Hello Thomas,
I just debugging some usb issues on an dm365 based board. I noticed
that if no usb device is connected to the board, the "usb start"
command does have a long timeout (also have access to an dm365evm
board, same behaviour). Found the reason for this big timeout here:
./drivers/usb/musb/musb_hcd.c usb_lowlevel_init():
timeout = musb_cfg.timeout;
while (timeout--)
if (readb(&musbr->devctl) & MUSB_DEVCTL_HM)
break;
with ./drivers/usb/musb/davinci.:
/* MUSB platform configuration */
struct musb_config musb_cfg = {
.regs = (struct musb_regs *)MENTOR_USB0_BASE,
.timeout = DAVINCI_USB_TIMEOUT,
.musb_speed = 0,
};
and ./drivers/usb/musb/davinci.h:
#define DAVINCI_USB_TIMEOUT 0x3FFFFFF
Why is this DAVINCI_USB_TIMEOUT value so high? This could be shorter,
or are there some reasons for such a long timeout?
Thanks!
bye,
Heiko
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