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Commit 48f80609 authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Felipe Balbi
Browse files

usb: dwc3: Make TX/RX threshold configurable 



DWC_usb31 periodic transfer at 48K+ bytes per interval may need
modification to the TX/RX packet threshold to achieve optimal result.
Add properties to make it configurable.

By default, periodic ESS TX and RX threshold are not enabled. To enable
TX or RX threshold (host mode only), both packet threshold count and max
burst size properties must be set to a valid non-zero value 1-16.

DWC_usb31 programming guide section 1.2.3 and 1.2.4.

Cc: John Youn <johnyoun@synopsys.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 6743e817

Documentation/devicetree/bindings/usb/dwc3.txt

+16 −0
Original line number Diff line number Diff line
@@ -57,6 +57,22 @@ Optional properties: 
 - snps,quirk-frame-length-adjustment: Value for GFLADJ_30MHZ field of GFLADJ

	register for post-silicon frame length adjustment when the

	fladj_30mhz_sdbnd signal is invalid or incorrect.

 - snps,rx-thr-num-pkt-prd: periodic ESS RX packet threshold count - host mode

			only. Set this and rx-max-burst-prd to a valid,

			non-zero value 1-16 (DWC_usb31 programming guide

			section 1.2.4) to enable periodic ESS RX threshold.

 - snps,rx-max-burst-prd: max periodic ESS RX burst size - host mode only. Set

			this and rx-thr-num-pkt-prd to a valid, non-zero value

			1-16 (DWC_usb31 programming guide section 1.2.4) to

			enable periodic ESS RX threshold.

 - snps,tx-thr-num-pkt-prd: periodic ESS TX packet threshold count - host mode

			only. Set this and tx-max-burst-prd to a valid,

			non-zero value 1-16 (DWC_usb31 programming guide

			section 1.2.3) to enable periodic ESS TX threshold.

 - snps,tx-max-burst-prd: max periodic ESS TX burst size - host mode only. Set

			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.



 - <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.