[Intel-gfx] [PATCH v5 2/6] drm/i915/pxp: add device link between i915 and mei_pxp

[Teres Alexis, Alan Previn]

On Mon, 2023-01-23 at 09:31 -0500, Vivi, Rodrigo wrote:
> On Sun, Jan 22, 2023 at 06:57:24AM +0000, Usyskin, Alexander wrote:
> > > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > > index d50354bfb993..bef6d7f8ac55 100644
> > > > --- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> > > > @@ -127,6 +127,10 @@ static int i915_pxp_tee_component_bind(struct
> > > 
alan:snip.

Thanks Jani, Rodrigo and Alex. I'll re-rev with all of Rodrigo's recommendation:
- will break down the initial code so we dont hide device-link behind drm_WARN_ON 
- since i didnt hear any hard objection - I will stick with Rodrigo's recommendation to stash the device-link.
- dont need DL_FLAG_PM_RUNTIME
- use -ENODEV

probably like this:

	if (!HAS_HECI_PXP(i915)) {
		pxp->component_dev_link = device_link_add(i915_kdev, tee_kdev, DL_FLAG_STATELESS);
		if (drm_WARN_ON(&i915->drm, !pxp->component_dev_link))
			return -ENODEV;
	}


alan:snip.