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

Since the controller on R-Car Gen3 doesn't have any status registers
to detect initialization (LPSTS.SUSPM = 1) and the initialization needs
up to 45 usec, this patch adds wait after the initialization. Otherwise,
writing other registers (e.g. INTENB0) will fail.

Fixes: de18757e27 ("usb: renesas_usbhs: add R-Car Gen3 power control")
Cc: <stable@vger.kernel.org> # v4.6+
Cc: <balbi@kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda 2016-10-20 13:19:19 +09:00 committed by Greg Kroah-Hartman
parent ed6d6f8f42
commit b76032396d
1 changed files with 6 additions and 2 deletions
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8
drivers/usb/renesas_usbhs/rcar3.c
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@ -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;
}