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Prevent a race condition when writing VIC_INT_EN_CLEAR. Should be very difficult to hit in this case though...

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26451 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Tobias Diedrich 2010-06-01 19:29:01 +00:00
parent 47cd8786ba
commit 253cfbcd47
1 changed files with 8 additions and 0 deletions
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8
firmware/target/arm/as3525/usb-drv-as3525.c
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@ -544,6 +544,14 @@ void usb_drv_init(void)
void usb_drv_exit(void)
{
USB_DEV_CTRL |= (1<<10); /* soft disconnect */
/*
* mask all interrupts _before_ writing to VIC_INT_EN_CLEAR,
* or else the core might latch the interrupt while
* the write ot VIC_INT_EN_CLEAR is in the pipeline and
* so cause a fake spurious interrupt.
*/
USB_DEV_EP_INTR_MASK = 0xffffffff;
USB_DEV_INTR_MASK = 0xffffffff;
VIC_INT_EN_CLEAR = INTERRUPT_USB;
CGU_USB &= ~(1<<5);
CGU_PERI &= ~CGU_USB_CLOCK_ENABLE;