drm: rcar-du: Shutdown the display on system shutdown

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>

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index e289a66..9788286 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -561,6 +561,13 @@ static int rcar_du_remove(struct platform_device *pdev)
        return 0;
 }
 
+static void rcar_du_shutdown(struct platform_device *pdev)
+{
+       struct rcar_du_device *rcdu = platform_get_drvdata(pdev);
+
+       drm_atomic_helper_shutdown(&rcdu->ddev);
+}
+
 static int rcar_du_probe(struct platform_device *pdev)
 {
        struct rcar_du_device *rcdu;
@@ -615,6 +622,7 @@ error:
 static struct platform_driver rcar_du_platform_driver = {
        .probe          = rcar_du_probe,
        .remove         = rcar_du_remove,
+       .shutdown       = rcar_du_shutdown,
        .driver         = {
                .name   = "rcar-du",
                .pm     = &rcar_du_pm_ops,