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authorSylvain Rochet <sylvain.rochet@finsecur.com>2015-01-20 16:39:04 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-25 16:06:42 +0300
commit1cee6b8d00427fd993c2e2b8acfd08410b053af3 (patch)
tree6c95d61938c71d2f67109466d62a75ea40a4e7a7 /drivers/usb/host/ohci-at91.c
parent3b3394aff79770681fd9a5a02cd4b70518899b78 (diff)
downloadlinux-1cee6b8d00427fd993c2e2b8acfd08410b053af3.tar.xz
USB: host: ohci-at91: Fix wake-up support
This device needs to be continuously clocked to provide wake up support, previously, if STANDBY target were chosen the device were enable_irq_wake()-prepared and clock still active and if MEM target were chosen the device were also enable_irq_wake()-prepared but not clocked anymore, which is wrong. Now, if STANDBY target is chosen the device is still clocked with wake up support enabled, which were the previous default and if MEM target is chosen the device is declocked with wake up support disabled. Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ohci-at91.c')
-rw-r--r--drivers/usb/host/ohci-at91.c27
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index e2b8b7bc08ec..7cce85a1f7dc 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -42,6 +42,7 @@ struct ohci_at91_priv {
struct clk *uclk;
struct clk *hclk;
bool clocked;
+ bool wakeup; /* Saved wake-up state for resume */
};
/* interface and function clocks; sometimes also an AHB clock */
@@ -61,6 +62,8 @@ extern int usb_disabled(void);
static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
{
+ if (ohci_at91->clocked)
+ return;
if (IS_ENABLED(CONFIG_COMMON_CLK)) {
clk_set_rate(ohci_at91->uclk, 48000000);
clk_prepare_enable(ohci_at91->uclk);
@@ -73,6 +76,8 @@ static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
{
+ if (!ohci_at91->clocked)
+ return;
clk_disable_unprepare(ohci_at91->fclk);
clk_disable_unprepare(ohci_at91->iclk);
clk_disable_unprepare(ohci_at91->hclk);
@@ -616,15 +621,22 @@ ohci_hcd_at91_drv_suspend(struct device *dev)
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
- bool do_wakeup = device_may_wakeup(dev);
int ret;
- if (do_wakeup)
+ /*
+ * Disable wakeup if we are going to sleep with slow clock mode
+ * enabled.
+ */
+ ohci_at91->wakeup = device_may_wakeup(dev)
+ && !at91_suspend_entering_slow_clock();
+
+ if (ohci_at91->wakeup)
enable_irq_wake(hcd->irq);
- ret = ohci_suspend(hcd, do_wakeup);
+ ret = ohci_suspend(hcd, ohci_at91->wakeup);
if (ret) {
- disable_irq_wake(hcd->irq);
+ if (ohci_at91->wakeup)
+ disable_irq_wake(hcd->irq);
return ret;
}
/*
@@ -634,7 +646,7 @@ ohci_hcd_at91_drv_suspend(struct device *dev)
*
* REVISIT: some boards will be able to turn VBUS off...
*/
- if (at91_suspend_entering_slow_clock()) {
+ if (!ohci_at91->wakeup) {
ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
ohci->hc_control &= OHCI_CTRL_RWC;
ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
@@ -653,11 +665,10 @@ static int ohci_hcd_at91_drv_resume(struct device *dev)
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
- if (device_may_wakeup(dev))
+ if (ohci_at91->wakeup)
disable_irq_wake(hcd->irq);
- if (!ohci_at91->clocked)
- at91_start_clock(ohci_at91);
+ at91_start_clock(ohci_at91);
ohci_resume(hcd, false);
return 0;