mail archive of the barebox mailing list
 help / color / mirror / Atom feed
* [PATCH 3/7] AT91 UDC startup fix
@ 2013-03-12 15:54 Renaud C.
  2013-03-13 10:29 ` Cerrato Renaud
  0 siblings, 1 reply; 2+ messages in thread
From: Renaud C. @ 2013-03-12 15:54 UTC (permalink / raw)
  To: barebox


[-- Attachment #1.1: Type: text/plain, Size: 293 bytes --]

I noticed that depending on boot timings, the USB gadget weren't detected
at all by hosts. After few hours of debugging and using the at91clk output,
I found that the UDP clock wasn't enabled from time to time.

This patch fix the startup of UDC by adding a check into the
at91_update_vbus().

[-- Attachment #1.2: Type: text/html, Size: 382 bytes --]

[-- Attachment #2: at91udc-initial-vbus-detection.patch --]
[-- Type: application/octet-stream, Size: 1434 bytes --]

From 0cd745d451109522891194b954982710c6bd736d Mon Sep 17 00:00:00 2001
From: Cerrato Renaud <r.cerrato@til-technologies.fr>
Date: Thu, 7 Mar 2013 09:02:55 +0100
Subject: [PATCH 4/4] corrected initial vbus detection

---
 drivers/usb/gadget/at91_udc.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 3899db2..0654038 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -1327,6 +1327,12 @@ static void at91_update_vbus(struct at91_udc *udc, u32 value)
 		dev_set_param(udc->dev, "vbus", "0");
 
 	udc->gpio_vbus_val = value;
+	udc->vbus = value != 0;
+
+	if(udc->driver)
+		pullup(udc, udc->vbus);
+	else
+		pullup(udc, 0);
 }
 
 int usb_gadget_poll(void)
@@ -1508,7 +1514,7 @@ static int __init at91udc_probe(struct device_d *dev)
 		 * Get the initial state of VBUS - we cannot expect
 		 * a pending interrupt.
 		 */
-		udc->vbus = gpio_get_value(udc->board.vbus_pin);
+		udc->vbus = gpio_get_value(udc->board.vbus_pin) ^ udc->board.vbus_active_low;
 		DBG(udc, "VBUS detection: host:%s \n",
 			udc->vbus ? "present":"absent");
 	} else {
@@ -1517,7 +1523,7 @@ static int __init at91udc_probe(struct device_d *dev)
 	}
 
 	dev_add_param(dev, "vbus", NULL, NULL, 0);
-	dev_set_param(dev, "vbus", "0");
+	dev_set_param(dev, "vbus", udc->vbus ? "1" : "0");
 
 	poller_register(&poller);
 
-- 
1.7.2.5


[-- Attachment #3: Type: text/plain, Size: 149 bytes --]

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2013-03-13 10:28 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-03-12 15:54 [PATCH 3/7] AT91 UDC startup fix Renaud C.
2013-03-13 10:29 ` Cerrato Renaud

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox