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From:   Wesley Cheng <wcheng@codeaurora.org>
To:     gregkh@linuxfoundation.org, robh+dt@kernel.org, agross@kernel.org,
        bjorn.andersson@linaro.org, balbi@kernel.org
Cc:     linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        jackp@codeaurora.org, fntoth@gmail.com,
        Wesley Cheng <wcheng@codeaurora.org>
Subject: [PATCH v11 4/5] usb: dwc3: dwc3-qcom: Enable tx-fifo-resize property by default
Date:   Wed, 30 Jun 2021 02:00:41 -0700
Message-Id: <1625043642-29822-5-git-send-email-wcheng@codeaurora.org>
In-Reply-To: <1625043642-29822-1-git-send-email-wcheng@codeaurora.org>
References: <1625043642-29822-1-git-send-email-wcheng@codeaurora.org>
Precedence: bulk

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@codeaurora.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 49e6ca9..cec4f4a 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -640,6 +640,25 @@ static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
 	return ret;
 }
 
+#ifdef CONFIG_OF
+static void dwc3_qcom_add_dt_props(struct device *dev, struct device_node *np)
+{
+	struct property		*prop;
+	int ret;
+
+	prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
+	if (prop) {
+		prop->name = "tx-fifo-resize";
+		ret = of_add_property(np, prop);
+		if (ret < 0)
+			dev_info(dev, "unable to add tx-fifo-resize prop\n");
+	}
+}
+#else
+static void dwc3_qcom_add_dt_props(struct device *dev, struct device_node *np)
+{ }
+#endif
+
 static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 {
 	struct dwc3_qcom	*qcom = platform_get_drvdata(pdev);
@@ -653,6 +672,8 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	dwc3_qcom_add_dt_props(dev, dwc3_np);
+
 	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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