For Gen1 isoc-in endpoint on controller before about SSUSB IPM v1.6.0, it
still send out unexpected ACK after receiving a short packet in burst
transfer, this will cause an exception on connected device, specially for
a 4k camera.
Add a quirk property "mediatek,rxfifo-depth" to work around this hardware
issue;
The side-effect is that may cause performance drop about 10%, including
bulk transfer.
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
---
.../devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
index e9644e333d78..b8ed68574ba4 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
@@ -124,6 +124,16 @@ properties:
defined in the xHCI spec on MTK's controller.
default: 5000
+ mediatek,rxfifo-depth:
+ description:
+ It is a quirk flag used to work around Gen1 isoc-in endpoint transfer
+ issue that still send out unexpected ACK after device finish the burst
+ transfer with a short packet and cause an exception, specially on a 4K
+ camera device, it happens on controller before about IPM v1.6.0; the
+ side-effect is that may cause performance drop about 10%, include bulk
+ transfer.
+ type: boolean
+
# the following properties are only used for case 1
wakeup-source:
description: enable USB remote wakeup, see power/wakeup-source.txt
--
2.25.1
