#include "pcm.h"
#include "quirks.h"
-#define EP_FLAG_ACTIVATED 0
#define EP_FLAG_RUNNING 1
#define EP_FLAG_STOPPING 2
list_for_each_entry(ep, &chip->ep_list, list) {
if (ep->ep_num == ep_num &&
ep->iface == alts->desc.bInterfaceNumber &&
- ep->alt_idx == alts->desc.bAlternateSetting) {
+ ep->altsetting == alts->desc.bAlternateSetting) {
snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n",
- ep_num, ep->iface, ep->alt_idx, ep);
+ ep_num, ep->iface, ep->altsetting, ep);
goto __exit_unlock;
}
}
ep->type = type;
ep->ep_num = ep_num;
ep->iface = alts->desc.bInterfaceNumber;
- ep->alt_idx = alts->desc.bAlternateSetting;
+ ep->altsetting = alts->desc.bAlternateSetting;
INIT_LIST_HEAD(&ep->ready_playback_urbs);
ep_num &= USB_ENDPOINT_NUMBER_MASK;
snd_pcm_format_t pcm_format,
unsigned int channels,
unsigned int period_bytes,
+ unsigned int frames_per_period,
+ unsigned int periods_per_buffer,
struct audioformat *fmt,
struct snd_usb_endpoint *sync_ep)
{
- unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms;
- int is_playback = usb_pipeout(ep->pipe);
+ unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
+ unsigned int max_packs_per_period, urbs_per_period, urb_packs;
+ unsigned int max_urbs, i;
int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
else
ep->curpacksize = maxsize;
- if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL)
+ if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
packs_per_ms = 8 >> ep->datainterval;
- else
- packs_per_ms = 1;
-
- if (is_playback && !snd_usb_endpoint_implicit_feedback_sink(ep)) {
- urb_packs = max(ep->chip->nrpacks, 1);
- urb_packs = min(urb_packs, (unsigned int) MAX_PACKS);
+ max_packs_per_urb = MAX_PACKS_HS;
} else {
- urb_packs = 1;
+ packs_per_ms = 1;
+ max_packs_per_urb = MAX_PACKS;
}
+ if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
+ max_packs_per_urb = min(max_packs_per_urb,
+ 1U << sync_ep->syncinterval);
+ max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
- urb_packs *= packs_per_ms;
+ /*
+ * Capture endpoints need to use small URBs because there's no way
+ * to tell in advance where the next period will end, and we don't
+ * want the next URB to complete much after the period ends.
+ *
+ * Playback endpoints with implicit sync much use the same parameters
+ * as their corresponding capture endpoint.
+ */
+ if (usb_pipein(ep->pipe) ||
+ snd_usb_endpoint_implicit_feedback_sink(ep)) {
- if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
- urb_packs = min(urb_packs, 1U << sync_ep->syncinterval);
+ /* make capture URBs <= 1 ms and smaller than a period */
+ urb_packs = min(max_packs_per_urb, packs_per_ms);
+ while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
+ urb_packs >>= 1;
+ ep->nurbs = MAX_URBS;
- /* decide how many packets to be used */
- if (is_playback && !snd_usb_endpoint_implicit_feedback_sink(ep)) {
- unsigned int minsize, maxpacks;
+ /*
+ * Playback endpoints without implicit sync are adjusted so that
+ * a period fits as evenly as possible in the smallest number of
+ * URBs. The total number of URBs is adjusted to the size of the
+ * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits.
+ */
+ } else {
/* determine how small a packet can be */
- minsize = (ep->freqn >> (16 - ep->datainterval))
- * (frame_bits >> 3);
+ minsize = (ep->freqn >> (16 - ep->datainterval)) *
+ (frame_bits >> 3);
/* with sync from device, assume it can be 12% lower */
if (sync_ep)
minsize -= minsize >> 3;
minsize = max(minsize, 1u);
- total_packs = (period_bytes + minsize - 1) / minsize;
- /* we need at least two URBs for queueing */
- if (total_packs < 2) {
- total_packs = 2;
- } else {
- /* and we don't want too long a queue either */
- maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
- total_packs = min(total_packs, maxpacks);
- }
- } else {
- while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
- urb_packs >>= 1;
- total_packs = MAX_URBS * urb_packs;
- }
- ep->nurbs = (total_packs + urb_packs - 1) / urb_packs;
- if (ep->nurbs > MAX_URBS) {
- /* too much... */
- ep->nurbs = MAX_URBS;
- total_packs = MAX_URBS * urb_packs;
- } else if (ep->nurbs < 2) {
- /* too little - we need at least two packets
- * to ensure contiguous playback/capture
- */
- ep->nurbs = 2;
+ /* how many packets will contain an entire ALSA period? */
+ max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
+
+ /* how many URBs will contain a period? */
+ urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
+ max_packs_per_urb);
+ /* how many packets are needed in each URB? */
+ urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
+
+ /* limit the number of frames in a single URB */
+ ep->max_urb_frames = DIV_ROUND_UP(frames_per_period,
+ urbs_per_period);
+
+ /* try to use enough URBs to contain an entire ALSA buffer */
+ max_urbs = min((unsigned) MAX_URBS,
+ MAX_QUEUE * packs_per_ms / urb_packs);
+ ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer);
}
/* allocate and initialize data urbs */
struct snd_urb_ctx *u = &ep->urb[i];
u->index = i;
u->ep = ep;
- u->packets = (i + 1) * total_packs / ep->nurbs
- - i * total_packs / ep->nurbs;
+ u->packets = urb_packs;
u->buffer_size = maxsize * u->packets;
if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
/*
* configure a sync endpoint
*/
-static int sync_ep_set_params(struct snd_usb_endpoint *ep,
- struct audioformat *fmt)
+static int sync_ep_set_params(struct snd_usb_endpoint *ep)
{
int i;
* @pcm_format: the audio fomat.
* @channels: the number of audio channels.
* @period_bytes: the number of bytes in one alsa period.
+ * @period_frames: the number of frames in one alsa period.
+ * @buffer_periods: the number of periods in one alsa buffer.
* @rate: the frame rate.
* @fmt: the USB audio format information
* @sync_ep: the sync endpoint to use, if any
snd_pcm_format_t pcm_format,
unsigned int channels,
unsigned int period_bytes,
+ unsigned int period_frames,
+ unsigned int buffer_periods,
unsigned int rate,
struct audioformat *fmt,
struct snd_usb_endpoint *sync_ep)
switch (ep->type) {
case SND_USB_ENDPOINT_TYPE_DATA:
err = data_ep_set_params(ep, pcm_format, channels,
- period_bytes, fmt, sync_ep);
+ period_bytes, period_frames,
+ buffer_periods, fmt, sync_ep);
break;
case SND_USB_ENDPOINT_TYPE_SYNC:
- err = sync_ep_set_params(ep, fmt);
+ err = sync_ep_set_params(ep);
break;
default:
err = -EINVAL;
*
* @ep: the endpoint to deactivate
*
- * If the endpoint is not currently in use, this functions will select the
- * alternate interface setting 0 for the interface of this endpoint.
+ * If the endpoint is not currently in use, this functions will
+ * deactivate its associated URBs.
*
* In case of any active users, this functions does nothing.
- *
- * Returns an error if usb_set_interface() failed, 0 in all other
- * cases.
*/
-int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
+void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
{
if (!ep)
- return -EINVAL;
-
- deactivate_urbs(ep, true);
- wait_clear_urbs(ep);
+ return;
if (ep->use_count != 0)
- return 0;
-
- clear_bit(EP_FLAG_ACTIVATED, &ep->flags);
+ return;
- return 0;
+ deactivate_urbs(ep, true);
+ wait_clear_urbs(ep);
}
/**
projects / cascardo / linux.git / blobdiff