Re: PROBLEM: Intel HDMI output busticated on 4.4 (regression)

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Feb 09, 2016 at 07:36:41PM +0200, Ville Syrjälä wrote:
> On Tue, Feb 09, 2016 at 07:03:51PM +0200, Ville Syrjälä wrote:
> > On Tue, Feb 09, 2016 at 04:39:21PM +0000, Sharma, Shashank wrote:
> > > Hi Nick, 
> > > 
> > > Sonika is OOO for this week. 
> > > AFAIK about this issue, looks like the live status is not getting set for your system, on HPD. 
> > > 
> > > As per the Bspec, we must check live status before trying to read EDID. 
> > > Is it possible for you to check with an HDMI analyzer and probe live status register ?
> > 
> > BTW I'm not at all convinced about the current live status bit defines
> > we have for g4x. Supposedly someone tested them and found that they
> > don't match the spec, but IIRC when I tried them on one g4x machine
> > here, they did match the spec (well, at least for the ports present
> > on that particular board).
> > 
> > So something like this may or may not help:
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 188ad5de020f..80c08016e522 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -3302,9 +3302,9 @@ enum skl_disp_power_wells {
> >   * Please check the detailed lore in the commit message for for experimental
> >   * evidence.
> >   */
> > -#define   PORTD_HOTPLUG_LIVE_STATUS_G4X		(1 << 29)
> > +#define   PORTD_HOTPLUG_LIVE_STATUS_G4X		(1 << 27)
> >  #define   PORTC_HOTPLUG_LIVE_STATUS_G4X		(1 << 28)
> > -#define   PORTB_HOTPLUG_LIVE_STATUS_G4X		(1 << 27)
> > +#define   PORTB_HOTPLUG_LIVE_STATUS_G4X		(1 << 29)
> >  /* VLV DP/HDMI bits again match Bspec */
> >  #define   PORTD_HOTPLUG_LIVE_STATUS_VLV		(1 << 27)
> >  #define   PORTC_HOTPLUG_LIVE_STATUS_VLV		(1 << 28)
> 
> Just retested the g4x machine here, and port B is definitely on bit 29,
> port C on bit 28. No port D on ELK, so can't check that. So either
> someone made a fumble when they tested this originally, or some boards
> are just wired incorrectly, or CTG is where it was tested and that
> actually disagrees with the spec for some reason.

I just tried to trawl the w/a database for anything interesting, and the
only thing I ran across was WaDPHDMISupriousHpd (without any description
of course) for both elk and ctg. Nothing else really relevant looking.

So I think we should get someone to double check this on ctg, and then
we can decide whether we change the bits just for elk or for ctg as well.

> 
> > -- 
> > 2.4.10
> > 
> > 
> > > 
> > > Regards
> > > Shashank
> > > -----Original Message-----
> > > From: Nick Bowler [mailto:nbowler@draconx.ca] 
> > > Sent: Tuesday, February 09, 2016 10:03 PM
> > > To: Jindal, Sonika
> > > Cc: linux-kernel@vger.kernel.org; dri-devel@lists.freedesktop.org; Daniel Vetter; Sharma, Shashank
> > > Subject: Re: PROBLEM: Intel HDMI output busticated on 4.4 (regression)
> > > 
> > > On 1/28/16, Nick Bowler <nbowler@draconx.ca> wrote:
> > > > On 2016-01-21, Nick Bowler <nbowler@draconx.ca> wrote:
> > > >> On 2016-01-21, Jindal, Sonika <sonika.jindal@intel.com> wrote:
> > > >>> On 1/21/2016 8:59 AM, Nick Bowler wrote:
> > > >>>> On 1/20/16, Nick Bowler <nbowler@draconx.ca> wrote:
> > > >>>>> On 2016-01-20, Jindal, Sonika <sonika.jindal@intel.com> wrote:
> > > >> [...]
> > > >>>>>> Does the same system works with any other monitor?
> > > >>>>> I'll see if I can find another to try.
> > > >>>> I tried another monitor, and the same problem occurs.
> > > >>> Which make are these monitors?
> > > >>
> > > >>  - LG Flatron W2253V
> > > >>  - Dell E228WFPc
> > > >>
> > > >>> Do you have any other system other than G45?
> > > >>
> > > >> Nothing else with Linux 4.4, unfortunately.
> > > >
> > > > Anything else you want me to try?
> > > >
> > > > This issue is still present in 4.5-rc1.
> > > 
> > > Ping?
> > > 
> > > HDMI is still broken on my system in 4.5-rc3.
> > > 
> > > Cheers,
> > >   Nick
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > 
> > -- 
> > Ville Syrjälä
> > Intel OTC
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Ville Syrjälä
> Intel OTC
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-- 
Ville Syrjälä
Intel OTC