usb: renesas_usbhs: add wait after initialization for R-Car Gen3

[cascardo/linux.git] / drivers / usb / renesas_usbhs / rcar3.c

diff --git a/drivers/usb/renesas_usbhs/rcar3.c b/drivers/usb/renesas_usbhs/rcar3.c
index 1d70add..d544b33 100644 (file)
--- a/drivers/usb/renesas_usbhs/rcar3.c
+++ b/drivers/usb/renesas_usbhs/rcar3.c
@@ -9,6 +9,7 @@
  *
  */
 
+#include <linux/delay.h>
 #include <linux/io.h>
 #include "common.h"
 #include "rcar3.h"
@@ -35,10 +36,13 @@ static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
 
        usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG);
 
-       if (enable)
+       if (enable) {
                usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
-       else
+               /* The controller on R-Car Gen3 needs to wait up to 45 usec */
+               udelay(45);
+       } else {
                usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
+       }
 
        return 0;
 }