From 397f519a0d771a6bddbcd71a31da6880e81c2e6b Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Fri, 27 Jun 2008 19:09:58 +0900 Subject: [PATCH] usb: r8a66597-hcd: fix iinterval for Full/Low speed device fix interrupt transfer interval for Full/Low speed device. Signed-off-by: Yoshihiro Shimoda Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/r8a66597-hcd.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c index 4db0107f3178..d5f02dddb120 100644 --- a/drivers/usb/host/r8a66597-hcd.c +++ b/drivers/usb/host/r8a66597-hcd.c @@ -863,6 +863,32 @@ static void disable_r8a66597_pipe_all(struct r8a66597 *r8a66597, dev->dma_map = 0; } +static u16 get_interval(struct urb *urb, __u8 interval) +{ + u16 time = 1; + int i; + + if (urb->dev->speed == USB_SPEED_HIGH) { + if (interval > IITV) + time = IITV; + else + time = interval ? interval - 1 : 0; + } else { + if (interval > 128) { + time = IITV; + } else { + /* calculate the nearest value for PIPEPERI */ + for (i = 0; i < 7; i++) { + if ((1 << i) < interval && + (1 << (i + 1) > interval)) + time = 1 << i; + } + } + } + + return time; +} + static unsigned long get_timer_interval(struct urb *urb, __u8 interval) { __u8 i; @@ -901,10 +927,7 @@ static void init_pipe_info(struct r8a66597 *r8a66597, struct urb *urb, info.interval = 0; info.timer_interval = 0; } else { - if (ep->bInterval > IITV) - info.interval = IITV; - else - info.interval = ep->bInterval ? ep->bInterval - 1 : 0; + info.interval = get_interval(urb, ep->bInterval); info.timer_interval = get_timer_interval(urb, ep->bInterval); } if (ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) -- 2.20.1