linux-kernel - Re: [PATCH v2 1/2] usb: dwc3: host: Set XHCI_SG_TRB_CACHE_SIZE

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Message-ID: <2023121518-uncharted-riddance-7c58@gregkh>
Date: Fri, 15 Dec 2023 13:42:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Prashanth K <quic_prashk@...cinc.com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Mathias Nyman <mathias.nyman@...el.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] usb: dwc3: host: Set XHCI_SG_TRB_CACHE_SIZE_QUIRK

On Tue, Dec 12, 2023 at 04:55:20PM +0530, Prashanth K wrote:
> Upstream commit bac1ec551434 ("usb: xhci: Set quirk for
> XHCI_SG_TRB_CACHE_SIZE_QUIRK") introduced a new quirk in XHCI
> which fixes XHC timeout, which was seen on synopsys XHCs while
> using SG buffers. But the support for this quirk isn't present
> in the DWC3 layer.
> 
> We will encounter this XHCI timeout/hung issue if we run iperf
> loopback tests using RTL8156 ethernet adaptor on DWC3 targets
> with scatter-gather enabled. This gets resolved after enabling
> the XHCI_SG_TRB_CACHE_SIZE_QUIRK. This patch enables it using
> the xhci device property since its needed for DWC3 controller.
> 
> In Synopsys DWC3 databook,
> Table 9-3: xHCI Debug Capability Limitations
> Chained TRBs greater than TRB cache size: The debug capability
> driver must not create a multi-TRB TD that describes smaller
> than a 1K packet that spreads across 8 or more TRBs on either
> the IN TR or the OUT TR.
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Prashanth K <quic_prashk@...cinc.com>

What commit id does this fix?


> ---
>  drivers/usb/dwc3/host.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index 61f57fe5bb78..31a496233d87 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -89,6 +89,8 @@ int dwc3_host_init(struct dwc3 *dwc)
>  
>  	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
>  
> +	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");

And this is ok if the entry is not present?

thanks,

greg k-h