[Intel-gfx] [PATCH] drm/i915: Fix DPLL warning when starting guest VM

[Zhenyu Wang]

On 2017.10.31 03:09:04 +0000, Zhao, Xinda wrote:
> > 
> > On Mon, Oct 30, 2017 at 03:49:28PM +0200, Ville Syrjälä wrote:
> > > On Mon, Oct 30, 2017 at 04:17:06PM +0800, Zhao, Xinda wrote:
> > > > The warning is occurred in guest VM when trying to get clock in
> > > > encoder initialization.
> > 
> > What does guest VM mean here? gvt? If so, why do you claim to have an
> > enabled port without an enabled pipe?
> 
> [xinda] 
> Yes, gvt-g. 
> 
> We emulate a DP device on port B that is fixed to pipe A for each guest VM by setting following register, it is mandatory.
> TRANS_DDI_FUNC_CTL(TRANSCODER_A)) |= (PORT_B << TRANS_DDI_PORT_SHIFT);
> 
> We don't emulate the status of pipe, whether it is enabled or not, it depends on the i915 setting in guest VM, it is optional.
> The PIPECONF register will be trapped, but the behavior will not be emulated.
>

Looks that's wrong behavior which means full virtualized display brokenness
that still depends on some real hw status?

-- 
Open Source Technology Center, Intel ltd.

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