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drm: rcar-du: Shutdown the display on system shutdown
[ Upstream commit 015f2eb ] When the system shuts down or warm reboots, the display may be active, with the hardware accessing system memory. Upon reboot, the DDR will not be accessible, which may cause issues. Implement the platform_driver .shutdown() operation and shut down the display to fix this. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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