iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

media: staging: tegra-vde: Turn ON power domain on shutdown

Browse Source 
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: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Dmitry Osipenko 2020-06-24 17:08:46 +02:00 committed by Mauro Carvalho Chehab
parent c19c7a13ee
commit 8f0c714ad9
1 changed files with 19 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/staging/media/tegra-vde/vde.c
View File

@ -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,