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staging: octeon-usb: move isoc transfer handling into separate function 

Move isochronous transfer handling into a separate function to
avoid deep indentation.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aaro Koskinen 2016-02-26 02:14:03 +02:00 committed by Greg Kroah-Hartman
parent dfce62674c
commit dd588994fa
1 changed files with 53 additions and 53 deletions
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106
drivers/staging/octeon-usb/octeon-hcd.c
View File

@ -2526,6 +2526,55 @@ static void cvmx_usb_transfer_intr(struct octeon_hcd *usb,
}
}
static void cvmx_usb_transfer_isoc(struct octeon_hcd *usb,
struct cvmx_usb_pipe *pipe,
struct cvmx_usb_transaction *transaction,
int buffer_space_left,
int bytes_in_last_packet,
int bytes_this_transfer)
{
if (cvmx_usb_pipe_needs_split(usb, pipe)) {
/*
* ISOCHRONOUS OUT splits don't require a complete split stage.
* Instead they use a sequence of begin OUT splits to transfer
* the data 188 bytes at a time. Once the transfer is complete,
* the pipe sleeps until the next schedule interval.
*/
if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
/*
* If no space left or this wasn't a max size packet
* then this transfer is complete. Otherwise start it
* again to send the next 188 bytes
*/
if (!buffer_space_left || (bytes_this_transfer < 188)) {
pipe->next_tx_frame += pipe->interval;
cvmx_usb_complete(usb, pipe, transaction,
CVMX_USB_STATUS_OK);
}
return;
}
if (transaction->stage ==
CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE) {
/*
* We are in the incoming data phase. Keep getting data
* until we run out of space or get a small packet
*/
if ((buffer_space_left == 0) ||
(bytes_in_last_packet < pipe->max_packet)) {
pipe->next_tx_frame += pipe->interval;
cvmx_usb_complete(usb, pipe, transaction,
CVMX_USB_STATUS_OK);
}
} else {
transaction->stage =
CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
}
} else {
pipe->next_tx_frame += pipe->interval;
cvmx_usb_complete(usb, pipe, transaction, CVMX_USB_STATUS_OK);
}
}
/**
* Poll a channel for status
*
@ -2815,59 +2864,10 @@ static int cvmx_usb_poll_channel(struct octeon_hcd *usb, int channel)
bytes_in_last_packet);
break;
case CVMX_USB_TRANSFER_ISOCHRONOUS:
if (cvmx_usb_pipe_needs_split(usb, pipe)) {
/*
* ISOCHRONOUS OUT splits don't require a
* complete split stage. Instead they use a
* sequence of begin OUT splits to transfer the
* data 188 bytes at a time. Once the transfer
* is complete, the pipe sleeps until the next
* schedule interval
*/
if (pipe->transfer_dir ==
CVMX_USB_DIRECTION_OUT) {
/*
* If no space left or this wasn't a max
* size packet then this transfer is
* complete. Otherwise start it again to
* send the next 188 bytes
*/
if (!buffer_space_left ||
(bytes_this_transfer < 188)) {
pipe->next_tx_frame +=
pipe->interval;
cvmx_usb_complete(usb, pipe,
transaction,
CVMX_USB_STATUS_OK);
}
} else {
if (transaction->stage ==
CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE) {
/*
* We are in the incoming data
* phase. Keep getting data
* until we run out of space or
* get a small packet
*/
if ((buffer_space_left == 0) ||
(bytes_in_last_packet <
pipe->max_packet)) {
pipe->next_tx_frame +=
pipe->interval;
cvmx_usb_complete(usb,
pipe,
transaction,
CVMX_USB_STATUS_OK);
}
} else
transaction->stage =
CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
}
} else {
pipe->next_tx_frame += pipe->interval;
cvmx_usb_complete(usb, pipe, transaction,
CVMX_USB_STATUS_OK);
}
cvmx_usb_transfer_isoc(usb, pipe, transaction,
buffer_space_left,
bytes_in_last_packet,
bytes_this_transfer);
break;
}
} else if (usbc_hcint.s.nak) {