drm/tidss: Make zpos immutable for primary plane
commit e0757b737833c0baee39cf54de96abb15a7b4a24 from git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git The new version of weston seems to be setting non-zero value of zpos for primary plane too [1]. As primary plane sits at the bottom and is always "on" and overlay planes are "overlayed" on top of primary, set zpos value of primary plane as immutable with 0 value. For overlay plane, set minimum value in range for zpos value as 1 so that it doesn't overlap with value for primary plane. This is based off : https://lore.kernel.org/linux-renesas-soc/20200401061100.7379-1-etom@igel.co.jp/ https://patchwork.kernel.org/project/linux-renesas-soc/patch/20200402104035.13497-1-laurent.pinchart+renesas@ideasonboard.com/ [1]: http://serenity.dal.design.ti.com:7777/ayoviboceg.yaml Signed-off-by:Devarsh Thakkar <devarsht@ti.com> Signed-off-by:
Vignesh Raghavendra <vigneshr@ti.com> Signed-off-by:
Xulin Sun <xulin.sun@windriver.com>
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