linux-kernel - [PATCH 0/1] drm/panel: st7703: Fix resume of XBD599 panel

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-next>] [day] [month] [year] [list]

Message-Id: <20230212120830.46880-1-frank@oltmanns.dev>
Date:   Sun, 12 Feb 2023 13:08:28 +0100
From:   Frank Oltmanns <frank@...manns.dev>
To:     Guido Günther <agx@...xcpu.org>,
        Purism Kernel Team <kernel@...i.sm>,
        Ondrej Jirman <megous@...ous.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org (open list:DRM PANEL DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Cc:     Frank Oltmanns <frank@...manns.dev>
Subject: [PATCH 0/1] drm/panel: st7703: Fix resume of XBD599 panel

This patch fixes flickering after resume from sleep on panel
xingbangda,xbd599 (e.g. used in PinePhone).

It was originally submitted by Ondrej Jirman in July 2020:
https://lore.kernel.org/all/20200716123753.3552425-1-megous@megous.com/

The original patchset contained two patches. This submission fixes the
patch that broke handling of the JH057N panel of the Purism Librem 5.

In essence, it does not change any behavior towards the JH057N panel,
but only affects the XDB599.

The patch is just a refactoring of Ondřej's original patch, that is
already used today by PinePhone distributions like PostmarketOS.

I was torn between using function pointers and just calling msleep()
with device specific delays. I decided to go with function pointers,
because my understanding is that calling msleep(0), which would be
required for waiting for the JH057N display to discharge, still results
in a delay. The empty function I used has no side effect on that panel.

The patch is based on drm-next.

Ondřej, since this is just a refactoring, I would gladly add your SoB,
if you wish so.

Thanks,
  Frank

Frank Oltmanns (1):
  drm/panel: st7703: Fix resume of XBD599 panel

 drivers/gpu/drm/panel/panel-sitronix-st7703.c | 40 ++++++++++++++++---
 1 file changed, 35 insertions(+), 5 deletions(-)

-- 
2.39.1