diff options
| author | Venkat Moganty <vmoganty@nvidia.com> | 2010-09-28 21:32:08 +0530 |
|---|---|---|
| committer | Yu-Huan Hsu <yhsu@nvidia.com> | 2010-10-05 22:16:52 -0700 |
| commit | 8eaa0afc05248d324ec8d46a557740a043d8e641 (patch) | |
| tree | 0f7171394565be89e65a903f3f747e02da64be0a /drivers | |
| parent | 37950bcdd4fdd21b0ff0770c9c5c2fb8c50fbfff (diff) | |
[tegra-ehci]USB device detection for host mode in LP0
USB devices are not recognised when connected to the USB port, when system is
already in LP0. Root port power is not getting enabled when resume from LP0.
By the time root hub checks for the port connection auto suspend is getting
called and device is not recognised. Fixed this by enabling the root port power
during the ehci_restart functionality.
Bug 741890
(cherry picked from commit 188bf7050751a40d6f2d6a858e2702774fc70f77)
Change-Id: Ib88ed3fc4b01719777a0e49e27434ef6425bc53d
Reviewed-on: http://git-master/r/7834
Reviewed-by: Hanumanth Venkateswa Moganty <vmoganty@nvidia.com>
Tested-by: Hanumanth Venkateswa Moganty <vmoganty@nvidia.com>
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
Diffstat (limited to 'drivers')
| -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 54c9ab28b580..1d24a03cd903 100644 --- a/drivers/usb/host/ehci-tegra.c +++ b/drivers/usb/host/ehci-tegra.c @@ -177,6 +177,12 @@ static void tegra_ehci_restart (struct usb_hcd *hcd) ehci->command |= CMD_RUN; ehci_writel(ehci, ehci->command, &ehci->regs->command); + /* Enable the root Port Power */ + if (HCS_PPC (ehci->hcs_params)) { + temp = ehci_readl(ehci, &ehci->regs->port_status[0]); + ehci_writel(ehci, temp | PORT_POWER, &ehci->regs->port_status[0]); + } + down_write(&ehci_cf_port_reset_rwsem); hcd->state = HC_STATE_RUNNING; /* unblock posted writes */ |