linux-kernel - pwm_bl on i.MX6Q broken on 5.4-RC1+

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: <CAHCN7xJSz+QhOb4vE6b67jh5jnSOHnw79EyX8RW91TqPkD__Lw@mail.gmail.com>
Date:   Wed, 16 Oct 2019 14:55:54 -0500
From:   Adam Ford <aford173@...il.com>
To:     Uwe Kleine-König <uwe@...ine-koenig.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pwm@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>
Subject: pwm_bl on i.MX6Q broken on 5.4-RC1+

I have an i.MX6Q with an LCD and PWM controlled backlight.  On 5.4-RC1
through the current master (16 Oct 2019), the backlight does not come
on by default.  I can get it come on by manually setting the
brightness, but any video activity seems to blank the screen again
until I change the brightness again.

I bisected the patch to 01ccf903edd6 ("pwm: Let pwm_get_state() return
the last implemented state")

If I revert this patch on 5.4-rc3, the issue goes away.

I was hoping someone might have a suggestion on how to fix it to play
nicely with the iMX6Q PWM or revert if no solution can be found.

thank you,

adam