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Date: Tue, 9 Feb 2016 13:02:16 -0500
Message-ID: <CADyTPEzA7MKvXCH5iLuD_abAQnkwAQ0EDt9e_hQGD26Qf6uN7g@mail.gmail.com>
Subject: Re: PROBLEM: Intel HDMI output busticated on 4.4 (regression)
From: Nick Bowler <nbowler@draconx.ca>
To: =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>
Cc: "Sharma, Shashank" <shashank.sharma@intel.com>,
        "Jindal, Sonika" <sonika.jindal@intel.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
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On 2/9/16, Ville Syrjälä <ville.syrjala@linux.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.

Thanks,
  Nick