linux-kernel - [PATCH 4.2 195/258] usb: phy: phy-generic: Fix reset behaviour on legacy boot

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Message-Id: <20151018014739.253318547@linuxfoundation.org>
Date:	Sat, 17 Oct 2015 18:58:28 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Roger Quadros <rogerq@...com>, Felipe Balbi <balbi@...com>
Subject: [PATCH 4.2 195/258] usb: phy: phy-generic: Fix reset behaviour on legacy boot

4.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Roger Quadros <rogerq@...com>

commit 762982db33b23029e98c844611e2e8beeb75bc0d upstream.

The gpio-desc migration done in v4.0 caused a regression
with legacy boots due to reversed reset logic.
e.g. omap3-beagle USB host breaks on legacy boot.

Request the reset GPIO with GPIOF_ACTIVE_LOW flag so that
it matches the driver logic and pin behaviour.

Fixes: e9f2cefb0cdc ("usb: phy: generic: migrate to gpio_desc")
Tested-by: Fabio Estevam <fabio.estevam@...escale.com>
Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/phy/phy-generic.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -230,7 +230,8 @@ int usb_phy_gen_create_phy(struct device
 		clk_rate = pdata->clk_rate;
 		needs_vcc = pdata->needs_vcc;
 		if (gpio_is_valid(pdata->gpio_reset)) {
-			err = devm_gpio_request_one(dev, pdata->gpio_reset, 0,
+			err = devm_gpio_request_one(dev, pdata->gpio_reset,
+						    GPIOF_ACTIVE_LOW,
 						    dev_name(dev));
 			if (!err)
 				nop->gpiod_reset =


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