3 files changed, 158 insertions, 45 deletions

diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index f3ca59005d91..f174230d07d5 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -560,16 +560,60 @@ static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
 	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, int iface,
-			      struct usb_host_interface *alts,
-			      struct audioformat *fmt, int rate)
+				struct usb_host_interface *alts,
+				struct audioformat *fmt, int rate)
 {
 	struct usb_device *dev = chip->dev;
-	__le32 data;
-	int err, cur_rate, prev_rate;
+	int cur_rate, prev_rate;
 	int clock;
-	bool writeable;
-	u32 bmControls;
 
 	/* First, try to find a valid clock. This may trigger
 	 * automatic clock selection if the current clock is not
@@ -592,50 +636,22 @@ static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
 	if (prev_rate == rate)
 		goto validation;
 
-	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;
+	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",
+			      iface, fmt->altsetting, rate, cur_rate);
+		return cur_rate;
 	}
 
-	writeable = uac_v2v3_control_is_writeable(bmControls,
-						  UAC2_CS_CONTROL_SAM_FREQ);
-	if (writeable) {
-		data = cpu_to_le32(rate);
-		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(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) {
-			usb_audio_err(chip,
-				"%d:%d: cannot set freq %d (v2/v3): err %d\n",
-				iface, fmt->altsetting, rate, err);
-			return err;
-		}
-
-		cur_rate = get_sample_rate_v2v3(chip, iface,
-						fmt->altsetting, clock);
-	} else {
+	if (!cur_rate)
 		cur_rate = prev_rate;
-	}
 
 	if (cur_rate != rate) {
-		if (!writeable) {
-			usb_audio_warn(chip,
-				 "%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
-				 iface, fmt->altsetting, rate, cur_rate);
-			return -ENXIO;
-		}
-		usb_audio_dbg(chip,
-			"current rate %d is different from the runtime rate %d\n",
-			cur_rate, rate);
+		usb_audio_warn(chip,
+			       "%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
+			       fmt->iface, fmt->altsetting, rate, cur_rate);
+		return -ENXIO;
 	}
 
 	/* Some devices doesn't respond to sample rate changes while the
diff --git a/sound/usb/clock.h b/sound/usb/clock.h
index 68df0fbe09d0..97597f5a3c18 100644
--- a/sound/usb/clock.h
+++ b/sound/usb/clock.h
@@ -9,4 +9,8 @@ int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
 int snd_usb_clock_find_source(struct snd_usb_audio *chip,
 			      struct audioformat *fmt, bool validate);
 
+int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
+				 const struct audioformat *fmt,
+				 int clock, int rate);
+
 #endif /* __USBAUDIO_CLOCK_H */
diff --git a/sound/usb/format.c b/sound/usb/format.c
index 3bfead393aa3..3348032daa16 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -417,6 +417,97 @@ static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
 	return -ENODEV;
 }
 
+/* check whether the given altsetting is supported for the already set rate */
+static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface,
+					int altsetting)
+{
+	struct usb_device *dev = chip->dev;
+	__le64 raw_data = 0;
+	u64 data;
+	int err;
+
+	/* we assume 64bit is enough for any altsettings */
+	if (snd_BUG_ON(altsetting >= 64 - 8))
+		return false;
+
+	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
+			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+			      UAC2_AS_VAL_ALT_SETTINGS << 8,
+			      iface, &raw_data, sizeof(raw_data));
+	if (err < 0)
+		return false;
+
+	data = le64_to_cpu(raw_data);
+	/* first byte contains the bitmap size */
+	if ((data & 0xff) * 8 < altsetting)
+		return false;
+	if (data & (1ULL << (altsetting + 8)))
+		return true;
+
+	return false;
+}
+
+/*
+ * Validate each sample rate with the altsetting
+ * Rebuild the rate table if only partial values are valid
+ */
+static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
+					   struct audioformat *fp,
+					   int clock)
+{
+	struct usb_device *dev = chip->dev;
+	unsigned int *table;
+	unsigned int nr_rates;
+	unsigned int rate_min = 0x7fffffff;
+	unsigned int rate_max = 0;
+	unsigned int rates = 0;
+	int i, err;
+
+	table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL);
+	if (!table)
+		return -ENOMEM;
+
+	/* clear the interface altsetting at first */
+	usb_set_interface(dev, fp->iface, 0);
+
+	nr_rates = 0;
+	for (i = 0; i < fp->nr_rates; i++) {
+		err = snd_usb_set_sample_rate_v2v3(chip, fp, clock,
+						   fp->rate_table[i]);
+		if (err < 0)
+			continue;
+
+		if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting)) {
+			table[nr_rates++] = fp->rate_table[i];
+			if (rate_min > fp->rate_table[i])
+				rate_min = fp->rate_table[i];
+			if (rate_max < fp->rate_table[i])
+				rate_max = fp->rate_table[i];
+			rates |= snd_pcm_rate_to_rate_bit(fp->rate_table[i]);
+		}
+	}
+
+	if (!nr_rates) {
+		usb_audio_dbg(chip,
+			      "No valid sample rate available for %d:%d, assuming a firmware bug\n",
+			      fp->iface, fp->altsetting);
+		nr_rates = fp->nr_rates; /* continue as is */
+	}
+
+	if (fp->nr_rates == nr_rates) {
+		kfree(table);
+		return 0;
+	}
+
+	kfree(fp->rate_table);
+	fp->rate_table = table;
+	fp->nr_rates = nr_rates;
+	fp->rate_min = rate_min;
+	fp->rate_max = rate_max;
+	fp->rates = rates;
+	return 0;
+}
+
 /*
  * parse the format descriptor and stores the possible sample rates
  * on the audioformat table (audio class v2 and v3).
@@ -509,6 +600,8 @@ static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
 	 * allocated, so the rates will be stored */
 	parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
 
+	ret = validate_sample_rate_table_v2v3(chip, fp, clock);
+
 err_free:
 	kfree(data);
 err: