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Message-ID: <20250314155706.31058-1-mike.looijmans@topic.nl>
Date: Fri, 14 Mar 2025 16:56:07 +0100
From: Mike Looijmans <mike.looijmans@...ic.nl>
To: linux-usb@...r.kernel.org
CC: Mike Looijmans <mike.looijmans@...ic.nl>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Michal Simek <michal.simek@....com>,
Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] usb: dwc3: xilinx: Prevent spike in reset signal
Set the gpio to "high" on acquisition, instead of acquiring it in low
state and then immediately setting it high again. This prevents a
short "spike" on the reset signal.
Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
---
drivers/usb/dwc3/dwc3-xilinx.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c
index a33a42ba0249..a159a511483b 100644
--- a/drivers/usb/dwc3/dwc3-xilinx.c
+++ b/drivers/usb/dwc3/dwc3-xilinx.c
@@ -207,7 +207,7 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
skip_usb3_phy:
/* ulpi reset via gpio-modepin or gpio-framework driver */
- reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(reset_gpio)) {
return dev_err_probe(dev, PTR_ERR(reset_gpio),
"Failed to request reset GPIO\n");
@@ -215,7 +215,6 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
if (reset_gpio) {
/* Toggle ulpi to reset the phy. */
- gpiod_set_value_cansleep(reset_gpio, 1);
usleep_range(5000, 10000);
gpiod_set_value_cansleep(reset_gpio, 0);
usleep_range(5000, 10000);
--
2.43.0
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands
T: +31 (0) 499 33 69 69
E: mike.looijmans@...ic.nl
W: www.topic.nl
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