linux-kernel - Re: Wavering Arrandale output

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Date:	Sat, 14 May 2011 08:55:15 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	"Gustavo F. Padovan" <padovan@...fusion.mobi>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: Wavering Arrandale output

On Fri, 13 May 2011 17:45:11 -0300, "Gustavo F. Padovan" <padovan@...fusion.mobi> wrote:
> Hi Chris,
> 
> Bug #28306 is going to complete his first birthday at the end of this month,
> it is nagging around for a long time and I have many interest in fix this.
> 
> So I tested your patch in duplicated bug #36599 and it doesn't work, but I
> managed to add some printks(see diff) there to help debug.
> 
> [    1.033866] [drm:intel_crtc_mode_set] *ERROR* 1. use_ssc 1
> [    1.033868] [drm:intel_crtc_mode_set] *ERROR* encoder->type 4
> [    1.033869] [drm:intel_crtc_mode_set] *ERROR* 2. use_ssc 1
> [    1.034120] [drm:intel_crtc_mode_set] *ERROR* is_lvds 1
> [    1.034121] [drm:intel_crtc_mode_set] *ERROR* has_edp_encoder
> (null)
> [    1.191465] [drm:intel_crtc_mode_set] *ERROR* 1. use_ssc 1
> [    1.191466] [drm:intel_crtc_mode_set] *ERROR* encoder->type 4
> [    1.191468] [drm:intel_crtc_mode_set] *ERROR* encoder->type 1
> [    1.191469] [drm:intel_crtc_mode_set] *ERROR* 2. use_ssc 0
> [    1.191720] [drm:intel_crtc_mode_set] *ERROR* is_lvds 0
> [    1.191721] [drm:intel_crtc_mode_set] *ERROR* has_edp_encoder
> (null)
> 
> It seems your patch has no effect once has_edp_encoder is null. Can you please
> look into this? I can provide any test you may want, just send me the patches.
> ;)

With no eDP on the system, we wouldn't expect to apply any of the eDP
settings.

Even after your fix to the patch, nothing? Can you try just setting
use_ssc=0 (and keep your fix).

In 633f2ea26665d37bb3c8ae30799aa14988622653 (drm/i915: Disable SSC for
outputs other than LVDS or DP) I tried to implement another aspect of
source-clock control, that is the patch that appeared to work if you only
had VGA connected. So the next step would be to combine the two patches.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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