linux-kernel - [PATCH 3/3] usb: dwc3: host: pass quirk-broken-port-ped property for known broken revisions

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Message-ID: <1479394881-13863-4-git-send-email-rogerq@ti.com>
Date:   Thu, 17 Nov 2016 17:01:21 +0200
From:   Roger Quadros <rogerq@...com>
To:     <balbi@...nel.org>, <mathias.nyman@...el.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rogerq@...com>
Subject: [PATCH 3/3] usb: dwc3: host: pass quirk-broken-port-ped property for known broken revisions

From: Felipe Balbi <balbi@...com>

dwc3 revisions <=3.00a have a limitation where Port Disable command
doesn't work. Set the quirk-broken-port-ped property for such
controllers so XHCI core can do the necessary workaround.

[rogerq@...com] Updated code from platform data to device property.

Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/dwc3/host.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index f6533c6..626d87d 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -21,11 +21,12 @@
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
-	struct property_entry	props[2];
+	struct property_entry	props[3];
 	struct platform_device	*xhci;
 	int			ret, irq;
 	struct resource		*res;
 	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
+	int			prop_idx = 0;
 
 	irq = platform_get_irq_byname(dwc3_pdev, "host");
 	if (irq == -EPROBE_DEFER)
@@ -89,8 +90,22 @@ int dwc3_host_init(struct dwc3 *dwc)
 
 	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 
-	if (dwc->usb3_lpm_capable) {
-		props[0].name = "usb3-lpm-capable";
+	if (dwc->usb3_lpm_capable)
+		props[prop_idx++].name = "usb3-lpm-capable";
+
+	/**
+	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
+	 * where Port Disable command doesn't work.
+	 *
+	 * The suggested workaround is that we avoid Port Disable
+	 * completely.
+	 *
+	 * This following flag tells XHCI to do just that.
+	 */
+	if (dwc->revision <= DWC3_REVISION_300A)
+		props[prop_idx++].name = "quirk-broken-port-ped";
+
+	if (prop_idx) {
 		ret = platform_device_add_properties(xhci, props);
 		if (ret) {
 			dev_err(dwc->dev, "failed to add properties to xHCI\n");
-- 
2.7.4