linux-kernel - [PATCH 2/2] mfd: omap-usb-tll: Configure ULPIAUTOIDLE

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Message-Id: <20170415170509.17364-3-tony@atomide.com>
Date:   Sat, 15 Apr 2017 10:05:09 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Lee Jones <lee.jones@...aro.org>,
        Samuel Ortiz <sameo@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Keshava Munegowda <keshava_mgowda@...com>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>,
        Roger Quadros <rogerq@...com>,
        Sebastian Reichel <sre@...nel.org>
Subject: [PATCH 2/2] mfd: omap-usb-tll: Configure ULPIAUTOIDLE

The idle mode needs to be only disabled for UTMIAUTOIDLE while
ULPIAUTOIDLE can be enabled.

This matches the TLL_CHANNEL_CONF_i register configuration for ehci-tll
in the Motorola Linux kernel tree for Wrigley 3G LTE modem on droid 4
and the modem still stays responsive.

Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: Keshava Munegowda <keshava_mgowda@...com>
Cc: Marcel Partap <mpartap@....net>
Cc: Michael Scott <michael.scott@...aro.org>
Cc: Roger Quadros <rogerq@...com>
Cc: Sebastian Reichel <sre@...nel.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/mfd/omap-usb-tll.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
--- a/drivers/mfd/omap-usb-tll.c
+++ b/drivers/mfd/omap-usb-tll.c
@@ -373,12 +373,13 @@ int omap_tll_init(struct usbhs_omap_platform_data *pdata)
 			} else if (pdata->port_mode[i] ==
 					OMAP_EHCI_PORT_MODE_TLL) {
 				/*
-				 * Disable AutoIdle, BitStuffing
-				 * and use SDR Mode
+				 * Disable UTMI AutoIdle, BitStuffing
+				 * and use SDR Mode. Enable ULPI AutoIdle.
 				 */
 				reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
 					| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
 				reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
+				reg |= OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE;
 			} else if (pdata->port_mode[i] ==
 					OMAP_EHCI_PORT_MODE_HSIC) {
 				/*
-- 
2.12.2