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

[Keith Packard]

On Wed, 02 Nov 2011 11:29:53 -0400, Adam Jackson <ajax at redhat.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 at intel.com
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