patches/1738-usb-dwc2-add-optional-usb-ecc-reset-bit.patch

From 0ea91b8916db050fb4d806630d4e429d3fe737fb Mon Sep 17 00:00:00 2001
From: Dinh Nguyen <dinguyen@kernel.org>
Date: Wed, 1 Nov 2017 10:34:53 -0500
Subject: [PATCH 1738/1795] usb: dwc2: add optional usb ecc reset bit

The dwc2 USB controller in Stratix10 has an additional ECC reset bit that
needs to get de-asserted in order for the controller to work properly.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
(cherry picked from commit f2830ad455ec0fdc386baeb9d654f7095bf849da)
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/usb/dwc2/core.h     |  1 +
 drivers/usb/dwc2/platform.c | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 70cea7441650..f5166573a0c1 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -922,6 +922,7 @@ struct dwc2_hsotg {
 	int     irq;
 	struct clk *clk;
 	struct reset_control *reset;
+	struct reset_control *reset_ecc;
 
 	unsigned int queuing_high_bandwidth:1;
 	unsigned int srp_success:1;
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 3e26550d13dd..4703478f702f 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -221,6 +221,15 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
 
 	reset_control_deassert(hsotg->reset);
 
+	hsotg->reset_ecc = devm_reset_control_get_optional(hsotg->dev, "dwc2-ecc");
+	if (IS_ERR(hsotg->reset_ecc)) {
+		ret = PTR_ERR(hsotg->reset_ecc);
+		dev_err(hsotg->dev, "error getting reset control for ecc %d\n", ret);
+		return ret;
+	}
+
+	reset_control_deassert(hsotg->reset_ecc);
+
 	/* Set default UTMI width */
 	hsotg->phyif = GUSBCFG_PHYIF16;
 
@@ -319,6 +328,7 @@ static int dwc2_driver_remove(struct platform_device *dev)
 		dwc2_lowlevel_hw_disable(hsotg);
 
 	reset_control_assert(hsotg->reset);
+	reset_control_assert(hsotg->reset_ecc);
 
 	return 0;
 }
-- 
2.19.0