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USB: ehci-platform: Support ehci reset after resume quirk

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The Rockchip rk3288 EHCI controller doesn't properly detect
the case when a device is removed during suspend. Specifically,
when usb resume from suspend, the EHCI controller maintaining
the USB state (FLAG_CF is 1, Current Connect Status is 1),
but a USB device (like a USB camera on rk3288) may have been
disconnected actually.

Let's add a quirk to force ehci to go into the
usb_root_hub_lost_power() path and reset after resume.
This should generally reset the whole controller and all
ports and initialize everything cleanly again, and bring
the devices back up.

As part of this, rename the "hibernation" paramter of
ehci_resume() to force_reset since hibernation is simply
another case where we can't trust the autodetected status
and need to force a reset of devices.

Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
Reviewed-by: Julius Werner <jwerner@google.com>
Reviewed-by: Doug Anderson <dianders@google.com>
Reviewed-by: Tomasz Figa <tfiga@google.com>
Reviewed-by: Pawel Osciak <posciak@google.com>
Reviewed-by: Sonny Rao <sonnyrao@google.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Doug Anderson <dianders@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wu Liang feng 2014-12-24 18:22:19 +08:00 committed by Greg Kroah-Hartman
parent 96e418543d
commit 314b41b16a
4 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/host/ehci-hcd.c
View File

@ -1110,7 +1110,7 @@ int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
EXPORT_SYMBOL_GPL(ehci_suspend);
/* Returns 0 if power was preserved, 1 if power was lost */
int ehci_resume(struct usb_hcd *hcd, bool hibernated)
int ehci_resume(struct usb_hcd *hcd, bool force_reset)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
@ -1124,12 +1124,12 @@ int ehci_resume(struct usb_hcd *hcd, bool hibernated)
return 0; /* Controller is dead */
/*
* If CF is still set and we aren't resuming from hibernation
* If CF is still set and reset isn't forced
* then we maintained suspend power.
* Just undo the effect of ehci_suspend().
*/
if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
!hibernated) {
!force_reset) {
int mask = INTR_MASK;
ehci_prepare_ports_for_controller_resume(ehci);

6
drivers/usb/host/ehci-platform.c
View File

@ -185,6 +185,10 @@ static int ehci_platform_probe(struct platform_device *dev)
if (of_property_read_bool(dev->dev.of_node, "big-endian"))
ehci->big_endian_mmio = ehci->big_endian_desc = 1;
if (of_property_read_bool(dev->dev.of_node,
"needs-reset-on-resume"))
pdata->reset_on_resume = 1;
priv->phy = devm_phy_get(&dev->dev, "usb");
if (IS_ERR(priv->phy)) {
err = PTR_ERR(priv->phy);
@ -340,7 +344,7 @@ static int ehci_platform_resume(struct device *dev)
return err;
}
ehci_resume(hcd, false);
ehci_resume(hcd, pdata->reset_on_resume);
return 0;
}
#endif /* CONFIG_PM_SLEEP */

2
drivers/usb/host/ehci.h
View File

@ -871,7 +871,7 @@ extern int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
#ifdef CONFIG_PM
extern int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup);
extern int ehci_resume(struct usb_hcd *hcd, bool hibernated);
extern int ehci_resume(struct usb_hcd *hcd, bool force_reset);
#endif /* CONFIG_PM */
extern int ehci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,

3
include/linux/usb/ehci_pdriver.h
View File

@ -34,6 +34,8 @@ struct usb_hcd;
* after initialization.
* @no_io_watchdog: set to 1 if the controller does not need the I/O
* watchdog to run.
* @reset_on_resume: set to 1 if the controller needs to be reset after
* a suspend / resume cycle (but can't detect that itself).
*
* These are general configuration options for the EHCI controller. All of
* these options are activating more or less workarounds for some hardware.
@ -45,6 +47,7 @@ struct usb_ehci_pdata {
unsigned big_endian_desc:1;
unsigned big_endian_mmio:1;
unsigned no_io_watchdog:1;
unsigned reset_on_resume:1;
/* Turn on all power and clocks */
int (*power_on)(struct platform_device *pdev);