drm/ast: Enable and disable screen in primary-plane functions
Enabling and disabling the screen used to be done in the register initialization and the DPMS function. None of these places is related to the screen's output. Now the primary plane's update and disable functions handle screen display state. The primary plane can now be switched off without displaying garbage. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191202111557.15176-3-tzimmermann@suse.de
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