On Tue, Apr 21, 2020 at 03:18:09PM +0530, Tejas Joglekar wrote: > This commit adds the documentation for sgl-trb-cache-size-quirk, and > snps,sgl-trb-cache-size-quirk 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 <joglekar@xxxxxxxxxxxx> > --- > Changes in v2: > - Renamed the property > > Documentation/devicetree/bindings/usb/dwc3.txt | 4 ++++ > Documentation/devicetree/bindings/usb/usb-xhci.txt | 3 +++ > 2 files changed, 7 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt > index 9946ff9ba735..6d0418ee4dbd 100644 > --- a/Documentation/devicetree/bindings/usb/dwc3.txt > +++ b/Documentation/devicetree/bindings/usb/dwc3.txt > @@ -104,6 +104,10 @@ 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,sgl-trb-cache-size-quirk: 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..14d900474894 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 > + - sgl-trb-cache-size-quirk: set 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. Why do we have 2 different names? > > additionally the properties from usb-hcd.yaml (in the current directory) are > supported. > -- > 2.11.0 >
