diff options
| author | Bo Yan <byan@nvidia.com> | 2011-08-24 10:31:31 -0700 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:48:48 -0800 |
| commit | 5e9678f72a508026a953cb92b51791c8e48f7cb0 (patch) | |
| tree | ee4b6b1a61ceddfba24619d9d46e147076808352 /drivers/usb/host/ehci-tegra.c | |
| parent | fc7a71e8979e2740dddf52b9182b601a512fb1ea (diff) | |
usb: ehci: tegra: Synchronize suspend and shutdown
Synchronize shutdown with suspend, this is to prevent
race condition between shutdown and suspend
Bug 798849
Original-Change-Id: I61cc2a03cef15d1656ad41bfefff446910210ffd
Reviewed-on: http://git-master/r/49013
Reviewed-by: Bo Yan <byan@nvidia.com>
Tested-by: Bo Yan <byan@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Rebase-Id: Rb867cf2a4d3e42fca0eac5aaf6eb7554468cce88
Diffstat (limited to 'drivers/usb/host/ehci-tegra.c')
| -rw-r--r-- | drivers/usb/host/ehci-tegra.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c index 20aba66b9592..2e5b001691cd 100644 --- a/drivers/usb/host/ehci-tegra.c +++ b/drivers/usb/host/ehci-tegra.c @@ -686,6 +686,11 @@ static int tegra_ehci_bus_suspend(struct usb_hcd *hcd) u32 port_status; int error_status = 0; + mutex_lock(&tegra->tegra_ehci_hcd_mutex); + /* ehci_shutdown touches the USB controller registers, make sure + * controller has clocks to it */ + if (!tegra->host_resumed) + tegra_ehci_power_up(hcd, false); error_status = ehci_bus_suspend(hcd); if (!error_status && tegra->power_down_on_bus_suspend) { port_status = ehci_readl(ehci, &ehci->regs->port_status[0]); @@ -695,6 +700,7 @@ static int tegra_ehci_bus_suspend(struct usb_hcd *hcd) } } tegra_usb_phy_postsuspend(tegra->phy, false); + mutex_unlock(&tegra->tegra_ehci_hcd_mutex); return error_status; } |