linux-kernel - atmel_mxt_ts on droid4: powersave seems to break the driver

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Date:   Tue, 17 Apr 2018 09:38:11 +0200
From:   Pavel Machek <pavel@....cz>
To:     mutt@....karlin.mff.cuni.cz,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, sre@...nel.org,
        nekit1000@...il.com, mpartap@....net, merlijn@...zup.org,
        nick@...anahar.org, dmitry.torokhov@...il.com, rydberg@...math.org,
        linux-input@...r.kernel.org
Subject: atmel_mxt_ts on droid4: powersave seems to break the driver

HI!

v4.17-rc1 on motorola droid 4.

If I disable/reenable touschreen with xinput, it fails, with this in
the logs:

[ 1633.749450] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[ 1655.938751] atmel_mxt_ts 1-004a: __mxt_read_reg: i2c transfer
failed (-121)
[ 1655.945800] atmel_mxt_ts 1-004a: Failed to read T44 and T5 (-121)
[ 1663.829498] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host

Unfortunately, xscreensaver seems to break it in a similar way.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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