linux-kernel - [PATCH v2] usb: core: hub: disable autosuspend for TI TUSB8041

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Date:   Mon, 19 Dec 2022 13:47:59 +0100
From:   Flavio Suligoi <f.suligoi@...m.it>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Ray Chi <raychi@...gle.com>,
        Bhuvanesh Surachari <Bhuvanesh_Surachari@...tor.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Flavio Suligoi <f.suligoi@...m.it>
Subject: [PATCH v2] usb: core: hub: disable autosuspend for TI TUSB8041

The Texas Instruments TUSB8041 has an autosuspend problem at high
temperature.

If there is not USB traffic, after a couple of ms, the device enters in
autosuspend mode. In this condition the external clock stops working, to
save energy. When the USB activity turns on, ther hub exits the
autosuspend state, the clock starts running again and all works fine.

At ambient temperature all works correctly, but at high temperature,
when the USB activity turns on, the external clock doesn't restart and
the hub disappears from the USB bus.

Disabling the autosuspend mode for this hub solves the issue.

Signed-off-by: Flavio Suligoi <f.suligoi@...m.it>
---

v2: set TUSB8041 vendor id directly as hexnumber, instead of a complex formula

 drivers/usb/core/hub.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 77e73fc8d673..9eca403af2a8 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -44,6 +44,9 @@
 #define USB_PRODUCT_USB5534B			0x5534
 #define USB_VENDOR_CYPRESS			0x04b4
 #define USB_PRODUCT_CY7C65632			0x6570
+#define USB_VENDOR_TEXAS_INSTRUMENTS		0x0451
+#define USB_PRODUCT_TUSB8041_USB3		0x8140
+#define USB_PRODUCT_TUSB8041_USB2		0x8142
 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND	0x01
 #define HUB_QUIRK_DISABLE_AUTOSUSPEND		0x02
 
@@ -5854,6 +5857,16 @@ static const struct usb_device_id hub_id_table[] = {
       .idVendor = USB_VENDOR_GENESYS_LOGIC,
       .bInterfaceClass = USB_CLASS_HUB,
       .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
+    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+			| USB_DEVICE_ID_MATCH_PRODUCT,
+      .idVendor = USB_VENDOR_TEXAS_INSTRUMENTS,
+      .idProduct = USB_PRODUCT_TUSB8041_USB2,
+      .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
+    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
+			| USB_DEVICE_ID_MATCH_PRODUCT,
+      .idVendor = USB_VENDOR_TEXAS_INSTRUMENTS,
+      .idProduct = USB_PRODUCT_TUSB8041_USB3,
+      .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
     { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
       .bDeviceClass = USB_CLASS_HUB},
     { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
-- 
2.25.1