linux-kernel - [PATCH v4, 1/3] dt-bindings: usb: dwc3: Add snps,p2p3tranok quirk

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Date: Wed, 12 Jun 2024 23:23:47 +0800
From: joswang <joswang1221@...il.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: Thinh.Nguyen@...opsys.com,
	gregkh@...uxfoundation.org,
	balbi@...nel.org,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jos Wang <joswang@...ovo.com>
Subject: [PATCH v4, 1/3] dt-bindings: usb: dwc3: Add snps,p2p3tranok quirk

From: Jos Wang <joswang@...ovo.com>

There is an issue with the DWC31 2.00a and earlier versions
where the controller link power state transition from
P3/P3CPM/P4 to P2 may take longer than expected, ultimately
resulting in the hibernation D3 entering time exceeding the
expected 10ms.

Add a new 'snps,p2p3tranok-quirk' DT quirk to dwc3 core
for enable the controller transitions directly from phy
power state P2 to P3 or from state P3 to P2.

Note that this can only be set if the USB3 PHY supports
direct p3 to p2 or p2 to p3 conversion.

Signed-off-by: Jos Wang <joswang@...ovo.com>
---
v1 -> v2:
- v1 did not add this PATCH
v2 -> v3:
- modify Author Jos Wang
v3 -> v4:
- no change
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 1cd0ca90127d..721927495887 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -242,6 +242,13 @@ properties:
       When set, all HighSpeed bus instances in park mode are disabled.
     type: boolean
 
+  snps,p2p3tranok-quirk:
+    description:
+      When set, the controller transitions directly from phy power state
+      P2 to P3 or from state P3 to P2. Note that this can only be set
+      if the USB3 PHY supports direct p3 to p2 or p2 to p3 conversion.
+    type: boolean
+
   snps,dis_metastability_quirk:
     description:
       When set, disable metastability workaround. CAUTION! Use only if you are
-- 
2.17.1