linux-kernel - Re: [PATCH v5 0/4] drm/dp: Rework LTTPR transparent mode handling and add support to msm driver

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Message-ID: <82aceba0aacced82358bc4870fca498d45e2f108.camel@redhat.com>
Date: Tue, 25 Feb 2025 12:45:55 -0500
From: Lyude Paul <lyude@...hat.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>, Dmitry Baryshkov
	 <dmitry.baryshkov@...aro.org>, Abel Vesa <abel.vesa@...aro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard	
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
	 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Karol Herbst	
 <kherbst@...hat.com>, Danilo Krummrich <dakr@...hat.com>, Rodrigo Vivi	
 <rodrigo.vivi@...el.com>, Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>,  Tvrtko Ursulin <tursulin@...ulin.net>,
 Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
  Sean Paul <sean@...rly.run>, Marijn Suijten
 <marijn.suijten@...ainline.org>, Bjorn Andersson	 <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Johan Hovold	 <johan@...nel.org>,
 dri-devel@...ts.freedesktop.org, 	linux-kernel@...r.kernel.org,
 nouveau@...ts.freedesktop.org, 	intel-gfx@...ts.freedesktop.org,
 intel-xe@...ts.freedesktop.org, 	linux-arm-msm@...r.kernel.org,
 freedreno@...ts.freedesktop.org, Johan Hovold	 <johan+linaro@...nel.org>,
 Imre Deak <imre.deak@...el.com>
Subject: Re: [PATCH v5 0/4] drm/dp: Rework LTTPR transparent mode handling
 and add support to msm driver

On Tue, 2025-02-25 at 13:29 +0200, Jani Nikula wrote:
> On Fri, 21 Feb 2025, Dmitry Baryshkov <dmitry.baryshkov@...aro.org> wrote:
> > On Mon, Feb 03, 2025 at 12:57:55PM +0200, Abel Vesa wrote:
> > > Looking at both i915 and nouveau DP drivers, both are setting the first
> > > LTTPR (if found) in transparent mode first and then in non-transparent
> > > mode, just like the DP v2.0 specification mentions in section 3.6.6.1.
> > > 
> > > Being part of the standard, setting the LTTPR in a specific operation mode
> > > can be easily moved in the generic framework. So do that by adding a new
> > > helper.
> > > 
> > > Then, the msm DP driver is lacking any kind of support for LTTPR handling,
> > > so add it by reading the LTTPR caps for figuring out the number of LTTPRs
> > > found on plug detect and then do exactly what the i915 and nouveau drivers
> > > do with respect to toggling through operating modes, just like the
> > > up-mentioned section from DP spec describes.
> > > 
> > > At some point, link training per sub-segment will probably be needed, but
> > > for now, toggling the operating modes seems to be enough at least for the
> > > X Elite-based platforms that this patchset has been tested on.
> > > 
> > > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > 
> > [...]
> > > 
> > > ---
> > > Abel Vesa (4):
> > >       drm/dp: Add helper to set LTTPRs in transparent mode
> > >       drm/nouveau/dp: Use the generic helper to control LTTPR transparent mode
> > >       drm/i915/dp: Use the generic helper to control LTTPR transparent mode
> > 
> > Lyude, Jani, what would be your preferred way of merging these patches?
> > Would you ack merging of those through drm-misc or would you prefer for
> > the first patch only to be landed to drm-misc, which you can then pull
> > into nouveau and i915 trees.
> 
> Either way is fine with me, up to you. But please try to ensure these
> get into drm-misc-next pull request by this cycle, so we can backmerge
> and catch up sooner rather than later.
> 
> Acked-by: Jani Nikula <jani.nikula@...el.com>

Same for me - I'm fine with either:

Acked-by: Lyude Paul <lyude@...hat.com>

> 
> 
> 
> > 
> > >       drm/msm/dp: Add support for LTTPR handling
> > > 
> > >  drivers/gpu/drm/display/drm_dp_helper.c            | 61 ++++++++++++++++++++++
> > >  .../gpu/drm/i915/display/intel_dp_link_training.c  | 24 ++-------
> > >  drivers/gpu/drm/msm/dp/dp_display.c                | 15 ++++++
> > >  drivers/gpu/drm/nouveau/nouveau_dp.c               | 17 +-----
> > >  include/drm/display/drm_dp_helper.h                |  2 +
> > >  5 files changed, 85 insertions(+), 34 deletions(-)
> > > ---
> > > base-commit: 00f3246adeeacbda0bd0b303604e46eb59c32e6e
> > > change-id: 20241031-drm-dp-msm-add-lttpr-transparent-mode-set-136cd5bfde07
> > > 
> > > Best regards,
> > > -- 
> > > Abel Vesa <abel.vesa@...aro.org>
> > > 
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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