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 for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Thu, 12 Jul 2018 19:06:25 +0200
From:   Maxime Ripard <>
To:     Jernej Skrabec <>
Subject: Re: [PATCH v2] drm/sun4i: Implement zpos for DE2

On Fri, Jul 06, 2018 at 06:47:32PM +0200, Jernej Skrabec wrote:
> Initial implementation of DE2 planes only supported fixed zpos.
> Expand implementation with configurable zpos property.
> Implementation background:
> Channel in DE2 driver represents one DRM plane, whereas pipe is just
> mapped channel to known Z position. Pipe 0 will always be at the bottom,
> pipe 1 just above pipe 0 and so on. If, for example, channel 1 is mapped
> at pipe 0 and channel 0 at pipe 1, whatever is on channel 0 will appear
> on top.
> Before this commit, channel id was used for addressing channel related
> registers (prefixed with SUN8I_MIXER_CHAN_UI_ or SUN8I_MIXER_CHAN_VI_)
> and pipe registers (prefixed with SUN8I_MIXER_BLEND_). Additionally,
> register SUN8I_MIXER_BLEND_ROUTE, which takes care for mapping channels
> to pipes had fixed value. It mapped channel 0 to pipe 0, 1 to 1 and so
> on. Consequence of all that was fixed Z order of planes.
> With this commit, pipe registers are using zpos property as index and
> channel related registers still use channel id as index. Pipe mapping
> register is now set dynamically too and pipe enable register is rebuild
> every time to make sure only active pipes are enabled.
> Testing was done to confirm that there is no issues if bottom plane
> contains pixels with alpha value < 0xff and if it doesn't whole screen.
> Tested-by: Paul Kocialkowski <>
> Signed-off-by: Jernej Skrabec <>

Applied, thanks!

Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)

Powered by blists - more mailing lists