usb: host: ohci-at91: suspend/resume ports after/before OHCI accesses

On SAMA7G5 suspending ports will cut the access to OHCI registers and
any subsequent access to them will lead to CPU being blocked trying to
access that memory. Same thing happens on resume: if OHCI memory is
accessed before resuming ports the CPU will block on that access. The
OCHI memory is accessed on suspend/resume though
ohci_suspend()/ohci_resume().

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210721132905.1970713-1-claudiu.beznea@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 9bbd7dd..a24aea3 100644 (file)
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -611,8 +611,6 @@ ohci_hcd_at91_drv_suspend(struct device *dev)
        if (ohci_at91->wakeup)
                enable_irq_wake(hcd->irq);
 
-       ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
-
        ret = ohci_suspend(hcd, ohci_at91->wakeup);
        if (ret) {
                if (ohci_at91->wakeup)
@@ -632,7 +630,10 @@ ohci_hcd_at91_drv_suspend(struct device *dev)
                /* flush the writes */
                (void) ohci_readl (ohci, &ohci->regs->control);
                msleep(1);
+               ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
                at91_stop_clock(ohci_at91);
+       } else {
+               ohci_at91_port_suspend(ohci_at91->sfr_regmap, 1);
        }
 
        return ret;
@@ -644,6 +645,8 @@ 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);
 
+       ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0);
+
        if (ohci_at91->wakeup)
                disable_irq_wake(hcd->irq);
        else
@@ -651,8 +654,6 @@ ohci_hcd_at91_drv_resume(struct device *dev)
 
        ohci_resume(hcd, false);
 
-       ohci_at91_port_suspend(ohci_at91->sfr_regmap, 0);
-
        return 0;
 }