Hi Vikas, On Tuesday 18 December 2012 08:31:30 Vikas Sajjan wrote: > On 17 December 2012 20:55, Laurent Pinchart 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. After discussing the DBI/DSI busses with Tomi Valkeinen we concluded that creating a real bus for DBI and DSI, although possible, wasn't required. DSI operations should thus be provided through display entity video source operations. You can find a proposed implementation in Tomi's patch set. > > I can give this a try. Does the existing Exynos 5250 driver support MIPI > > DSI ? Is the device documentation publicly available ? Can you point me to > > a MIPI DSI panel with public documentation (preferably with an existing > > mainline driver if possible) ? > > yeah, existing Exynos 5250 driver support MIPI DSI ass well as eDP. > > i think device documentation is NOT available publicly. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
