FROMGIT: usb: dwc3: host: Set XHCI_SG_TRB_CACHE_SIZE_QUIRK
Upstream commit bac1ec55 ("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> Bug: 322910830 (cherry picked from commit 817349b6 https: //git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/ usb-linus) Signed-off-by:
Prashanth K <quic_prashk@quicinc.com> Change-Id: I9a5bf2c4d43551406d452927084576387656953d
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