[PATCH 0/2] Add DRM panel driver for Ilitek ILI9341 based panels in parallel RGB mode

[Josef Luštický]

Hello Sam, Rob,
thank you both for comments.

I've already prepared most of the code for v2 of this patchset.

At the moment I am investigating, if it's possible to use mipi_dbi_*
functions for the display initialization,
as Rob suggested ("Can't you use existing mipi_dbi_* functions instead
of rolling your own?").

I'll post v2 patchset soon.

Kind regards
Josef

st 26. 6. 2019 v 14:57 odesílatel Sam Ravnborg <sam at ravnborg.org> napsal:
>
> Hi Josef.
>
> On Tue, Feb 19, 2019 at 02:20:59PM +0100, Josef Lusticky wrote:
> > These patches add panel driver for ili9341-based panels in parallel RGB mode.
> > The driver was developed for DispleyTech DT024CTFT LCD panel [1] which features ILI9341 chip [2].
> > The driver was tested on the Allwinner A13 (sun5i) platform.
> >
> > The driver supports 240x320 pixel resolution with 18-bit RGB (6 wires per color)
> > and SPI control bus with Data/Command GPIO pin.
> >
> > The Data/Command GPIO is optional, however at the moment the driver requires it:
> > The display itself is capable of 9-bit SPI without the Data/Command GPIO.
> > Support for such configuration can be added later to the driver.
> >
> > Optional HW reset gpio can be specified, otherwise SW reset command is used
> > during the initialization.
> >
> > The ILI9341 displays have two command sets:
> > Level 1 conforms to MIPI specs
> > Level 2 is outside the MIPI specs - custom defines are used in the driver
> >
> > The ILI9341 supports various RGB modes (e.g. NVSYNC, DE_LOW, clock freq, etc.),
> > however values that are presented in the ILI9341 datasheet [2] are used
> > by the driver in struct drm_display_mode.
> >
> >
> > General note on ILI9341-based displays:
> > The ILI9341 chip can be used in parallel RGB with SPI control
> > or in SPI only mode where the image data itself is also transferred via SPI.
> > This driver supports parallel RGB displays - it works with displays wired with 18-bit RGB input,
> > it does not support SPI data mode (i.e. Multi-inno mi0283qt or Adafruit yx240qv29 are not supported by this driver).
> > The SPI data mode is naturally much slower than the parallel RGB mode.
> >
> > General note on DisplayTech DT024CTFT panel:
> > The panel supports different configuation options (18/16/6-bit RGB or 9/8-bit SPI) depending on the IM[0:3] wiring.
> > To keep this patch small for reveiw, at the moment only 18-bit RGB mode and 8-bit SPI with Data/Command GPIO
> > is supported by this driver.
> >
> >
> > I kindly ask you for a patch review.
> Did you get around to send a v2 of this patchset?
>
>         Sam