drm: tinydrm driver for adafruit PiTFT 3.5" touchscreen

Submitted by Noralf Trønnes on Oct. 24, 2018, 6:43 p.m.

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Reviewer None
Submitted Oct. 24, 2018, 6:43 p.m.
Last Updated Oct. 26, 2018, 7:16 p.m.
Revision 1

Cover Letter

I was going to start working on making the vc4 driver work with
tinydrm panels, but it turned out tinydrm didn't have the panel I had
previously bought.  So, last night I ported the fbtft staging
driver over to DRM.

It seems to work (with DT at
https://github.com/anholt/linux/commits/drm-misc-next-hx8357d) --
fbdev works great including rotated, and so does modetest.  However,
when X11 comes up at 16bpp, I get:

https://photos.app.goo.gl/8tuhzPFFoDGamEfk8

If I have tinydrm set a preferred bpp of 24, X looks great.  Noralf,
any ideas?

Eric Anholt (3):
  dt-bindings: new binding for Himax HX8357D display panels
  drm: Add an hx8367d tinydrm driver.
  drm/tinydrm: Fix setting of the column/page end addresses.

 .../bindings/display/himax,hx8357d.txt        |  25 ++
 drivers/gpu/drm/tinydrm/Kconfig               |  11 +
 drivers/gpu/drm/tinydrm/Makefile              |   1 +
 drivers/gpu/drm/tinydrm/hx8357d.c             | 262 ++++++++++++++++++
 drivers/gpu/drm/tinydrm/hx8357d.h             |  71 +++++
 drivers/gpu/drm/tinydrm/mipi-dbi.c            |   4 +-
 6 files changed, 372 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/himax,hx8357d.txt
 create mode 100644 drivers/gpu/drm/tinydrm/hx8357d.c
 create mode 100644 drivers/gpu/drm/tinydrm/hx8357d.h
  

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