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

[Tomasz Figa <t.figa@samsung.com>]

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:
> > 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:
> > > 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.

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