[Intel-gfx] i915 with valleyview

[Sudip Mukherjee]

On Mon, May 09, 2016 at 11:19:16AM +0300, Jani Nikula wrote:
> On Fri, 06 May 2016, Sudip Mukherjee <sudipm.mukherjee at gmail.com> wrote:
> > On Fri, May 06, 2016 at 12:21:04PM +0100, Sudip Mukherjee wrote:
> >> Hi Daniel,
> >> I am trying to use i915 in one of our board which has Intel ATOM E3840.
> >> I know Intel has released emgd driver for this cpu to use i915 but emgd
> >> is not supported on v4.5 (or v4.6). The board is having SFI (simple
> >> firmware interface) and maybe for that i915 is not finding the VBIOS and
> >> other required information.
> >
> > I have been looking more into it and looks like it is supposed to use
> > dsi but since there is no vbt so has_mipi is never set and dsi is never
> > initialized.
> > Can you please point me to somewhere or maybe give some idea how i can
> > use i915 in a board where there is no vbt.
> 
> Hate to say it, but the i915 DSI support heavily relies on the VBT being
> present. Basically all the configuration is there. I haven't got a clue
> how emgd handles it. Maybe Matt does?

emgd has a config file where we have to specify the configuration for
it to work.

> 
> Basically you'd either have to figure out the configuration for the
> panel from somewhere and feed it to intel_dsi_panel_vbt.c, or write a
> panel specific driver of your own.

and i guess i will also need to modify intel_dsi_init() as that is also
taking some of the information from the VBT.

Thanks for the information.

regards
sudip