linux-stable/sound/usb/clock.c
Takashi Iwai d2e8f64125 ALSA: usb-audio: Explicitly set up the clock selector
In the current code, we have some assumption that the audio clock
selector has been set up implicitly and don't want to touch it unless
it's really needed for the fallback autoclock setup.  This works for
most devices but some seem having a problem.  Partially this was
covered for the devices with a single connector at the initialization
phase (commit 086b957cc1 "ALSA: usb-audio: Skip the clock selector
inquiry for single connections"), but also there are cases where the
wrong clock set up is kept silently.  The latter seems to be the cause
of the noises on Behringer devices.

In this patch, we explicitly set up the audio clock selector whenever
the appropriate node is found.

Reported-by: Geraldo Nascimento <geraldogabriel@gmail.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199327
Link: https://lore.kernel.org/r/CAEsQvcvF7LnO8PxyyCxuRCx=7jNeSCvFAd-+dE0g_rd1rOxxdw@mail.gmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210413084152.32325-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-13 12:05:12 +02:00

701 lines
18 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Clock domain and sample rate management functions
*/
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/usb/audio-v3.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include "usbaudio.h"
#include "card.h"
#include "helper.h"
#include "clock.h"
#include "quirks.h"
static void *find_uac_clock_desc(struct usb_host_interface *iface, int id,
bool (*validator)(void *, int), u8 type)
{
void *cs = NULL;
while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen,
cs, type))) {
if (validator(cs, id))
return cs;
}
return NULL;
}
static bool validate_clock_source_v2(void *p, int id)
{
struct uac_clock_source_descriptor *cs = p;
return cs->bClockID == id;
}
static bool validate_clock_source_v3(void *p, int id)
{
struct uac3_clock_source_descriptor *cs = p;
return cs->bClockID == id;
}
static bool validate_clock_selector_v2(void *p, int id)
{
struct uac_clock_selector_descriptor *cs = p;
return cs->bClockID == id;
}
static bool validate_clock_selector_v3(void *p, int id)
{
struct uac3_clock_selector_descriptor *cs = p;
return cs->bClockID == id;
}
static bool validate_clock_multiplier_v2(void *p, int id)
{
struct uac_clock_multiplier_descriptor *cs = p;
return cs->bClockID == id;
}
static bool validate_clock_multiplier_v3(void *p, int id)
{
struct uac3_clock_multiplier_descriptor *cs = p;
return cs->bClockID == id;
}
#define DEFINE_FIND_HELPER(name, obj, validator, type) \
static obj *name(struct usb_host_interface *iface, int id) \
{ \
return find_uac_clock_desc(iface, id, validator, type); \
}
DEFINE_FIND_HELPER(snd_usb_find_clock_source,
struct uac_clock_source_descriptor,
validate_clock_source_v2, UAC2_CLOCK_SOURCE);
DEFINE_FIND_HELPER(snd_usb_find_clock_source_v3,
struct uac3_clock_source_descriptor,
validate_clock_source_v3, UAC3_CLOCK_SOURCE);
DEFINE_FIND_HELPER(snd_usb_find_clock_selector,
struct uac_clock_selector_descriptor,
validate_clock_selector_v2, UAC2_CLOCK_SELECTOR);
DEFINE_FIND_HELPER(snd_usb_find_clock_selector_v3,
struct uac3_clock_selector_descriptor,
validate_clock_selector_v3, UAC3_CLOCK_SELECTOR);
DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier,
struct uac_clock_multiplier_descriptor,
validate_clock_multiplier_v2, UAC2_CLOCK_MULTIPLIER);
DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier_v3,
struct uac3_clock_multiplier_descriptor,
validate_clock_multiplier_v3, UAC3_CLOCK_MULTIPLIER);
static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
{
unsigned char buf;
int ret;
ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
UAC2_CS_CUR,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
UAC2_CX_CLOCK_SELECTOR << 8,
snd_usb_ctrl_intf(chip) | (selector_id << 8),
&buf, sizeof(buf));
if (ret < 0)
return ret;
return buf;
}
static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
unsigned char pin)
{
int ret;
ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
UAC2_CS_CUR,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
UAC2_CX_CLOCK_SELECTOR << 8,
snd_usb_ctrl_intf(chip) | (selector_id << 8),
&pin, sizeof(pin));
if (ret < 0)
return ret;
if (ret != sizeof(pin)) {
usb_audio_err(chip,
"setting selector (id %d) unexpected length %d\n",
selector_id, ret);
return -EINVAL;
}
ret = uac_clock_selector_get_val(chip, selector_id);
if (ret < 0)
return ret;
if (ret != pin) {
usb_audio_err(chip,
"setting selector (id %d) to %x failed (current: %d)\n",
selector_id, pin, ret);
return -EINVAL;
}
return ret;
}
static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
const struct audioformat *fmt,
int source_id)
{
bool ret = false;
int count;
unsigned char data;
struct usb_device *dev = chip->dev;
if (fmt->protocol == UAC_VERSION_2) {
struct uac_clock_source_descriptor *cs_desc =
snd_usb_find_clock_source(chip->ctrl_intf, source_id);
if (!cs_desc)
return false;
/*
* Assume the clock is valid if clock source supports only one
* single sample rate, the terminal is connected directly to it
* (there is no clock selector) and clock type is internal.
* This is to deal with some Denon DJ controllers that always
* reports that clock is invalid.
*/
if (fmt->nr_rates == 1 &&
(fmt->clock & 0xff) == cs_desc->bClockID &&
(cs_desc->bmAttributes & 0x3) !=
UAC_CLOCK_SOURCE_TYPE_EXT)
return true;
}
/*
* MOTU MicroBook IIc
* Sample rate changes takes more than 2 seconds for this device. Clock
* validity request returns false during that period.
*/
if (chip->usb_id == USB_ID(0x07fd, 0x0004)) {
count = 0;
while ((!ret) && (count < 50)) {
int err;
msleep(100);
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
UAC2_CS_CONTROL_CLOCK_VALID << 8,
snd_usb_ctrl_intf(chip) | (source_id << 8),
&data, sizeof(data));
if (err < 0) {
dev_warn(&dev->dev,
"%s(): cannot get clock validity for id %d\n",
__func__, source_id);
return false;
}
ret = !!data;
count++;
}
}
return ret;
}
static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
const struct audioformat *fmt,
int source_id)
{
int err;
unsigned char data;
struct usb_device *dev = chip->dev;
u32 bmControls;
if (fmt->protocol == UAC_VERSION_3) {
struct uac3_clock_source_descriptor *cs_desc =
snd_usb_find_clock_source_v3(chip->ctrl_intf, source_id);
if (!cs_desc)
return false;
bmControls = le32_to_cpu(cs_desc->bmControls);
} else { /* UAC_VERSION_1/2 */
struct uac_clock_source_descriptor *cs_desc =
snd_usb_find_clock_source(chip->ctrl_intf, source_id);
if (!cs_desc)
return false;
bmControls = cs_desc->bmControls;
}
/* If a clock source can't tell us whether it's valid, we assume it is */
if (!uac_v2v3_control_is_readable(bmControls,
UAC2_CS_CONTROL_CLOCK_VALID))
return true;
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
UAC2_CS_CONTROL_CLOCK_VALID << 8,
snd_usb_ctrl_intf(chip) | (source_id << 8),
&data, sizeof(data));
if (err < 0) {
dev_warn(&dev->dev,
"%s(): cannot get clock validity for id %d\n",
__func__, source_id);
return false;
}
if (data)
return true;
else
return uac_clock_source_is_valid_quirk(chip, fmt, source_id);
}
static int __uac_clock_find_source(struct snd_usb_audio *chip,
const struct audioformat *fmt, int entity_id,
unsigned long *visited, bool validate)
{
struct uac_clock_source_descriptor *source;
struct uac_clock_selector_descriptor *selector;
struct uac_clock_multiplier_descriptor *multiplier;
entity_id &= 0xff;
if (test_and_set_bit(entity_id, visited)) {
usb_audio_warn(chip,
"%s(): recursive clock topology detected, id %d.\n",
__func__, entity_id);
return -EINVAL;
}
/* first, see if the ID we're looking for is a clock source already */
source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
if (source) {
entity_id = source->bClockID;
if (validate && !uac_clock_source_is_valid(chip, fmt,
entity_id)) {
usb_audio_err(chip,
"clock source %d is not valid, cannot use\n",
entity_id);
return -ENXIO;
}
return entity_id;
}
selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
if (selector) {
int ret, i, cur, err;
if (selector->bNrInPins == 1) {
ret = 1;
goto find_source;
}
/* the entity ID we are looking for is a selector.
* find out what it currently selects */
ret = uac_clock_selector_get_val(chip, selector->bClockID);
if (ret < 0)
return ret;
/* Selector values are one-based */
if (ret > selector->bNrInPins || ret < 1) {
usb_audio_err(chip,
"%s(): selector reported illegal value, id %d, ret %d\n",
__func__, selector->bClockID, ret);
return -EINVAL;
}
find_source:
cur = ret;
ret = __uac_clock_find_source(chip, fmt,
selector->baCSourceID[ret - 1],
visited, validate);
if (ret > 0) {
err = uac_clock_selector_set_val(chip, entity_id, cur);
if (err < 0)
return err;
}
if (!validate || ret > 0 || !chip->autoclock)
return ret;
/* The current clock source is invalid, try others. */
for (i = 1; i <= selector->bNrInPins; i++) {
if (i == cur)
continue;
ret = __uac_clock_find_source(chip, fmt,
selector->baCSourceID[i - 1],
visited, true);
if (ret < 0)
continue;
err = uac_clock_selector_set_val(chip, entity_id, i);
if (err < 0)
continue;
usb_audio_info(chip,
"found and selected valid clock source %d\n",
ret);
return ret;
}
return -ENXIO;
}
/* FIXME: multipliers only act as pass-thru element for now */
multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
if (multiplier)
return __uac_clock_find_source(chip, fmt,
multiplier->bCSourceID,
visited, validate);
return -EINVAL;
}
static int __uac3_clock_find_source(struct snd_usb_audio *chip,
const struct audioformat *fmt, int entity_id,
unsigned long *visited, bool validate)
{
struct uac3_clock_source_descriptor *source;
struct uac3_clock_selector_descriptor *selector;
struct uac3_clock_multiplier_descriptor *multiplier;
entity_id &= 0xff;
if (test_and_set_bit(entity_id, visited)) {
usb_audio_warn(chip,
"%s(): recursive clock topology detected, id %d.\n",
__func__, entity_id);
return -EINVAL;
}
/* first, see if the ID we're looking for is a clock source already */
source = snd_usb_find_clock_source_v3(chip->ctrl_intf, entity_id);
if (source) {
entity_id = source->bClockID;
if (validate && !uac_clock_source_is_valid(chip, fmt,
entity_id)) {
usb_audio_err(chip,
"clock source %d is not valid, cannot use\n",
entity_id);
return -ENXIO;
}
return entity_id;
}
selector = snd_usb_find_clock_selector_v3(chip->ctrl_intf, entity_id);
if (selector) {
int ret, i, cur, err;
/* the entity ID we are looking for is a selector.
* find out what it currently selects */
ret = uac_clock_selector_get_val(chip, selector->bClockID);
if (ret < 0)
return ret;
/* Selector values are one-based */
if (ret > selector->bNrInPins || ret < 1) {
usb_audio_err(chip,
"%s(): selector reported illegal value, id %d, ret %d\n",
__func__, selector->bClockID, ret);
return -EINVAL;
}
cur = ret;
ret = __uac3_clock_find_source(chip, fmt,
selector->baCSourceID[ret - 1],
visited, validate);
if (ret > 0) {
err = uac_clock_selector_set_val(chip, entity_id, cur);
if (err < 0)
return err;
}
if (!validate || ret > 0 || !chip->autoclock)
return ret;
/* The current clock source is invalid, try others. */
for (i = 1; i <= selector->bNrInPins; i++) {
int err;
if (i == cur)
continue;
ret = __uac3_clock_find_source(chip, fmt,
selector->baCSourceID[i - 1],
visited, true);
if (ret < 0)
continue;
err = uac_clock_selector_set_val(chip, entity_id, i);
if (err < 0)
continue;
usb_audio_info(chip,
"found and selected valid clock source %d\n",
ret);
return ret;
}
return -ENXIO;
}
/* FIXME: multipliers only act as pass-thru element for now */
multiplier = snd_usb_find_clock_multiplier_v3(chip->ctrl_intf,
entity_id);
if (multiplier)
return __uac3_clock_find_source(chip, fmt,
multiplier->bCSourceID,
visited, validate);
return -EINVAL;
}
/*
* For all kinds of sample rate settings and other device queries,
* the clock source (end-leaf) must be used. However, clock selectors,
* clock multipliers and sample rate converters may be specified as
* clock source input to terminal. This functions walks the clock path
* to its end and tries to find the source.
*
* The 'visited' bitfield is used internally to detect recursive loops.
*
* Returns the clock source UnitID (>=0) on success, or an error.
*/
int snd_usb_clock_find_source(struct snd_usb_audio *chip,
const struct audioformat *fmt, bool validate)
{
DECLARE_BITMAP(visited, 256);
memset(visited, 0, sizeof(visited));
switch (fmt->protocol) {
case UAC_VERSION_2:
return __uac_clock_find_source(chip, fmt, fmt->clock, visited,
validate);
case UAC_VERSION_3:
return __uac3_clock_find_source(chip, fmt, fmt->clock, visited,
validate);
default:
return -EINVAL;
}
}
static int set_sample_rate_v1(struct snd_usb_audio *chip,
const struct audioformat *fmt, int rate)
{
struct usb_device *dev = chip->dev;
unsigned char data[3];
int err, crate;
/* if endpoint doesn't have sampling rate control, bail out */
if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
return 0;
data[0] = rate;
data[1] = rate >> 8;
data[2] = rate >> 16;
err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
fmt->endpoint, data, sizeof(data));
if (err < 0) {
dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n",
fmt->iface, fmt->altsetting, rate, fmt->endpoint);
return err;
}
/* Don't check the sample rate for devices which we know don't
* support reading */
if (snd_usb_get_sample_rate_quirk(chip))
return 0;
/* the firmware is likely buggy, don't repeat to fail too many times */
if (chip->sample_rate_read_error > 2)
return 0;
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
UAC_EP_CS_ATTR_SAMPLE_RATE << 8,
fmt->endpoint, data, sizeof(data));
if (err < 0) {
dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
fmt->iface, fmt->altsetting, fmt->endpoint);
chip->sample_rate_read_error++;
return 0; /* some devices don't support reading */
}
crate = data[0] | (data[1] << 8) | (data[2] << 16);
if (!crate) {
dev_info(&dev->dev, "failed to read current rate; disabling the check\n");
chip->sample_rate_read_error = 3; /* three strikes, see above */
return 0;
}
if (crate != rate) {
dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate);
// runtime->rate = crate;
}
return 0;
}
static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
int altsetting, int clock)
{
struct usb_device *dev = chip->dev;
__le32 data;
int err;
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
UAC2_CS_CONTROL_SAM_FREQ << 8,
snd_usb_ctrl_intf(chip) | (clock << 8),
&data, sizeof(data));
if (err < 0) {
dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n",
iface, altsetting, err);
return 0;
}
return le32_to_cpu(data);
}
/*
* Try to set the given sample rate:
*
* Return 0 if the clock source is read-only, the actual rate on success,
* or a negative error code.
*
* This function gets called from format.c to validate each sample rate, too.
* Hence no message is shown upon error
*/
int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
const struct audioformat *fmt,
int clock, int rate)
{
bool writeable;
u32 bmControls;
__le32 data;
int err;
if (fmt->protocol == UAC_VERSION_3) {
struct uac3_clock_source_descriptor *cs_desc;
cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
bmControls = le32_to_cpu(cs_desc->bmControls);
} else {
struct uac_clock_source_descriptor *cs_desc;
cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
bmControls = cs_desc->bmControls;
}
writeable = uac_v2v3_control_is_writeable(bmControls,
UAC2_CS_CONTROL_SAM_FREQ);
if (!writeable)
return 0;
data = cpu_to_le32(rate);
err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
UAC2_CS_CONTROL_SAM_FREQ << 8,
snd_usb_ctrl_intf(chip) | (clock << 8),
&data, sizeof(data));
if (err < 0)
return err;
return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
}
static int set_sample_rate_v2v3(struct snd_usb_audio *chip,
const struct audioformat *fmt, int rate)
{
int cur_rate, prev_rate;
int clock;
/* First, try to find a valid clock. This may trigger
* automatic clock selection if the current clock is not
* valid.
*/
clock = snd_usb_clock_find_source(chip, fmt, true);
if (clock < 0) {
/* We did not find a valid clock, but that might be
* because the current sample rate does not match an
* external clock source. Try again without validation
* and we will do another validation after setting the
* rate.
*/
clock = snd_usb_clock_find_source(chip, fmt, false);
if (clock < 0)
return clock;
}
prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
if (prev_rate == rate)
goto validation;
cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate);
if (cur_rate < 0) {
usb_audio_err(chip,
"%d:%d: cannot set freq %d (v2/v3): err %d\n",
fmt->iface, fmt->altsetting, rate, cur_rate);
return cur_rate;
}
if (!cur_rate)
cur_rate = prev_rate;
if (cur_rate != rate) {
usb_audio_dbg(chip,
"%d:%d: freq mismatch: req %d, clock runs @%d\n",
fmt->iface, fmt->altsetting, rate, cur_rate);
/* continue processing */
}
validation:
/* validate clock after rate change */
if (!uac_clock_source_is_valid(chip, fmt, clock))
return -ENXIO;
return 0;
}
int snd_usb_init_sample_rate(struct snd_usb_audio *chip,
const struct audioformat *fmt, int rate)
{
usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n",
fmt->iface, fmt->altsetting, rate, fmt->clock);
switch (fmt->protocol) {
case UAC_VERSION_1:
default:
return set_sample_rate_v1(chip, fmt, rate);
case UAC_VERSION_3:
if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
if (rate != UAC3_BADD_SAMPLING_RATE)
return -ENXIO;
else
return 0;
}
fallthrough;
case UAC_VERSION_2:
return set_sample_rate_v2v3(chip, fmt, rate);
}
}