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From: Wesley Cheng <>
	Wesley Cheng <>
Subject: [PATCH v12 6/6] dt-bindings: usb: dwc3: Update dwc3 TX fifo properties
Date: Fri,  2 Jul 2021 02:37:35 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Update the tx-fifo-resize property with a better description, while
adding the tx-fifo-max-num, which is a new parameter allowing
adjustments for the maximum number of packets the txfifo resizing logic
can account for while resizing the endpoints.

Reviewed-by: Rob Herring <>
Signed-off-by: Wesley Cheng <>
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 41416fb..078fb78 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -289,10 +289,21 @@ properties:
     maximum: 16
-    description: Determines if the FIFO *has* to be reallocated
-    deprecated: true
+    description: Determines if the TX fifos can be dynamically resized depending
+      on the number of IN endpoints used and if bursting is supported.  This
+      may help improve bandwidth on platforms with higher system latencies, as
+      increased fifo space allows for the controller to prefetch data into its
+      internal memory.
     type: boolean
+  tx-fifo-max-num:
+    description: Specifies the max number of packets the txfifo resizing logic
+      can account for when higher endpoint bursting is used. (bMaxBurst > 6) The
+      higher the number, the more fifo space the txfifo resizing logic will
+      allocate for that endpoint.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 3
       Value for INCR burst type of GSBUSCFG0 register, undefined length INCR
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

  parent reply	other threads:[~2021-07-02  9:38 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-02  9:37 [PATCH v12 0/6] Re-introduce TX FIFO resize for larger EP bursting Wesley Cheng
2021-07-02  9:37 ` [PATCH v12 1/6] usb: gadget: udc: core: Introduce check_config to verify USB configuration Wesley Cheng
2021-07-02  9:37 ` [PATCH v12 2/6] usb: gadget: configfs: Check USB configuration before adding Wesley Cheng
2021-07-02  9:37 ` [PATCH v12 3/6] usb: dwc3: Resize TX FIFOs to meet EP bursting requirements Wesley Cheng
2021-07-06 18:13   ` Greg KH
2021-07-06 20:19     ` Wesley Cheng
2021-07-07  6:36       ` Greg KH
2021-07-02  9:37 ` [PATCH v12 4/6] of: Add stub for of_add_property() Wesley Cheng
2021-07-02  9:37 ` [PATCH v12 5/6] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default Wesley Cheng
2021-07-02  9:37 ` Wesley Cheng [this message]
2021-07-06 18:14   ` [PATCH v12 6/6] dt-bindings: usb: dwc3: Update dwc3 TX fifo properties Greg KH

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