linux-kernel - [PATCH 3.10 097/139] mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode

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Date:   Wed,  1 Nov 2017 22:26:38 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Tony Lindgren <tony@...mide.com>, Lee Jones <lee.jones@...aro.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 097/139] mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode

From: Tony Lindgren <tony@...mide.com>

commit 8b8a84c54aff4256d592dc18346c65ecf6811b45 upstream.

Commit 16fa3dc75c22 ("mfd: omap-usb-tll: HOST TLL platform driver")
added support for USB TLL, but uses OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
bit the wrong way. The comments in the code are correct, but the inverted
use of OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF causes the register to be
enabled instead of disabled unlike what the comments say.

Without this change the Wrigley 3G LTE modem on droid 4 EHCI bus can
be only pinged few times before it stops responding.

Fixes: 16fa3dc75c22 ("mfd: omap-usb-tll: HOST TLL platform driver")
Signed-off-by: Tony Lindgren <tony@...mide.com>
Acked-by: Roger Quadros <rogerq@...com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/mfd/omap-usb-tll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
index c7576a5..2afadd0 100644
--- a/drivers/mfd/omap-usb-tll.c
+++ b/drivers/mfd/omap-usb-tll.c
@@ -380,8 +380,8 @@ int omap_tll_init(struct usbhs_omap_platform_data *pdata)
 				 * and use SDR Mode
 				 */
 				reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
-					| OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
 					| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
+				reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
 			} else if (pdata->port_mode[i] ==
 					OMAP_EHCI_PORT_MODE_HSIC) {
 				/*
-- 
2.8.0.rc2.1.gbe9624a