linux-kernel - [PATCH v1 3/3] usb: dwc3: gadget: Skip endpoints ep[18]{in,out} on Intel Merrifield

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Message-ID: <20250116154117.148915-4-andriy.shevchenko@linux.intel.com>
Date: Thu, 16 Jan 2025 17:40:48 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Felipe Balbi <balbi@...nel.org>,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ferry Toth <fntoth@...il.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 3/3] usb: dwc3: gadget: Skip endpoints ep[18]{in,out} on Intel Merrifield

Intel Merrifield SoC uses these endpoints for tracing and they shouldn't
be used for normal transfers, we need to skip them.

• 1 High BW Bulk IN (IN#1) (RTIT)
• 1 1KB BW Bulk IN (IN#8) + 1 1KB BW Bulk OUT (Run Control) (OUT#8)

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/usb/dwc3/dwc3-pci.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 052852f80146..9b73dfd34823 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -148,11 +148,20 @@ static const struct property_entry dwc3_pci_intel_byt_properties[] = {
 	{}
 };
 
+/*
+ * Intel Merrifield uses these endpoints for tracing and they shouldn't be used
+ * for normal transfers, we need to skip them.
+ * • 1 High BW Bulk IN (IN#1) (RTIT)
+ * • 1 1KB BW Bulk IN (IN#8) + 1 1KB BW Bulk OUT (Run Control) (OUT#8)
+ */
+static const u8 dwc3_pci_mrfld_reserved_endpoints[] = { 3, 16, 17 };
+
 static const struct property_entry dwc3_pci_mrfld_properties[] = {
 	PROPERTY_ENTRY_STRING("dr_mode", "otg"),
 	PROPERTY_ENTRY_STRING("linux,extcon-name", "mrfld_bcove_pwrsrc"),
 	PROPERTY_ENTRY_BOOL("snps,dis_u3_susphy_quirk"),
 	PROPERTY_ENTRY_BOOL("snps,dis_u2_susphy_quirk"),
+	PROPERTY_ENTRY_U8_ARRAY("snps,reserved-endpoints", dwc3_pci_mrfld_reserved_endpoints),
 	PROPERTY_ENTRY_BOOL("snps,usb2-gadget-lpm-disable"),
 	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
 	{}
-- 
2.43.0.rc1.1336.g36b5255a03ac