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

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Message-ID: <Y6CBiGHm7jishpYQ@rowland.harvard.edu>
Date:   Mon, 19 Dec 2022 10:21:44 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Flavio Suligoi <f.suligoi@...m.it>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: core: hub: disable autosuspend for TI TUSB8041

On Mon, Dec 19, 2022 at 01:47:59PM +0100, Flavio Suligoi wrote:
> 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>
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>

> 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
>