Re: [RFC v2 0/5] Common Display Framework

Hi Tomasz,

On Friday 21 December 2012 11:00:52 Tomasz Figa wrote:

On Tuesday 18 of December 2012 08:31:30 Vikas Sajjan wrote:

quoted

On 17 December 2012 20:55, Laurent Pinchart wrote:

quoted

Hi Vikas,

Sorry for the late reply. I now have more time to work on CDF, so
delays should be much shorter.

On Thursday 06 December 2012 10:51:15 Vikas Sajjan wrote:

quoted

Hi Laurent,

I was thinking of porting CDF to samsung EXYNOS 5250 platform, what
I found is that, the exynos display controller is MIPI DSI based
controller.

But if I look at CDF patches, it has only support for MIPI DBI based
Display controller.

So my question is, do we have any generic framework for MIPI DSI
based display controller? basically I wanted to know, how to go about
porting CDF for such kind of display controller.

MIPI DSI support is not available yet. The only reason for that is
that I don't have any MIPI DSI hardware to write and test the code
with :-)

The common display framework should definitely support MIPI DSI. I
think the existing MIPI DBI code could be used as a base, so the
implementation shouldn't be too high.

Yeah, i was also thinking in similar lines, below is my though for
MIPI DSI support in CDF.

o   MIPI DSI support as part of CDF framework will expose
§  mipi_dsi_register_device(mpi_device) (will be called mach-xxx-dt.c
file )
§  mipi_dsi_register_driver(mipi_driver, bus ops) (will be called from
platform specific init driver call )
·    bus ops will be
o   read data
o   write data
o   write command
§  MIPI DSI will be registered as bus_register()

When MIPI DSI probe is called, it (e.g., Exynos or OMAP MIPI DSI) will
initialize the MIPI DSI HW IP.

This probe will also parse the DT file for MIPI DSI based panel, add
the panel device (device_add() ) to kernel and register the display
entity with its control and  video ops with CDF.

I can give this a try.

I am currently in progress of reworking Exynos MIPI DSIM code and s6e8ax0
LCD driver to use the v2 RFC of Common Display Framework. I have most of
the work done, I have just to solve several remaining problems.

Do you already have code that you can publish ? I'm particularly interested 
(and I think Tomi Valkeinen would be as well) in looking at the DSI operations 
you expose to DSI sinks (panels, transceivers, ...).

-- 
Regards,

Laurent Pinchart