linux-kernel - Re: [PATCH] usb: core: hub: limit HUB_QUIRK_DISABLE

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Message-Id: <FB436128-70A8-4558-808C-E068834EBF4F@canonical.com>
Date:   Fri, 15 May 2020 10:30:57 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Eugeniu Rosca <erosca@...adit-jv.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-stable <stable@...r.kernel.org>,
        Hardik Gajjar <hgajjar@...adit-jv.com>,
        linux-renesas-soc@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: core: hub: limit HUB_QUIRK_DISABLE_AUTOSUSPEND to
 USB5534B



> On May 15, 2020, at 06:02, Eugeniu Rosca <erosca@...adit-jv.com> wrote:
> 
> On Tue, May 12, 2020 at 09:36:07PM +0800, Kai-Heng Feng wrote [1]:
>> This patch prevents my Raven Ridge xHCI from getting runtime suspend.
> 
> The problem described in v5.6 commit 1208f9e1d758c9 ("USB: hub: Fix the
> broken detection of USB3 device in SMSC hub") applies solely to the
> USB5534B hub [2] present on the Kingfisher Infotainment Carrier Board,
> manufactured by Shimafuji Electric Inc [3].
> 
> Despite that, the aforementioned commit applied the quirk to _all_ hubs
> carrying vendor ID 0x424 (i.e. SMSC), of which there are more [4] than
> initially expected. Consequently, the quirk is now enabled on platforms
> carrying SMSC/Microchip hub models which potentially don't exhibit the
> original issue.
> 
> To avoid reports like [1], further limit the quirk's scope to
> USB5534B [2], by employing both Vendor and Product ID checks.
> 
> Tested on H3ULCB + Kingfisher rev. M05.
> 
> [1] https://lore.kernel.org/linux-renesas-soc/73933975-6F0E-40F5-9584-D2B8F615C0F3@canonical.com/
> [2] https://www.microchip.com/wwwproducts/en/USB5534B
> [3] http://www.shimafuji.co.jp/wp/wp-content/uploads/2018/08/SBEV-RCAR-KF-M06Board_HWSpecificationEN_Rev130.pdf
> [4] https://devicehunt.com/search/type/usb/vendor/0424/device/any
> 
> Fixes: 1208f9e1d758c9 ("USB: hub: Fix the broken detection of USB3 device in SMSC hub")
> Cc: stable@...r.kernel.org # v4.14+
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Hardik Gajjar <hgajjar@...adit-jv.com>
> Cc: linux-renesas-soc@...r.kernel.org
> Cc: linux-usb@...r.kernel.org
> Reported-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>

Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

> ---
> drivers/usb/core/hub.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 2b6565c06c23..fc748c731832 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -39,6 +39,7 @@
> 
> #define USB_VENDOR_GENESYS_LOGIC		0x05e3
> #define USB_VENDOR_SMSC				0x0424
> +#define USB_PRODUCT_USB5534B			0x5534
> #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND	0x01
> #define HUB_QUIRK_DISABLE_AUTOSUSPEND		0x02
> 
> @@ -5621,8 +5622,11 @@ static void hub_event(struct work_struct *work)
> }
> 
> static const struct usb_device_id hub_id_table[] = {
> -    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_INT_CLASS,
> +    { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
> +                   | USB_DEVICE_ID_MATCH_PRODUCT
> +                   | USB_DEVICE_ID_MATCH_INT_CLASS,
>       .idVendor = USB_VENDOR_SMSC,
> +      .idProduct = USB_PRODUCT_USB5534B,
>       .bInterfaceClass = USB_CLASS_HUB,
>       .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND},
>     { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
> -- 
> 2.26.2
>