linux-kernel - [BUG] [PATCH v5 3/7] drm/mediatek: update cursors by using async atomic update

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Message-ID: <trinity-1aeda07b-567b-4a31-a709-36199975894b-1582907687950@3c-app-gmx-bap21>
Date:   Fri, 28 Feb 2020 17:34:47 +0100
From:   "Frank Wunderlich" <frank-w@...lic-files.de>
To:     "Bibby Hsieh" <bibby.hsieh@...iatek.com>
Cc:     "David Airlie" <airlied@...ux.ie>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        "Daniel Vetter" <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, drinkcat@...omium.org,
        "Bibby Hsieh" <bibby.hsieh@...iatek.com>,
        srv_heupstream@...iatek.com, linux-kernel@...r.kernel.org,
        tfiga@...omium.org, "CK Hu" <ck.hu@...iatek.com>,
        "Thierry Reding" <thierry.reding@...il.com>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: [BUG] [PATCH v5 3/7] drm/mediatek: update cursors by using async
 atomic update

Hi,

as talked to Bibby directly, this Patch seems to create a bug with touchscreens. Cursor is displayed on old position if changing its position. e.g. Cursor was on X1,Y1 and i touch to new position X2,Y2 the "click" is recognized on right position (i try to ), but cursor is displayed on X1,Y1

have made a small video and uploaded to my gdrive [1]...

here i use lightdm login manager and selecting the username/password-fields alternately. Focus follows, but cursor is always displayed on prior position

tried to revert this commit [2], but there are many depencies failing the revert, have not yet got all depending commits reverted

regards Frank

[1] https://drive.google.com/open?id=1Qy0tYnbO9zNGdjCWY18O-dMYbFuPrq_i
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=920fffcc891276a855cb3ce1e7361d2e9cb72581