usb: dwc3: host: Set XHCI_SG_TRB_CACHE_SIZE_QUIRK

commit 817349b6d26aadd8b38283a05ce0bab106b4c765 upstream.

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@vger.kernel.org #5.11
Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20240116055816.1169821-2-quic_prashk@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index 2078e9d702923c731f69876776bdae6bafe50a92..012b54cb847feef4972bb7ee5416a0f7aff58b26 100644 (file)
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -44,7 +44,7 @@ out:
 
 int dwc3_host_init(struct dwc3 *dwc)
 {
-       struct property_entry   props[4];
+       struct property_entry   props[5];
        struct platform_device  *xhci;
        int                     ret, irq;
        struct resource         *res;
@@ -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");
+
        if (dwc->usb3_lpm_capable)
                props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");