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console: usb: kbd: To improve TFTP booting performance

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TFTP booting is slow when a USB keyboard is installed and
stdin has usbkbd added.
This fix is to change Ctrl-C polling for USB keyboard to every second
when NET transfer is running.

Signed-off-by: Jim Lin <jilin@nvidia.com>
This commit is contained in:
Jim Lin 2013-08-13 19:04:22 +08:00 committed by Marek Vasut
parent b63056d6a4
commit 07551f2343
1 changed files with 15 additions and 0 deletions
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15
common/usb_kbd.c
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@ -104,6 +104,11 @@ struct usb_kbd_pdata {
uint8_t flags;
};
extern int __maybe_unused net_busy_flag;
/* The period of time between two calls of usb_kbd_testc(). */
static unsigned long __maybe_unused kbd_testc_tms;
/* Generic keyboard event polling. */
void usb_kbd_generic_poll(void)
{
@ -365,6 +370,16 @@ static int usb_kbd_getc(void)
struct usb_device *usb_kbd_dev;
struct usb_kbd_pdata *data;
#ifdef CONFIG_CMD_NET
/*
* If net_busy_flag is 1, NET transfer is running,
* then we check key-pressed every second (first check may be
* less than 1 second) to improve TFTP booting performance.
*/
if (net_busy_flag && (get_timer(kbd_testc_tms) < CONFIG_SYS_HZ))
return 0;
kbd_testc_tms = get_timer(0);
#endif
dev = stdio_get_by_name(DEVNAME);
usb_kbd_dev = (struct usb_device *)dev->priv;
data = usb_kbd_dev->privptr;