mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-28 12:25:31 +00:00
usb: dwc2: host: Reorder things in hcd_queue.c
This no-op change just reorders a few functions in hcd_queue.c in order to prepare for future changes. Motivations here: The functions dwc2_hcd_qh_free() and dwc2_hcd_qh_create() are exported functions. They are not called within the file. That means that they should be near the bottom so that they can easily call static helpers. The function dwc2_qh_init() is only called by dwc2_hcd_qh_create() and should move near the bottom with it. The only reason that the dwc2_unreserve_timer_fn() timer function (and its subroutine dwc2_do_unreserve()) were so high in the file was that they needed to be above dwc2_qh_init(). Now that dwc2_qh_init() has been moved down it can be moved down a bit. A later patch will split the reserve code out of dwc2_schedule_periodic() and the reserve function should be near the unreserve function. The reserve function needs to be below dwc2_find_uframe() since it calls that. Acked-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Douglas Anderson
Felipe Balbi
parent
ced9eee122
commit
b951c6c7f8
@ -56,6 +56,194 @@
|
||||
/* Wait this long before releasing periodic reservation */
|
||||
#define DWC2_UNRESERVE_DELAY (msecs_to_jiffies(5))
|
||||
|
||||
/**
|
||||
* dwc2_periodic_channel_available() - Checks that a channel is available for a
|
||||
* periodic transfer
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*/
|
||||
static int dwc2_periodic_channel_available(struct dwc2_hsotg *hsotg)
|
||||
{
|
||||
/*
|
||||
* Currently assuming that there is a dedicated host channel for
|
||||
* each periodic transaction plus at least one host channel for
|
||||
* non-periodic transactions
|
||||
*/
|
||||
int status;
|
||||
int num_channels;
|
||||
|
||||
num_channels = hsotg->core_params->host_channels;
|
||||
if (hsotg->periodic_channels + hsotg->non_periodic_channels <
|
||||
num_channels
|
||||
&& hsotg->periodic_channels < num_channels - 1) {
|
||||
status = 0;
|
||||
} else {
|
||||
dev_dbg(hsotg->dev,
|
||||
"%s: Total channels: %d, Periodic: %d, "
|
||||
"Non-periodic: %d\n", __func__, num_channels,
|
||||
hsotg->periodic_channels, hsotg->non_periodic_channels);
|
||||
status = -ENOSPC;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_check_periodic_bandwidth() - Checks that there is sufficient bandwidth
|
||||
* for the specified QH in the periodic schedule
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH containing periodic bandwidth required
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*
|
||||
* For simplicity, this calculation assumes that all the transfers in the
|
||||
* periodic schedule may occur in the same (micro)frame
|
||||
*/
|
||||
static int dwc2_check_periodic_bandwidth(struct dwc2_hsotg *hsotg,
|
||||
struct dwc2_qh *qh)
|
||||
{
|
||||
int status;
|
||||
s16 max_claimed_usecs;
|
||||
|
||||
status = 0;
|
||||
|
||||
if (qh->dev_speed == USB_SPEED_HIGH || qh->do_split) {
|
||||
/*
|
||||
* High speed mode
|
||||
* Max periodic usecs is 80% x 125 usec = 100 usec
|
||||
*/
|
||||
max_claimed_usecs = 100 - qh->host_us;
|
||||
} else {
|
||||
/*
|
||||
* Full speed mode
|
||||
* Max periodic usecs is 90% x 1000 usec = 900 usec
|
||||
*/
|
||||
max_claimed_usecs = 900 - qh->host_us;
|
||||
}
|
||||
|
||||
if (hsotg->periodic_usecs > max_claimed_usecs) {
|
||||
dev_err(hsotg->dev,
|
||||
"%s: already claimed usecs %d, required usecs %d\n",
|
||||
__func__, hsotg->periodic_usecs, qh->host_us);
|
||||
status = -ENOSPC;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* Microframe scheduler
|
||||
* track the total use in hsotg->frame_usecs
|
||||
* keep each qh use in qh->frame_usecs
|
||||
* when surrendering the qh then donate the time back
|
||||
*/
|
||||
static const unsigned short max_uframe_usecs[] = {
|
||||
100, 100, 100, 100, 100, 100, 30, 0
|
||||
};
|
||||
|
||||
void dwc2_hcd_init_usecs(struct dwc2_hsotg *hsotg)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 8; i++)
|
||||
hsotg->frame_usecs[i] = max_uframe_usecs[i];
|
||||
}
|
||||
|
||||
static int dwc2_find_single_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
unsigned short utime = qh->host_us;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
/* At the start hsotg->frame_usecs[i] = max_uframe_usecs[i] */
|
||||
if (utime <= hsotg->frame_usecs[i]) {
|
||||
hsotg->frame_usecs[i] -= utime;
|
||||
qh->frame_usecs[i] += utime;
|
||||
return i;
|
||||
}
|
||||
}
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
/*
|
||||
* use this for FS apps that can span multiple uframes
|
||||
*/
|
||||
static int dwc2_find_multi_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
unsigned short utime = qh->host_us;
|
||||
unsigned short xtime;
|
||||
int t_left;
|
||||
int i;
|
||||
int j;
|
||||
int k;
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
if (hsotg->frame_usecs[i] <= 0)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* we need n consecutive slots so use j as a start slot
|
||||
* j plus j+1 must be enough time (for now)
|
||||
*/
|
||||
xtime = hsotg->frame_usecs[i];
|
||||
for (j = i + 1; j < 8; j++) {
|
||||
/*
|
||||
* if we add this frame remaining time to xtime we may
|
||||
* be OK, if not we need to test j for a complete frame
|
||||
*/
|
||||
if (xtime + hsotg->frame_usecs[j] < utime) {
|
||||
if (hsotg->frame_usecs[j] <
|
||||
max_uframe_usecs[j])
|
||||
continue;
|
||||
}
|
||||
if (xtime >= utime) {
|
||||
t_left = utime;
|
||||
for (k = i; k < 8; k++) {
|
||||
t_left -= hsotg->frame_usecs[k];
|
||||
if (t_left <= 0) {
|
||||
qh->frame_usecs[k] +=
|
||||
hsotg->frame_usecs[k]
|
||||
+ t_left;
|
||||
hsotg->frame_usecs[k] = -t_left;
|
||||
return i;
|
||||
} else {
|
||||
qh->frame_usecs[k] +=
|
||||
hsotg->frame_usecs[k];
|
||||
hsotg->frame_usecs[k] = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
/* add the frame time to x time */
|
||||
xtime += hsotg->frame_usecs[j];
|
||||
/* we must have a fully available next frame or break */
|
||||
if (xtime < utime &&
|
||||
hsotg->frame_usecs[j] == max_uframe_usecs[j])
|
||||
continue;
|
||||
}
|
||||
}
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
static int dwc2_find_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (qh->dev_speed == USB_SPEED_HIGH) {
|
||||
/* if this is a hs transaction we need a full frame */
|
||||
ret = dwc2_find_single_uframe(hsotg, qh);
|
||||
} else {
|
||||
/*
|
||||
* if this is a fs transaction we may need a sequence
|
||||
* of frames
|
||||
*/
|
||||
ret = dwc2_find_multi_uframe(hsotg, qh);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_do_unreserve() - Actually release the periodic reservation
|
||||
*
|
||||
@ -141,6 +329,167 @@ static void dwc2_unreserve_timer_fn(unsigned long data)
|
||||
spin_unlock_irqrestore(&hsotg->lock, flags);
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_check_max_xfer_size() - Checks that the max transfer size allowed in a
|
||||
* host channel is large enough to handle the maximum data transfer in a single
|
||||
* (micro)frame for a periodic transfer
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH for a periodic endpoint
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*/
|
||||
static int dwc2_check_max_xfer_size(struct dwc2_hsotg *hsotg,
|
||||
struct dwc2_qh *qh)
|
||||
{
|
||||
u32 max_xfer_size;
|
||||
u32 max_channel_xfer_size;
|
||||
int status = 0;
|
||||
|
||||
max_xfer_size = dwc2_max_packet(qh->maxp) * dwc2_hb_mult(qh->maxp);
|
||||
max_channel_xfer_size = hsotg->core_params->max_transfer_size;
|
||||
|
||||
if (max_xfer_size > max_channel_xfer_size) {
|
||||
dev_err(hsotg->dev,
|
||||
"%s: Periodic xfer length %d > max xfer length for channel %d\n",
|
||||
__func__, max_xfer_size, max_channel_xfer_size);
|
||||
status = -ENOSPC;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_schedule_periodic() - Schedules an interrupt or isochronous transfer in
|
||||
* the periodic schedule
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH for the periodic transfer. The QH should already contain the
|
||||
* scheduling information.
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*/
|
||||
static int dwc2_schedule_periodic(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
int status;
|
||||
|
||||
status = dwc2_check_max_xfer_size(hsotg, qh);
|
||||
if (status) {
|
||||
dev_dbg(hsotg->dev,
|
||||
"%s: Channel max transfer size too small for periodic transfer\n",
|
||||
__func__);
|
||||
return status;
|
||||
}
|
||||
|
||||
/* Cancel pending unreserve; if canceled OK, unreserve was pending */
|
||||
if (del_timer(&qh->unreserve_timer))
|
||||
WARN_ON(!qh->unreserve_pending);
|
||||
|
||||
/*
|
||||
* Only need to reserve if there's not an unreserve pending, since if an
|
||||
* unreserve is pending then by definition our old reservation is still
|
||||
* valid. Unreserve might still be pending even if we didn't cancel if
|
||||
* dwc2_unreserve_timer_fn() already started. Code in the timer handles
|
||||
* that case.
|
||||
*/
|
||||
if (!qh->unreserve_pending) {
|
||||
if (hsotg->core_params->uframe_sched > 0) {
|
||||
int frame = -1;
|
||||
|
||||
status = dwc2_find_uframe(hsotg, qh);
|
||||
if (status == 0)
|
||||
frame = 7;
|
||||
else if (status > 0)
|
||||
frame = status - 1;
|
||||
|
||||
/* Set the new frame up */
|
||||
if (frame >= 0) {
|
||||
qh->next_active_frame &= ~0x7;
|
||||
qh->next_active_frame |= (frame & 7);
|
||||
dwc2_sch_dbg(hsotg,
|
||||
"QH=%p sched_p nxt=%04x, uf=%d\n",
|
||||
qh, qh->next_active_frame, frame);
|
||||
}
|
||||
|
||||
if (status > 0)
|
||||
status = 0;
|
||||
} else {
|
||||
status = dwc2_periodic_channel_available(hsotg);
|
||||
if (status) {
|
||||
dev_info(hsotg->dev,
|
||||
"%s: No host channel available for periodic transfer\n",
|
||||
__func__);
|
||||
return status;
|
||||
}
|
||||
|
||||
status = dwc2_check_periodic_bandwidth(hsotg, qh);
|
||||
}
|
||||
|
||||
if (status) {
|
||||
dev_dbg(hsotg->dev,
|
||||
"%s: Insufficient periodic bandwidth for periodic transfer\n",
|
||||
__func__);
|
||||
return status;
|
||||
}
|
||||
|
||||
if (hsotg->core_params->uframe_sched <= 0)
|
||||
/* Reserve periodic channel */
|
||||
hsotg->periodic_channels++;
|
||||
|
||||
/* Update claimed usecs per (micro)frame */
|
||||
hsotg->periodic_usecs += qh->host_us;
|
||||
}
|
||||
|
||||
qh->unreserve_pending = 0;
|
||||
|
||||
if (hsotg->core_params->dma_desc_enable > 0)
|
||||
/* Don't rely on SOF and start in ready schedule */
|
||||
list_add_tail(&qh->qh_list_entry, &hsotg->periodic_sched_ready);
|
||||
else
|
||||
/* Always start in inactive schedule */
|
||||
list_add_tail(&qh->qh_list_entry,
|
||||
&hsotg->periodic_sched_inactive);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_deschedule_periodic() - Removes an interrupt or isochronous transfer
|
||||
* from the periodic schedule
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH for the periodic transfer
|
||||
*/
|
||||
static void dwc2_deschedule_periodic(struct dwc2_hsotg *hsotg,
|
||||
struct dwc2_qh *qh)
|
||||
{
|
||||
bool did_modify;
|
||||
|
||||
assert_spin_locked(&hsotg->lock);
|
||||
|
||||
/*
|
||||
* Schedule the unreserve to happen in a little bit. Cases here:
|
||||
* - Unreserve worker might be sitting there waiting to grab the lock.
|
||||
* In this case it will notice it's been schedule again and will
|
||||
* quit.
|
||||
* - Unreserve worker might not be scheduled.
|
||||
*
|
||||
* We should never already be scheduled since dwc2_schedule_periodic()
|
||||
* should have canceled the scheduled unreserve timer (hence the
|
||||
* warning on did_modify).
|
||||
*
|
||||
* We add + 1 to the timer to guarantee that at least 1 jiffy has
|
||||
* passed (otherwise if the jiffy counter might tick right after we
|
||||
* read it and we'll get no delay).
|
||||
*/
|
||||
did_modify = mod_timer(&qh->unreserve_timer,
|
||||
jiffies + DWC2_UNRESERVE_DELAY + 1);
|
||||
WARN_ON(did_modify);
|
||||
qh->unreserve_pending = 1;
|
||||
|
||||
list_del_init(&qh->qh_list_entry);
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_qh_init() - Initializes a QH structure
|
||||
*
|
||||
@ -345,355 +694,6 @@ void dwc2_hcd_qh_free(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
kfree(qh);
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_periodic_channel_available() - Checks that a channel is available for a
|
||||
* periodic transfer
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*/
|
||||
static int dwc2_periodic_channel_available(struct dwc2_hsotg *hsotg)
|
||||
{
|
||||
/*
|
||||
* Currently assuming that there is a dedicated host channel for
|
||||
* each periodic transaction plus at least one host channel for
|
||||
* non-periodic transactions
|
||||
*/
|
||||
int status;
|
||||
int num_channels;
|
||||
|
||||
num_channels = hsotg->core_params->host_channels;
|
||||
if (hsotg->periodic_channels + hsotg->non_periodic_channels <
|
||||
num_channels
|
||||
&& hsotg->periodic_channels < num_channels - 1) {
|
||||
status = 0;
|
||||
} else {
|
||||
dev_dbg(hsotg->dev,
|
||||
"%s: Total channels: %d, Periodic: %d, "
|
||||
"Non-periodic: %d\n", __func__, num_channels,
|
||||
hsotg->periodic_channels, hsotg->non_periodic_channels);
|
||||
status = -ENOSPC;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_check_periodic_bandwidth() - Checks that there is sufficient bandwidth
|
||||
* for the specified QH in the periodic schedule
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH containing periodic bandwidth required
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*
|
||||
* For simplicity, this calculation assumes that all the transfers in the
|
||||
* periodic schedule may occur in the same (micro)frame
|
||||
*/
|
||||
static int dwc2_check_periodic_bandwidth(struct dwc2_hsotg *hsotg,
|
||||
struct dwc2_qh *qh)
|
||||
{
|
||||
int status;
|
||||
s16 max_claimed_usecs;
|
||||
|
||||
status = 0;
|
||||
|
||||
if (qh->dev_speed == USB_SPEED_HIGH || qh->do_split) {
|
||||
/*
|
||||
* High speed mode
|
||||
* Max periodic usecs is 80% x 125 usec = 100 usec
|
||||
*/
|
||||
max_claimed_usecs = 100 - qh->host_us;
|
||||
} else {
|
||||
/*
|
||||
* Full speed mode
|
||||
* Max periodic usecs is 90% x 1000 usec = 900 usec
|
||||
*/
|
||||
max_claimed_usecs = 900 - qh->host_us;
|
||||
}
|
||||
|
||||
if (hsotg->periodic_usecs > max_claimed_usecs) {
|
||||
dev_err(hsotg->dev,
|
||||
"%s: already claimed usecs %d, required usecs %d\n",
|
||||
__func__, hsotg->periodic_usecs, qh->host_us);
|
||||
status = -ENOSPC;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* Microframe scheduler
|
||||
* track the total use in hsotg->frame_usecs
|
||||
* keep each qh use in qh->frame_usecs
|
||||
* when surrendering the qh then donate the time back
|
||||
*/
|
||||
static const unsigned short max_uframe_usecs[] = {
|
||||
100, 100, 100, 100, 100, 100, 30, 0
|
||||
};
|
||||
|
||||
void dwc2_hcd_init_usecs(struct dwc2_hsotg *hsotg)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 8; i++)
|
||||
hsotg->frame_usecs[i] = max_uframe_usecs[i];
|
||||
}
|
||||
|
||||
static int dwc2_find_single_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
unsigned short utime = qh->host_us;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
/* At the start hsotg->frame_usecs[i] = max_uframe_usecs[i] */
|
||||
if (utime <= hsotg->frame_usecs[i]) {
|
||||
hsotg->frame_usecs[i] -= utime;
|
||||
qh->frame_usecs[i] += utime;
|
||||
return i;
|
||||
}
|
||||
}
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
/*
|
||||
* use this for FS apps that can span multiple uframes
|
||||
*/
|
||||
static int dwc2_find_multi_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
unsigned short utime = qh->host_us;
|
||||
unsigned short xtime;
|
||||
int t_left;
|
||||
int i;
|
||||
int j;
|
||||
int k;
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
if (hsotg->frame_usecs[i] <= 0)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* we need n consecutive slots so use j as a start slot
|
||||
* j plus j+1 must be enough time (for now)
|
||||
*/
|
||||
xtime = hsotg->frame_usecs[i];
|
||||
for (j = i + 1; j < 8; j++) {
|
||||
/*
|
||||
* if we add this frame remaining time to xtime we may
|
||||
* be OK, if not we need to test j for a complete frame
|
||||
*/
|
||||
if (xtime + hsotg->frame_usecs[j] < utime) {
|
||||
if (hsotg->frame_usecs[j] <
|
||||
max_uframe_usecs[j])
|
||||
continue;
|
||||
}
|
||||
if (xtime >= utime) {
|
||||
t_left = utime;
|
||||
for (k = i; k < 8; k++) {
|
||||
t_left -= hsotg->frame_usecs[k];
|
||||
if (t_left <= 0) {
|
||||
qh->frame_usecs[k] +=
|
||||
hsotg->frame_usecs[k]
|
||||
+ t_left;
|
||||
hsotg->frame_usecs[k] = -t_left;
|
||||
return i;
|
||||
} else {
|
||||
qh->frame_usecs[k] +=
|
||||
hsotg->frame_usecs[k];
|
||||
hsotg->frame_usecs[k] = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
/* add the frame time to x time */
|
||||
xtime += hsotg->frame_usecs[j];
|
||||
/* we must have a fully available next frame or break */
|
||||
if (xtime < utime &&
|
||||
hsotg->frame_usecs[j] == max_uframe_usecs[j])
|
||||
continue;
|
||||
}
|
||||
}
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
static int dwc2_find_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (qh->dev_speed == USB_SPEED_HIGH) {
|
||||
/* if this is a hs transaction we need a full frame */
|
||||
ret = dwc2_find_single_uframe(hsotg, qh);
|
||||
} else {
|
||||
/*
|
||||
* if this is a fs transaction we may need a sequence
|
||||
* of frames
|
||||
*/
|
||||
ret = dwc2_find_multi_uframe(hsotg, qh);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_check_max_xfer_size() - Checks that the max transfer size allowed in a
|
||||
* host channel is large enough to handle the maximum data transfer in a single
|
||||
* (micro)frame for a periodic transfer
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH for a periodic endpoint
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*/
|
||||
static int dwc2_check_max_xfer_size(struct dwc2_hsotg *hsotg,
|
||||
struct dwc2_qh *qh)
|
||||
{
|
||||
u32 max_xfer_size;
|
||||
u32 max_channel_xfer_size;
|
||||
int status = 0;
|
||||
|
||||
max_xfer_size = dwc2_max_packet(qh->maxp) * dwc2_hb_mult(qh->maxp);
|
||||
max_channel_xfer_size = hsotg->core_params->max_transfer_size;
|
||||
|
||||
if (max_xfer_size > max_channel_xfer_size) {
|
||||
dev_err(hsotg->dev,
|
||||
"%s: Periodic xfer length %d > max xfer length for channel %d\n",
|
||||
__func__, max_xfer_size, max_channel_xfer_size);
|
||||
status = -ENOSPC;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_schedule_periodic() - Schedules an interrupt or isochronous transfer in
|
||||
* the periodic schedule
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH for the periodic transfer. The QH should already contain the
|
||||
* scheduling information.
|
||||
*
|
||||
* Return: 0 if successful, negative error code otherwise
|
||||
*/
|
||||
static int dwc2_schedule_periodic(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
|
||||
{
|
||||
int status;
|
||||
|
||||
status = dwc2_check_max_xfer_size(hsotg, qh);
|
||||
if (status) {
|
||||
dev_dbg(hsotg->dev,
|
||||
"%s: Channel max transfer size too small for periodic transfer\n",
|
||||
__func__);
|
||||
return status;
|
||||
}
|
||||
|
||||
/* Cancel pending unreserve; if canceled OK, unreserve was pending */
|
||||
if (del_timer(&qh->unreserve_timer))
|
||||
WARN_ON(!qh->unreserve_pending);
|
||||
|
||||
/*
|
||||
* Only need to reserve if there's not an unreserve pending, since if an
|
||||
* unreserve is pending then by definition our old reservation is still
|
||||
* valid. Unreserve might still be pending even if we didn't cancel if
|
||||
* dwc2_unreserve_timer_fn() already started. Code in the timer handles
|
||||
* that case.
|
||||
*/
|
||||
if (!qh->unreserve_pending) {
|
||||
if (hsotg->core_params->uframe_sched > 0) {
|
||||
int frame = -1;
|
||||
|
||||
status = dwc2_find_uframe(hsotg, qh);
|
||||
if (status == 0)
|
||||
frame = 7;
|
||||
else if (status > 0)
|
||||
frame = status - 1;
|
||||
|
||||
/* Set the new frame up */
|
||||
if (frame >= 0) {
|
||||
qh->next_active_frame &= ~0x7;
|
||||
qh->next_active_frame |= (frame & 7);
|
||||
dwc2_sch_dbg(hsotg,
|
||||
"QH=%p sched_p nxt=%04x, uf=%d\n",
|
||||
qh, qh->next_active_frame, frame);
|
||||
}
|
||||
|
||||
if (status > 0)
|
||||
status = 0;
|
||||
} else {
|
||||
status = dwc2_periodic_channel_available(hsotg);
|
||||
if (status) {
|
||||
dev_info(hsotg->dev,
|
||||
"%s: No host channel available for periodic transfer\n",
|
||||
__func__);
|
||||
return status;
|
||||
}
|
||||
|
||||
status = dwc2_check_periodic_bandwidth(hsotg, qh);
|
||||
}
|
||||
|
||||
if (status) {
|
||||
dev_dbg(hsotg->dev,
|
||||
"%s: Insufficient periodic bandwidth for periodic transfer\n",
|
||||
__func__);
|
||||
return status;
|
||||
}
|
||||
|
||||
if (hsotg->core_params->uframe_sched <= 0)
|
||||
/* Reserve periodic channel */
|
||||
hsotg->periodic_channels++;
|
||||
|
||||
/* Update claimed usecs per (micro)frame */
|
||||
hsotg->periodic_usecs += qh->host_us;
|
||||
}
|
||||
|
||||
qh->unreserve_pending = 0;
|
||||
|
||||
if (hsotg->core_params->dma_desc_enable > 0)
|
||||
/* Don't rely on SOF and start in ready schedule */
|
||||
list_add_tail(&qh->qh_list_entry, &hsotg->periodic_sched_ready);
|
||||
else
|
||||
/* Always start in inactive schedule */
|
||||
list_add_tail(&qh->qh_list_entry,
|
||||
&hsotg->periodic_sched_inactive);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_deschedule_periodic() - Removes an interrupt or isochronous transfer
|
||||
* from the periodic schedule
|
||||
*
|
||||
* @hsotg: The HCD state structure for the DWC OTG controller
|
||||
* @qh: QH for the periodic transfer
|
||||
*/
|
||||
static void dwc2_deschedule_periodic(struct dwc2_hsotg *hsotg,
|
||||
struct dwc2_qh *qh)
|
||||
{
|
||||
bool did_modify;
|
||||
|
||||
assert_spin_locked(&hsotg->lock);
|
||||
|
||||
/*
|
||||
* Schedule the unreserve to happen in a little bit. Cases here:
|
||||
* - Unreserve worker might be sitting there waiting to grab the lock.
|
||||
* In this case it will notice it's been schedule again and will
|
||||
* quit.
|
||||
* - Unreserve worker might not be scheduled.
|
||||
*
|
||||
* We should never already be scheduled since dwc2_schedule_periodic()
|
||||
* should have canceled the scheduled unreserve timer (hence the
|
||||
* warning on did_modify).
|
||||
*
|
||||
* We add + 1 to the timer to guarantee that at least 1 jiffy has
|
||||
* passed (otherwise if the jiffy counter might tick right after we
|
||||
* read it and we'll get no delay).
|
||||
*/
|
||||
did_modify = mod_timer(&qh->unreserve_timer,
|
||||
jiffies + DWC2_UNRESERVE_DELAY + 1);
|
||||
WARN_ON(did_modify);
|
||||
qh->unreserve_pending = 1;
|
||||
|
||||
list_del_init(&qh->qh_list_entry);
|
||||
}
|
||||
|
||||
/**
|
||||
* dwc2_hcd_qh_add() - Adds a QH to either the non periodic or periodic
|
||||
* schedule if it is not already in the schedule. If the QH is already in
|
||||
|
||||
Loading…
Reference in New Issue
Block a user