linux-kernel - [PATCH 1/2] dt-bindings: usb: snps,dwc3: Add 'snps,enable_guctl1_resume

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Date:   Mon, 13 Jun 2022 18:17:02 +0530
From:   Piyush Mehta <piyush.mehta@...inx.com>
To:     <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <balbi@...nel.org>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <michal.simek@...inx.com>
CC:     <git@...inx.com>, <sivadur@...inx.com>,
        Piyush Mehta <piyush.mehta@...inx.com>
Subject: [PATCH 1/2] dt-bindings: usb: snps,dwc3: Add 'snps,enable_guctl1_resume_quirk' quirk

Add a new DT quirk to dwc3 core to resolved issue of CRC failed error.
On the resume path, U3/U2 exit controller fails to send proper CRC
checksum in CRC5 field. As result Transaction Error is generated.
Enabling bit 10 of GUCTL1 will correct this problem.

When this bit is set to '1', the UTMI/ULPI opmode will be changed to
"normal" along with HS terminations after EOR.
This option is to support certain legacy UTMI/ULPI PHYs.

Signed-off-by: Piyush Mehta <piyush.mehta@...inx.com>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index d41265ba8ce2..36fa87df57a9 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -234,6 +234,12 @@ properties:
       avoid -EPROTO errors with usbhid on some devices (Hikey 970).
     type: boolean
 
+  snps,enable_guctl1_resume_quirk:
+    description:
+      Set if we enable quirk for fixing improper crc generation after resume
+      from suspend.
+    type: boolean
+
   snps,is-utmi-l1-suspend:
     description:
       True when DWC3 asserts output signal utmi_l1_suspend_n, false when
-- 
2.17.1