diff mbox series

[2/3] USB: host: ohci-at91: suspend: delay needed before to stop clocks

Message ID 20190911064154.28633-3-nicolas.ferre@microchip.com (mailing list archive)
State Mainlined
Commit a3bf4d6816556baa9a503c9232eb7e3f018ff8dc
Headers show
Series USB: host: ohci-at91: tailor power consumption | expand

Commit Message

Nicolas Ferre Sept. 11, 2019, 6:41 a.m. UTC 
In order to completely remove marginal power consumption in PM suspend,
we need to let the controller settle down before being stopped.
In ohci_hcd_at91_drv_suspend() function, one additional delay is needed before
to stop the clocks.

Reported-by: Boris Krasnovskiy <Boris.Krasnovskiy@lairdconnect.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
---
 drivers/usb/host/ohci-at91.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index cb63bcd5049a..85d67fe42d59 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -628,6 +628,7 @@  ohci_hcd_at91_drv_suspend(struct device *dev)
 
 		/* flush the writes */
 		(void) ohci_readl (ohci, &ohci->regs->control);
+		msleep(1);
 		at91_stop_clock(ohci_at91);
 	}