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

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Message-ID: <8737t10wj9.fsf@intel.com>
Date:	Wed, 10 Feb 2016 11:00:58 +0200
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Nick Bowler <nbowler@...conx.ca>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel\@lists.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: PROBLEM: Intel HDMI output busticated on 4.4 (regression)

On Tue, 09 Feb 2016, Nick Bowler <nbowler@...conx.ca> wrote:
> On 2/9/16, Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:
>> 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)
>
> Well, I applied this on 4.5-rc3 and it seems to fix things.

Ville, please do a proper patch, using your best judgement on elk
vs. ctg difference.

BR,
Jani.

>
> Thanks,
>   Nick
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Jani Nikula, Intel Open Source Technology Center

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