linux-kernel - [RFC PATCH 0/2] drm/msm/dp: refactor the msm dp driver resources

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Date:   Thu, 23 Feb 2023 19:26:33 +0530
From:   Sankeerth Billakanti <quic_sbillaka@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        <robdclark@...il.com>, <seanpaul@...omium.org>,
        <swboyd@...omium.org>, <quic_kalyant@...cinc.com>,
        <quic_abhinavk@...cinc.com>, <dianders@...omium.org>,
        <quic_khsieh@...cinc.com>, <quic_bjorande@...cinc.com>,
        <sean@...rly.run>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <dmitry.baryshkov@...aro.org>, <quic_vproddut@...cinc.com>
Subject: [RFC PATCH 0/2] drm/msm/dp: refactor the msm dp driver resources

The DP driver resources are currently enabled and disabled directly based on code flow.
As mentioned in bug 230631602, we want to do the following:

1) Refactor the dp/edp parsing code to move it to probe (it is currently done in bind).

2) Then bind all the power resources needed for AUX in pm_runtime_ops.

3) Handle EPROBE_DEFER cases of the panel-eDP aux device.

4) Verify DP functionality is unaffected.

These code changes will parse the resources and get the edp panel during probe.
All the necessary resources required for the aux transactions are moved to pm_runtime ops.
They are enabled or disabled via get/put sync functions.

This is a RFC to verify with the community if the approach we are taking is correct.

https://partnerissuetracker.corp.google.com/issues/230631602

Sankeerth Billakanti (2):
  drm/msm/dp: enumerate edp panel during driver probe
  drm/msm/dp: enable pm_runtime support for dp driver

 drivers/gpu/drm/msm/dp/dp_aux.c     | 155 +++++++++++++++++++++--
 drivers/gpu/drm/msm/dp/dp_catalog.c |  12 ++
 drivers/gpu/drm/msm/dp/dp_catalog.h |   1 +
 drivers/gpu/drm/msm/dp/dp_display.c | 185 ++++++++++++++--------------
 drivers/gpu/drm/msm/dp/dp_power.c   |   7 --
 5 files changed, 250 insertions(+), 110 deletions(-)

-- 
2.39.0