linux-kernel - [PATCH 3.16 085/134] mfd: omap-usb-tll: Fix inverted bit use for USB TLL mode

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Message-ID: <lsq.1503062000.924568071@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Tony Lindgren" <tony@...mide.com>,
        "Roger Quadros" <rogerq@...com>, "Lee Jones" <lee.jones@...aro.org>
Subject: [PATCH 3.16 085/134] mfd: omap-usb-tll: Fix inverted bit use for
 USB TLL mode

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mfd/omap-usb-tll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mfd/omap-usb-tll.c
+++ b/drivers/mfd/omap-usb-tll.c
@@ -376,8 +376,8 @@ int omap_tll_init(struct usbhs_omap_plat
 				 * 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) {
 				/*