Commit 8f0c714a authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Mauro Carvalho Chehab
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media: staging: tegra-vde: Turn ON power domain on shutdown 



On some devices bootloader isn't ready to a clamped VDE power, and thus,
machine hangs on a warm reboot (CPU reset). The VDE power partition is
turned ON by default on a cold boot, hence VDE driver should keep power
partition enabled on system's reboot too. This fixes hang on a warm reboot
on a Tegra20 Acer A500 device, which is handy if Embedded Controller
driver is unavailable, i.e. cold reboot can't be performed.

Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent c19c7a13

drivers/staging/media/tegra-vde/vde.c

+19 −0
Original line number Diff line number Diff line
@@ -1081,9 +1081,17 @@ static int tegra_vde_remove(struct platform_device *pdev) 
	struct tegra_vde *vde = platform_get_drvdata(pdev);

	struct device *dev = &pdev->dev;



	pm_runtime_get_sync(dev);

	pm_runtime_dont_use_autosuspend(dev);

	pm_runtime_disable(dev);



	/*

	 * Balance RPM state, the VDE power domain is left ON and hardware

	 * is clock-gated. It's safe to reboot machine now.

	 */

	pm_runtime_put_noidle(dev);

	clk_disable_unprepare(vde->clk);



	misc_deregister(&vde->miscdev);



	tegra_vde_dmabuf_cache_unmap_all(vde);
@@ -1095,6 +1103,16 @@ static int tegra_vde_remove(struct platform_device *pdev) 
	return 0;

}



static void tegra_vde_shutdown(struct platform_device *pdev)

{

	/*

	 * On some devices bootloader isn't ready to a power-gated VDE on

	 * a warm-reboot, machine will hang in that case.

	 */

	if (pm_runtime_status_suspended(&pdev->dev))

		tegra_vde_runtime_resume(&pdev->dev);

}



static __maybe_unused int tegra_vde_pm_suspend(struct device *dev)

{

	struct tegra_vde *vde = dev_get_drvdata(dev);
@@ -1140,6 +1158,7 @@ MODULE_DEVICE_TABLE(of, tegra_vde_of_match); 
static struct platform_driver tegra_vde_driver = {

	.probe		= tegra_vde_probe,

	.remove		= tegra_vde_remove,

	.shutdown	= tegra_vde_shutdown,

	.driver		= {

		.name		= "tegra-vde",

		.of_match_table = tegra_vde_of_match,