linux-kernel - [PATCH v2 2/2] usb: dwc3: Refactor dwc3_mode

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Message-ID: <20250822092411.173519-2-khtsai@google.com>
Date: Fri, 22 Aug 2025 17:23:46 +0800
From: Kuen-Han Tsai <khtsai@...gle.com>
To: Thinh.Nguyen@...opsys.com, gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Kuen-Han Tsai <khtsai@...gle.com>
Subject: [PATCH v2 2/2] usb: dwc3: Refactor dwc3_mode_show

Use dwc3_mode_string as the single source of truth for mode-to-string
conversion.

Signed-off-by: Kuen-Han Tsai <khtsai@...gle.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
---
v1 -> v2: Added the Acked-by tag.

 drivers/usb/dwc3/debugfs.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index ebf03468fac4..d18bf5e32cc8 100644
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -402,6 +402,7 @@ static int dwc3_mode_show(struct seq_file *s, void *unused)
 	struct dwc3		*dwc = s->private;
 	unsigned long		flags;
 	u32			reg;
+	u32			mode;
 	int			ret;

 	ret = pm_runtime_resume_and_get(dwc->dev);
@@ -412,18 +413,15 @@ static int dwc3_mode_show(struct seq_file *s, void *unused)
 	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 	spin_unlock_irqrestore(&dwc->lock, flags);

-	switch (DWC3_GCTL_PRTCAP(reg)) {
+	mode = DWC3_GCTL_PRTCAP(reg);
+	switch (mode) {
 	case DWC3_GCTL_PRTCAP_HOST:
-		seq_puts(s, "host\n");
-		break;
 	case DWC3_GCTL_PRTCAP_DEVICE:
-		seq_puts(s, "device\n");
-		break;
 	case DWC3_GCTL_PRTCAP_OTG:
-		seq_puts(s, "otg\n");
+		seq_printf(s, "%s\n", dwc3_mode_string(mode));
 		break;
 	default:
-		seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
+		seq_printf(s, "UNKNOWN %08x\n", mode);
 	}

 	pm_runtime_put_sync(dwc->dev);
--
2.51.0.261.g7ce5a0a67e-goog