[lkml]   [2020]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[RFC PATCH 1/4] dt-bindings: usb: Add snps,consolidate-sgl & consolidate-sgl
This commit adds the documentation for consolidate-sgl, and
snps,consolidate-sgl property. These when set enables the quirk for
XHCI driver for consolidation of sg list into a temporary buffer when small
buffer sizes are scattered over the sg list not making up to MPS or total
transfer size within TRB cache size with Synopsys xHC.

Signed-off-by: Tejas Joglekar <>
Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
Documentation/devicetree/bindings/usb/usb-xhci.txt | 3 +++
2 files changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 9946ff9ba735..292d1f7969e4 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -104,6 +104,9 @@ Optional properties:
this and tx-thr-num-pkt-prd to a valid, non-zero value
1-16 (DWC_usb31 programming guide section 1.2.3) to
enable periodic ESS TX threshold.
+ - snps,consolidate-sgl: enable sg list consolidation - host mode only. Set to use
+ SG buffers of at least MPS size by consolidating smaller SG
+ buffers list into a single buffer.

- <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.
- snps,incr-burst-type-adjustment: Value for INCR burst type of GSBUSCFG0
diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index 3f378951d624..a90d853557ee 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -43,6 +43,9 @@ Optional properties:
- quirk-broken-port-ped: set if the controller has broken port disable mechanism
- imod-interval-ns: default interrupt moderation interval is 5000ns
- phys : see usb-hcd.yaml in the current directory
+ - consolidate-sgl: indicate if you need to consolidate sg list into a
+ temporary buffer when small SG buffer sizes does not make upto MPS
+ size or total transfer size across the TRB cache size.

additionally the properties from usb-hcd.yaml (in the current directory) are
 \ /
  Last update: 2020-03-27 09:36    [W:0.107 / U:1.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site