From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, balbi@kernel.org, Yoshihiro Shimoda Subject: [PATCH 4.8 055/138] usb: renesas_usbhs: add wait after initialization for R-Car Gen3 Date: Wed, 9 Nov 2016 11:45:38 +0100 Message-Id: <20161109102847.269465298@linuxfoundation.org> In-Reply-To: <20161109102844.808685475@linuxfoundation.org> References: <20161109102844.808685475@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yoshihiro Shimoda commit b76032396d7958f006bccf5fb2535beb5526837c upstream. 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: de18757e272d ("usb: renesas_usbhs: add R-Car Gen3 power control") Cc: Signed-off-by: Yoshihiro Shimoda Signed-off-by: Greg Kroah-Hartman --- drivers/usb/renesas_usbhs/rcar3.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/usb/renesas_usbhs/rcar3.c +++ b/drivers/usb/renesas_usbhs/rcar3.c @@ -9,6 +9,7 @@ * */ +#include #include #include "common.h" #include "rcar3.h" @@ -35,10 +36,13 @@ static int usbhs_rcar3_power_ctrl(struct 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; }