linux-kernel - [PATCH v3 0/2] Set XHCI_SG_TRB_CACHE_SIZE

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Date: Tue, 16 Jan 2024 11:28:14 +0530
From: Prashanth K <quic_prashk@...cinc.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen
	<Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...el.com>
CC: Hans de Goede <hdegoede@...hat.com>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, Prashanth K <quic_prashk@...cinc.com>
Subject: [PATCH v3 0/2] Set XHCI_SG_TRB_CACHE_SIZE_QUIRK for DWC3 devices

XHCI_SG_TRB_CACHE_SIZE_QUIRK was introduced in XHCI to resolve
XHC timeout while using SG buffers, which was seen Synopsys XHCs.
The support for this isn't present in DWC3 layer, this series
enables XHCI_SG_TRB_CACHE_SIZE_QUIRK since this is 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.

More information about this XHCI quirk is mentioned on the
following thread.
https://lore.kernel.org/all/20201208092912.1773650-3-mathias.nyman@linux.intel.com/

Changes in v3:
Updated the props[] array size from 4 to 5 in dwc3/host.c

Changes in v2:
Changed implementation using device property instead of priv_data
Split the single patch into 2 patch series, v1 is mentioned below
https://lore.kernel.org/all/20231121135936.1669167-1-quic_prashk@quicinc.com/

Prashanth K (2):
  usb: host: xhci-plat: Add support for XHCI_SG_TRB_CACHE_SIZE_QUIRK
  usb: dwc3: host: Set XHCI_SG_TRB_CACHE_SIZE_QUIRK

 drivers/usb/dwc3/host.c      | 4 +++-
 drivers/usb/host/xhci-plat.c | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

-- 
2.25.1