpu/drm/mxc-epdc/Kconfig              |   15 +
 drivers/gpu/drm/mxc-epdc/Makefile             |    5 +
 drivers/gpu/drm/mxc-epdc/epdc_hw.c            |  497 +++++++
 drivers/gpu/drm/mxc-epdc/epdc_hw.h            |    8 +
 drivers/gpu/drm/mxc-epdc/epdc_regs.h          |  442 ++++++
 drivers/gpu/drm/mxc-epdc/epdc_update.c        | 1210 +++++++++++++++++
 drivers/gpu/drm/mxc-epdc/epdc_update.h        |    9 +
 drivers/gpu/drm/mxc-epdc/epdc_waveform.c      |  189 +++
 drivers/gpu/drm/mxc-epdc/epdc_waveform.h      |    7 +
 drivers/gpu/drm/mxc-epdc/mxc_epdc.h           |  151 ++
 drivers/gpu/drm/mxc-epdc/mxc_epdc_drv.c       |  373 +++++
 16 files changed, 3080 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,mxc-epdc.yaml
 create mode 100644 drivers/gpu/drm/mxc-epdc/Kconfig
 create mode 100644 drivers/gpu/drm/mxc-epdc/Makefile
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_hw.c
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_hw.h
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_regs.h
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_update.c
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_update.h
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_waveform.c
 create mode 100644 drivers/gpu/drm/mxc-epdc/epdc_waveform.h
 create mode 100644 drivers/gpu/drm/mxc-epdc/mxc_epdc.h
 create mode 100644 drivers/gpu/drm/mxc-epdc/mxc_epdc_drv.c