linux-kernel - [PATCH v2 3/3] usb: dwc3: pci: ID for Tiger Lake CPU

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Message-Id: <20210111141045.14027-4-heikki.krogerus@linux.intel.com>
Date:   Mon, 11 Jan 2021 17:10:45 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Felipe Balbi <balbi@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: [PATCH v2 3/3] usb: dwc3: pci: ID for Tiger Lake CPU

Tiger Lake SOC (the versions of it that have integrated USB4
controller) may have two DWC3 controllers. One is part of
the PCH (Platform Controller Hub, i.e. the chipset) as
usual, and the other is inside the actual CPU block.

On all Intel platforms that have the two separate DWC3
controllers, the one inside the CPU handles USB3 and only
USB3 traffic, while the PCH version handles USB2 and USB2
alone. The reason for splitting the two busses like this is
to allow easy USB3 tunneling over USB4 connections. As USB2
is not tunneled over USB4, it has dedicated USB controllers
(both xHCI and DWC3).

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/usb/dwc3/dwc3-pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index 037bc21bffa66..51029cec119ed 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -41,6 +41,7 @@
 #define PCI_DEVICE_ID_INTEL_TGPH		0x43ee
 #define PCI_DEVICE_ID_INTEL_JSP			0x4dee
 #define PCI_DEVICE_ID_INTEL_ADLS		0x7ae1
+#define PCI_DEVICE_ID_INTEL_TGL			0x9a15
 
 #define PCI_INTEL_BXT_DSM_GUID		"732b85d5-b7a7-4a1b-9ba0-4bbd00ffd511"
 #define PCI_INTEL_BXT_FUNC_PMU_PWR	4
@@ -384,6 +385,9 @@ static const struct pci_device_id dwc3_pci_id_table[] = {
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ADLS),
 	  (kernel_ulong_t) &dwc3_pci_intel_swnode, },
 
+	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_TGL),
+	  (kernel_ulong_t) &dwc3_pci_intel_swnode, },
+
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_NL_USB),
 	  (kernel_ulong_t) &dwc3_pci_amd_swnode, },
 	{  }	/* Terminating Entry */
-- 
2.29.2