linux-kernel - [PATCH v8 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default

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Date:   Wed, 19 May 2021 00:43:57 -0700
From:   Wesley Cheng <wcheng@...eaurora.org>
To:     balbi@...nel.org, gregkh@...uxfoundation.org, agross@...nel.org,
        bjorn.andersson@...aro.org, robh+dt@...nel.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        jackp@...eaurora.org, Thinh.Nguyen@...opsys.com,
        Wesley Cheng <wcheng@...eaurora.org>
Subject: [PATCH v8 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default

In order to take advantage of the TX fifo resizing logic, manually add
these properties to the DWC3 child node by default.  This will allow
the DWC3 gadget to resize the TX fifos for the IN endpoints, which
help with performance.

Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 49e6ca9..44e0eaa1 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -645,6 +645,7 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 	struct dwc3_qcom	*qcom = platform_get_drvdata(pdev);
 	struct device_node	*np = pdev->dev.of_node, *dwc3_np;
 	struct device		*dev = &pdev->dev;
+	struct property		*prop;
 	int			ret;
 
 	dwc3_np = of_get_compatible_child(np, "snps,dwc3");
@@ -653,6 +654,14 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
+	if (prop) {
+		prop->name = "tx-fifo-resize";
+		ret = of_add_property(dwc3_np, prop);
+		if (ret < 0)
+			dev_info(dev, "unable to add tx-fifo-resize prop\n");
+	}
+
 	ret = of_platform_populate(np, NULL, NULL, dev);
 	if (ret) {
 		dev_err(dev, "failed to register dwc3 core - %d\n", ret);
-- 
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