linux-kernel - Re: [Intel-gfx] [PATCH 3/7] drm/i915: Treat PCH eDP like DP in most places

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <yunr51qwjjm.fsf@aiko.keithp.com>
Date:	Wed, 02 Nov 2011 09:55:41 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Adam Jackson <ajax@...hat.com>,
	"Wang\, Zhenyu" <zhenyuw@...ux.intel.com>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 3/7] drm/i915: Treat PCH eDP like DP in most places

On Wed, 02 Nov 2011 11:29:53 -0400, Adam Jackson <ajax@...hat.com> wrote:

> Redundant.  You've already done the link_configuration |= above in the 
> common code.  You can drop the second if chunk altogether.

Thanks for catching this mistake; cut&paste programming without the cut part...

> In related news, the corresponding section for this in TRANS_DP_CTL 
> setup appears to turn on enhanced framing unconditionally.  This is 
> probably not a big deal, I don't think I've ever seen a display not 
> support it, but.

Yeah, it's actually a huge pain because TRANS_DP_CTL is set up in
ironlake_pch_enable, which is part of the crtc enable path not the
encoder mode set path, and getting to the appropriate intel_dp structure
takes a walk through all of the encoders to find the matching one.

I think we could move the TRANS_DP_CTL code into intel_dp.c where it
belongs; this chunk was stuck inside ironlake_crtc_dpms by Zhenyu last
year when DP/eDP support for Sandybridge and Cougarpoint was added in
commit e3421a189447c0b8cd0aff5c299f53b5ab7c38f6.

Most of the TRANS_DP_CTL chunk inside ironlake_pch_enable should just
get moved to intel_dp_mode_set, but I don't know if the
TRANS_DP_OUTPUT_ENABLE bit needs to be set before
intel_enable_transcoder is called; if it does, then we'd need to
preserve that piece inside ironlake_pch_enable, otherwise that bit would
move to intel_dp_commit.

-- 
keith.packard@...el.com

Content of type "application/pgp-signature" skipped