[Intel-gfx] [PATCH] drm/i915: Set edid from init and not from detect

[Daniel Vetter]

On Mon, Jul 13, 2015 at 05:29:12PM +0530, Jindal, Sonika wrote:
> 
> 
> On 7/13/2015 5:10 PM, Chris Wilson wrote:
> >On Mon, Jul 13, 2015 at 04:19:15PM +0530, Sonika Jindal wrote:
> >>During init_connector set the edid, then edid will be set/unset only during
> >>hotplug. For the sake of older platforms where HPD is not stable, let edid
> >>read happen from detect as well only if it is forced to do so.
> >>
> >>v2: Removing the 'force' check, instead let detect call read the edid for
> >>platforms older than gen 7 (Shashank)
> >
> >That's enough worse. We now have a random gen check with no rationale
> >for why you suddenly believe all manufacturers have fixed their wiring.
> >There is no reason to believe that gen7 suddenly works is there? If
> >there is, why don't you mention it?
> >-Chris
> >
> This gen7 check is to be on the safer side not to affect older paltforms.
> For CHV/VLV, already the live status check is stable enough to determine if
> we can read edid or not. In VPG production branches we have this patch
> already available and it was tested with variety of monitors extensively. So
> we now read the edid only during init and during hotplug.
> For SKL, the "[PATCH] drm/i915: Handle HPD when it has actually occurred"
> patch makes HPD stable enough.
> So, we can rely on the edid read from init_connector instead of reading edid
> on every detect call.

Again, not going to take this with random gen checks. I want your fix for
handling hpd on other platforms, then roll this out everywhere.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch