arm: tegra: usb: Fix First SOF corruption.

In ULPI phy first SOF after Reset may be corrupt. Fixing this issue.

Bug 1012500

Change-Id: I45ee1b4c8e0a29298c94813030d22291b79e417b
Signed-off-by: Suresh Mangipudi <smangipudi@nvidia.com>
Reviewed-on: http://git-master/r/117635
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>

2 files changed, 29 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/tegra3_usb_phy.c b/arch/arm/mach-tegra/tegra3_usb_phy.c
index 3152bdf9e107..0b8ab076693d 100644
--- a/arch/arm/mach-tegra/tegra3_usb_phy.c
+++ b/arch/arm/mach-tegra/tegra3_usb_phy.c
@@ -2576,7 +2576,16 @@ static int ulpi_null_phy_init(struct tegra_usb_phy *phy)
 
 static int ulpi_null_phy_irq(struct tegra_usb_phy *phy)
 {
+	unsigned long val;
+	void __iomem *base = phy->regs;
+
 	usb_phy_fence_read(phy);
+	if (phy->bus_reseting){
+		val = readl(base + USB_USBCMD);
+		val |= USB_USBCMD_RS;
+		writel(val, base + USB_USBCMD);
+		phy->bus_reseting = false;
+	}
 	return IRQ_HANDLED;
 }
 
@@ -2602,6 +2611,23 @@ static int ulpi_null_phy_cmd_reset(struct tegra_usb_phy *phy)
 	return 0;
 }
 
+static int ulpi_phy_bus_reset(struct tegra_usb_phy *phy)
+{
+	unsigned long val;
+	void __iomem *base = phy->regs;
+
+	DBG("%s(%d) inst:[%d]\n", __func__, __LINE__, phy->inst);
+
+	/*DISABLE RUN BIT */
+
+	val = readl(base + USB_USBCMD);
+	val &= ~USB_USBCMD_RS;
+	writel(val, base + USB_USBCMD);
+	phy->bus_reseting = true;
+
+	return 0;
+}
+
 static int ulpi_null_phy_restore(struct tegra_usb_phy *phy)
 {
 	struct tegra_ulpi_config *config = &phy->pdata->u_cfg.ulpi;
@@ -2774,6 +2800,7 @@ static int ulpi_null_phy_power_on(struct tegra_usb_phy *phy)
 	}
 	udelay(10);
 
+	phy->bus_reseting = false;
 	phy->phy_clk_on = true;
 	phy->hw_accessible = true;
 
@@ -2857,6 +2884,7 @@ static struct tegra_usb_phy_ops ulpi_null_phy_ops = {
 	.resume = ulpi_null_phy_resume,
 	.post_resume = ulpi_null_phy_post_resume,
 	.reset		= ulpi_null_phy_cmd_reset,
+	.bus_reset	= ulpi_phy_bus_reset,
 };
 
 static struct tegra_usb_phy_ops ulpi_link_phy_ops;
diff --git a/arch/arm/mach-tegra/tegra_usb_phy.h b/arch/arm/mach-tegra/tegra_usb_phy.h
index 731632d23679..7e85a4b02282 100644
--- a/arch/arm/mach-tegra/tegra_usb_phy.h
+++ b/arch/arm/mach-tegra/tegra_usb_phy.h
@@ -96,6 +96,7 @@ struct tegra_usb_phy {
 	bool hw_accessible;
 	bool ulpi_clk_padout_ena;
 	bool pmc_sleepwalk;
+	bool bus_reseting;
 };
 
 int usb_phy_reg_status_wait(void __iomem *reg, u32 mask,