media: staging: tegra-vde: Power-cycle hardware on probe

VDE partition is left turned ON after bootloader on most devices, hence
let's ensure that it's turned OFF in order to lower power leakage while
hardware is idling by turning it ON and OFF during of the driver's probe.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/staging/media/tegra-vde/vde.c b/drivers/staging/media/tegra-vde/vde.c
index 3dcf5ea..a3c24d9 100644 (file)
--- a/drivers/staging/media/tegra-vde/vde.c
+++ b/drivers/staging/media/tegra-vde/vde.c
@@ -1064,6 +1064,14 @@ static int tegra_vde_probe(struct platform_device *pdev)
        pm_runtime_use_autosuspend(dev);
        pm_runtime_set_autosuspend_delay(dev, 300);
 
+       /*
+        * VDE partition may be left ON after bootloader, hence let's
+        * power-cycle it in order to put hardware into a predictable lower
+        * power state.
+        */
+       pm_runtime_get_sync(dev);
+       pm_runtime_put(dev);
+
        return 0;
 
 err_deinit_iommu: