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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>
This commit is contained in:
Claudiu Beznea 2021-07-21 16:29:05 +03:00 committed by Greg Kroah-Hartman
parent 68d9f95d6f
commit 00de6a572f
1 changed files with 5 additions and 4 deletions
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9
drivers/usb/host/ohci-at91.c
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@ -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;
}