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usb: kbd: Fix key repeat not always working

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The usb-kbd key repeat code assumes that reports get repeated every 40 ms,
this is never true when using CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP, and
does not always works for CONFIG_SYS_USB_EVENT_POLL and
CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE since not all usb keyboards honor
the usb_set_idle() command.

For CONFIG_SYS_USB_EVENT_POLL we must use usb_set_idle() since we do a
blocking wait for the hid report, so if we do not tell the keyboard to send
a hid report every 40ms even if nothing changes then we will block u-boot
for 1s (the default u-boot usb interrupt packet timeout). Note that in this
case on keyboards which do not support usb_set_idle() we loose and we actually
get 1s latencies on other u-boot activities.

For the other poll-methods this commit stops using usb_set_idle() and instead
repeats the last received hid-report every 40 ms as long as no new hid-report
is received. This fixes key-repeat not working at all with
CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP and fixes it not working with
keyboards which do not implement usb_set_idle() when using
CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2015-05-19 22:51:03 +02:00 committed by Marek Vasut
parent 5cfd6c002a
commit 8454c84af5
1 changed files with 20 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
common/usb_kbd.c
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@ -31,7 +31,7 @@ int overwrite_console(void)
#endif
/* Keyboard sampling rate */
#define REPEAT_RATE (40 / 4) /* 40msec -> 25cps */
#define REPEAT_RATE 40 /* 40msec -> 25cps */
#define REPEAT_DELAY 10 /* 10 x REPEAT_RATE = 400msec */
#define NUM_LOCK 0x53
@ -103,6 +103,7 @@ struct usb_kbd_pdata {
unsigned long intpipe;
int intpktsize;
int intinterval;
unsigned long last_report;
struct int_queue *intq;
uint32_t repeat_delay;
@ -310,7 +311,7 @@ static int usb_kbd_irq(struct usb_device *dev)
/* Interrupt polling */
static inline void usb_kbd_poll_for_event(struct usb_device *dev)
{
#if defined(CONFIG_SYS_USB_EVENT_POLL)
#if defined(CONFIG_SYS_USB_EVENT_POLL)
struct usb_kbd_pdata *data = dev->privptr;
/* Submit a interrupt transfer request */
@ -318,15 +319,17 @@ static inline void usb_kbd_poll_for_event(struct usb_device *dev)
data->intinterval);
usb_kbd_irq_worker(dev);
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) || \
defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
#if defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP)
struct usb_interface *iface;
struct usb_kbd_pdata *data = dev->privptr;
iface = &dev->config.if_desc[0];
usb_get_report(dev, iface->desc.bInterfaceNumber,
1, 0, data->new, USB_KBD_BOOT_REPORT_SIZE);
if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE))
if (memcmp(data->old, data->new, USB_KBD_BOOT_REPORT_SIZE)) {
usb_kbd_irq_worker(dev);
#elif defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
#else
struct usb_kbd_pdata *data = dev->privptr;
if (poll_int_queue(dev, data->intq)) {
usb_kbd_irq_worker(dev);
@ -335,6 +338,13 @@ static inline void usb_kbd_poll_for_event(struct usb_device *dev)
data->intq = create_int_queue(dev, data->intpipe, 1,
USB_KBD_BOOT_REPORT_SIZE, data->new,
data->intinterval);
#endif
data->last_report = get_timer(0);
/* Repeat last usb hid report every REPEAT_RATE ms for keyrepeat */
} else if (data->last_report != -1 &&
get_timer(data->last_report) > REPEAT_RATE) {
usb_kbd_irq_worker(dev);
data->last_report = get_timer(0);
}
#endif
}
@ -445,12 +455,16 @@ static int usb_kbd_probe(struct usb_device *dev, unsigned int ifnum)
data->intpktsize = min(usb_maxpacket(dev, data->intpipe),
USB_KBD_BOOT_REPORT_SIZE);
data->intinterval = ep->bInterval;
data->last_report = -1;
/* We found a USB Keyboard, install it. */
usb_set_protocol(dev, iface->desc.bInterfaceNumber, 0);
#if !defined(CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP) && \
!defined(CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE)
debug("USB KBD: found set idle...\n");
usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE, 0);
usb_set_idle(dev, iface->desc.bInterfaceNumber, REPEAT_RATE / 4, 0);
#endif
debug("USB KBD: enable interrupt pipe...\n");
#ifdef CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE