From: Keith Packard <keithp@keithp.com>
Date: Tue, 8 May 2012 04:49:24 +0000 (-0700)
Subject: altos: stm: delay during USB config with pull-up off
X-Git-Tag: 1.0.9.5~25^2~5
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=dd7699cf8daded17ac41abf5c5170cfb599b6ff5

altos: stm: delay during USB config with pull-up off

This makes sure that a reboot will reliably cause the device to
disconnect from the USB bus.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/src/stm/ao_usb_stm.c b/src/stm/ao_usb_stm.c
index 71bf1bc7..c093f526 100644
--- a/src/stm/ao_usb_stm.c
+++ b/src/stm/ao_usb_stm.c
@@ -937,7 +937,7 @@ ao_usb_disable(void)
 void
 ao_usb_enable(void)
 {
-	uint16_t	tick;
+	int	t;
 
 	/* Enable SYSCFG */
 	stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGEN);
@@ -985,6 +985,8 @@ ao_usb_enable(void)
 			(0 << STM_USB_CNTR_PDWN) |
 			(0 << STM_USB_CNTR_FRES));
 
+	for (t = 0; t < 1000; t++)
+		ao_arch_nop();
 	/* Enable USB pull-up */
 	stm_syscfg.pmc |= (1 << STM_SYSCFG_PMC_USB_PU);
 }