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

Hi Vikas,

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

 Hi Laurent,

Thanks for the reply.

On 17 December 2012 20:55, Laurent Pinchart <

laurent.pinchart@ideasonboard.com> 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

quoted

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

quoted

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

quoted

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.

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center
SW Solution Development, Linux Platform