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USB: musb: use right poll limit for low speed devices

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Remove wrongly applied upper limit on the interrupt transfer
interval for low speed devices (not much of an error per se,
according to USB specs).

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sergei Shtylyov 2009-02-21 15:31:35 -08:00 committed by Greg Kroah-Hartman
parent 3ecdb9acf3
commit 136733d612
1 changed files with 10 additions and 8 deletions
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18
drivers/usb/musb/musb_host.c
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@ -1863,19 +1863,21 @@ static int musb_urb_enqueue(
}
qh->type_reg = type_reg;
/* precompute rxinterval/txinterval register */
interval = min((u8)16, epd->bInterval); /* log encoding */
/* Precompute RXINTERVAL/TXINTERVAL register */
switch (qh->type) {
case USB_ENDPOINT_XFER_INT:
/* fullspeed uses linear encoding */
if (USB_SPEED_FULL == urb->dev->speed) {
interval = epd->bInterval;
if (!interval)
interval = 1;
/*
* Full/low speeds use the linear encoding,
* high speed uses the logarithmic encoding.
*/
if (urb->dev->speed <= USB_SPEED_FULL) {
interval = max_t(u8, epd->bInterval, 1);
break;
}
/* FALLTHROUGH */
case USB_ENDPOINT_XFER_ISOC:
/* iso always uses log encoding */
/* ISO always uses logarithmic encoding */
interval = min_t(u8, epd->bInterval, 16);
break;
default:
/* REVISIT we actually want to use NAK limits, hinting to the