diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/isp1760-hcd.c | 106 |
1 files changed, 37 insertions, 69 deletions
diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c index 0f5b4894673..fd718ff6afa 100644 --- a/drivers/usb/host/isp1760-hcd.c +++ b/drivers/usb/host/isp1760-hcd.c @@ -97,9 +97,6 @@ struct isp1760_qh { /* first part defined by EHCI spec */ struct list_head qtd_list; - /* periodic schedule info */ - unsigned short period; /* polling interval */ - u32 toggle; u32 ping; }; @@ -673,60 +670,51 @@ static void transform_into_atl(struct isp1760_qh *qh, static void transform_add_int(struct isp1760_qh *qh, struct isp1760_qtd *qtd, struct ptd *ptd) { - u32 maxpacket; - u32 multi; - u32 numberofusofs; - u32 i; - u32 usofmask, usof; + u32 usof; u32 period; - maxpacket = usb_maxpacket(qtd->urb->dev, qtd->urb->pipe, - usb_pipeout(qtd->urb->pipe)); - multi = 1 + ((maxpacket >> 11) & 0x3); - maxpacket &= 0x7ff; - /* length of the data per uframe */ - maxpacket = multi * maxpacket; - - numberofusofs = qtd->urb->transfer_buffer_length / maxpacket; - if (qtd->urb->transfer_buffer_length % maxpacket) - numberofusofs += 1; - - usofmask = 1; - usof = 0; - for (i = 0; i < numberofusofs; i++) { - usof |= usofmask; - usofmask <<= 1; - } - - if (qtd->urb->dev->speed != USB_SPEED_HIGH) { - /* split */ - ptd->dw5 = 0x1c; + /* + * Most of this is guessing. ISP1761 datasheet is quite unclear, and + * the algorithm from the original Philips driver code, which was + * pretty much used in this driver before as well, is quite horrendous + * and, i believe, incorrect. The code below follows the datasheet and + * USB2.0 spec as far as I can tell, and plug/unplug seems to be much + * more reliable this way (fingers crossed...). + */ - if (qh->period >= 32) - period = qh->period / 2; + if (qtd->urb->dev->speed == USB_SPEED_HIGH) { + /* urb->interval is in units of microframes (1/8 ms) */ + period = qtd->urb->interval >> 3; + + if (qtd->urb->interval > 4) + usof = 0x01; /* One bit set => + interval 1 ms * uFrame-match */ + else if (qtd->urb->interval > 2) + usof = 0x22; /* Two bits set => interval 1/2 ms */ + else if (qtd->urb->interval > 1) + usof = 0x55; /* Four bits set => interval 1/4 ms */ else - period = qh->period; - + usof = 0xff; /* All bits set => interval 1/8 ms */ } else { + /* urb->interval is in units of frames (1 ms) */ + period = qtd->urb->interval; + usof = 0x0f; /* Execute Start Split on any of the + four first uFrames */ - if (qh->period >= 8) - period = qh->period/8; - else - period = qh->period; - - if (period >= 32) - period = 16; - - if (qh->period >= 8) { - /* millisecond period */ - period = (period << 3); - } else { - /* usof based tranmsfers */ - /* minimum 4 usofs */ - usof = 0x11; - } + /* + * First 8 bits in dw5 is uSCS and "specifies which uSOF the + * complete split needs to be sent. Valid only for IN." Also, + * "All bits can be set to one for every transfer." (p 82, + * ISP1761 data sheet.) 0x1c is from Philips driver. Where did + * that number come from? 0xff seems to work fine... + */ + /* ptd->dw5 = 0x1c; */ + ptd->dw5 = 0xff; /* Execute Complete Split on any uFrame */ } + period = period >> 1;/* Ensure equal or shorter period than requested */ + period &= 0xf8; /* Mask off too large values and lowest unused 3 bits */ + ptd->dw2 |= period; ptd->dw4 = usof; } @@ -1328,26 +1316,6 @@ static struct isp1760_qh *qh_make(struct usb_hcd *hcd, struct urb *urb, is_input = usb_pipein(urb->pipe); type = usb_pipetype(urb->pipe); - if (type == PIPE_INTERRUPT) { - - if (urb->dev->speed == USB_SPEED_HIGH) { - - qh->period = urb->interval >> 3; - if (qh->period == 0 && urb->interval != 1) { - /* NOTE interval 2 or 4 uframes could work. - * But interval 1 scheduling is simpler, and - * includes high bandwidth. - */ - dev_err(hcd->self.controller, "intr period %d uframes, NYET!", - urb->interval); - qh_destroy(qh); - return NULL; - } - } else { - qh->period = urb->interval; - } - } - if (!usb_pipecontrol(urb->pipe)) usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1); |