linux-kernel - [PATCH 0/5] drm/panel: Panel Refcounting infrastructure

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Message-Id: <20250325-b4-panel-refcounting-v1-0-4e2bf5d19c5d@redhat.com>
Date: Tue, 25 Mar 2025 13:24:07 -0400
From: Anusha Srivatsa <asrivats@...hat.com>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 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>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Anusha Srivatsa <asrivats@...hat.com>
Subject: [PATCH 0/5] drm/panel: Panel Refcounting infrastructure

This series adds the infrastructure needed for the refcounting
allocations for panels similar to Luca's efforts with bridges.
Underlying intention and idea is the same - avoid use-after-free
situations in panels. Get reference to panel when in use and put
the reference back (down) when not in use.
Once this gets approved, rest of the drivers will have to be
mass converted to use this API.  All the callers of of_drm_find_panel()
will have to be converted too.

Tried to split the patches as suggested in the RFC series[1].
Also fixed the connector used during panel_init to be the one
passed by driver.

Patch 4 was not suggested or part of my initial work. Added it
after looking at the comments Luca's v8 of the bridge series
received.[2]

[1] -> https://patchwork.freedesktop.org/series/146236/
[2] -> https://patchwork.freedesktop.org/series/146306/#rev2

Suggested-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Anusha Srivatsa <asrivats@...hat.com>
---
Anusha Srivatsa (5):
      drm/panel: Add new helpers for refcounted panel allocatons
      drm/panel: Add refcount support
      drm/panel: get/put panel reference in drm_panel_add/remove()
      drm/panel: deprecate old-style panel allocation
      drm/panel/panel-simple: Use the new allocation in place of devm_kzalloc()

 drivers/gpu/drm/drm_panel.c          | 96 +++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/panel/panel-simple.c |  5 +-
 include/drm/drm_panel.h              | 39 +++++++++++++++
 3 files changed, 135 insertions(+), 5 deletions(-)
---
base-commit: c8ba07caaecc622a9922cda49f24790821af8a71
change-id: 20250324-b4-panel-refcounting-40ab56aa34f7

Best regards,
-- 
Anusha Srivatsa <asrivats@...hat.com>