From patchwork Tue May 18 15:21:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 442524 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C3BF8C433ED for ; Tue, 18 May 2021 15:23:19 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1992C611BD for ; Tue, 18 May 2021 15:23:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1992C611BD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 9C99B1719; Tue, 18 May 2021 17:22:27 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 9C99B1719 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1621351397; bh=LJ2g3eDevVHIg0lfS7fpCgMipPxpRoSiDhRn5xL9a7E=; h=From:To:Subject:Date:In-Reply-To:References:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=JNR0/I5G7PFLS5NmdKV+u0sS8BT9qSMSgkhydvEKiEV1b2YIg0dQ5Vo4VxCMYTPsf mFrx38cG8x8/KIDjxt9e946po7eE6+O57KSS+uyNJ648SYk5ByZns/qXaVhoa9Ps2i dyOOBO8iPQmGsdQY94Qjwvs1gS5bOr9VwMqCtZu0= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 1EED9F802E3; Tue, 18 May 2021 17:21:36 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id BFD0EF80229; Tue, 18 May 2021 17:21:34 +0200 (CEST) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id E5B83F80217 for ; Tue, 18 May 2021 17:21:25 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz E5B83F80217 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 6595FB14B for ; Tue, 18 May 2021 15:21:25 +0000 (UTC) From: Takashi Iwai To: alsa-devel@alsa-project.org Subject: [PATCH 1/2] ALSA: usb-audio: Refactoring UAC2/3 clock setup code Date: Tue, 18 May 2021 17:21:11 +0200 Message-Id: <20210518152112.8016-2-tiwai@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210518152112.8016-1-tiwai@suse.de> References: <20210518152112.8016-1-tiwai@suse.de> MIME-Version: 1.0 X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" This patch just does refactoring of the UAC2/3 clock setup code. There should be no functional changes. The major changes are: * Provide union objects for pointing both UAC2 and UAC3 objects * Unify clock source, selector and multiplier helper functions * Unify __uac_clock_find_source() to deal with both UAC2 and UAC3 equally Signed-off-by: Takashi Iwai --- sound/usb/clock.c | 285 ++++++++++++++-------------------------------- 1 file changed, 85 insertions(+), 200 deletions(-) diff --git a/sound/usb/clock.c b/sound/usb/clock.c index 17bbde73d4d1..48a79f1b6233 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -21,82 +21,77 @@ #include "clock.h" #include "quirks.h" +union uac23_clock_source_desc { + struct uac_clock_source_descriptor v2; + struct uac3_clock_source_descriptor v3; +}; + +union uac23_clock_selector_desc { + struct uac_clock_selector_descriptor v2; + struct uac3_clock_selector_descriptor v3; +}; + +union uac23_clock_multiplier_desc { + struct uac_clock_multiplier_descriptor v2; + struct uac_clock_multiplier_descriptor v3; +}; + +#define GET_VAL(p, proto, field) \ + ((proto) == UAC_VERSION_3 ? (p)->v3.field : (p)->v2.field) + static void *find_uac_clock_desc(struct usb_host_interface *iface, int id, - bool (*validator)(void *, int), u8 type) + bool (*validator)(void *, int, int), + u8 type, int proto) { void *cs = NULL; while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen, cs, type))) { - if (validator(cs, id)) + if (validator(cs, id, proto)) return cs; } return NULL; } -static bool validate_clock_source_v2(void *p, int id) +static bool validate_clock_source(void *p, int id, int proto) { - struct uac_clock_source_descriptor *cs = p; - return cs->bClockID == id; -} + union uac23_clock_source_desc *cs = p; -static bool validate_clock_source_v3(void *p, int id) -{ - struct uac3_clock_source_descriptor *cs = p; - return cs->bClockID == id; + return GET_VAL(cs, proto, bClockID) == id; } -static bool validate_clock_selector_v2(void *p, int id) +static bool validate_clock_selector(void *p, int id, int proto) { - struct uac_clock_selector_descriptor *cs = p; - return cs->bClockID == id; -} + union uac23_clock_selector_desc *cs = p; -static bool validate_clock_selector_v3(void *p, int id) -{ - struct uac3_clock_selector_descriptor *cs = p; - return cs->bClockID == id; + return GET_VAL(cs, proto, bClockID) == id; } -static bool validate_clock_multiplier_v2(void *p, int id) +static bool validate_clock_multiplier(void *p, int id, int proto) { - struct uac_clock_multiplier_descriptor *cs = p; - return cs->bClockID == id; -} + union uac23_clock_multiplier_desc *cs = p; -static bool validate_clock_multiplier_v3(void *p, int id) -{ - struct uac3_clock_multiplier_descriptor *cs = p; - return cs->bClockID == id; + return GET_VAL(cs, proto, 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 DEFINE_FIND_HELPER(name, obj, validator, type2, type3) \ +static obj *name(struct snd_usb_audio *chip, int id, int proto) \ +{ \ + return find_uac_clock_desc(chip->ctrl_intf, id, validator, \ + proto == UAC_VERSION_3 ? (type3) : (type2), \ + proto); \ } 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); - + union uac23_clock_source_desc, validate_clock_source, + UAC2_CLOCK_SOURCE, 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); - + union uac23_clock_selector_desc, validate_clock_selector, + UAC2_CLOCK_SELECTOR, 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); + union uac23_clock_multiplier_desc, validate_clock_multiplier, + UAC2_CLOCK_MULTIPLIER, UAC3_CLOCK_MULTIPLIER); static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id) { @@ -159,14 +154,13 @@ static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, int count; unsigned char data; struct usb_device *dev = chip->dev; + union uac23_clock_source_desc *cs_desc; - 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; + cs_desc = snd_usb_find_clock_source(chip, source_id, fmt->protocol); + if (!cs_desc) + return false; + if (fmt->protocol == UAC_VERSION_2) { /* * Assume the clock is valid if clock source supports only one * single sample rate, the terminal is connected directly to it @@ -175,8 +169,8 @@ static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, * reports that clock is invalid. */ if (fmt->nr_rates == 1 && - (fmt->clock & 0xff) == cs_desc->bClockID && - (cs_desc->bmAttributes & 0x3) != + (fmt->clock & 0xff) == cs_desc->v2.bClockID && + (cs_desc->v2.bmAttributes & 0x3) != UAC_CLOCK_SOURCE_TYPE_EXT) return true; } @@ -222,22 +216,16 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, unsigned char data; struct usb_device *dev = chip->dev; u32 bmControls; + union uac23_clock_source_desc *cs_desc; - 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); + cs_desc = snd_usb_find_clock_source(chip, source_id, fmt->protocol); + if (!cs_desc) + return false; - if (!cs_desc) - return false; - bmControls = cs_desc->bmControls; - } + if (fmt->protocol == UAC_VERSION_3) + bmControls = le32_to_cpu(cs_desc->v3.bmControls); + else + bmControls = cs_desc->v2.bmControls; /* If a clock source can't tell us whether it's valid, we assume it is */ if (!uac_v2v3_control_is_readable(bmControls, @@ -267,9 +255,12 @@ 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; + union uac23_clock_source_desc *source; + union uac23_clock_selector_desc *selector; + union uac23_clock_multiplier_desc *multiplier; + int ret, i, cur, err, pins, clock_id; + const u8 *sources; + int proto = fmt->protocol; entity_id &= 0xff; @@ -281,9 +272,9 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, } /* 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); + source = snd_usb_find_clock_source(chip, entity_id, proto); if (source) { - entity_id = source->bClockID; + entity_id = GET_VAL(source, proto, bClockID); if (validate && !uac_clock_source_is_valid(chip, fmt, entity_id)) { usb_audio_err(chip, @@ -294,27 +285,29 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, return entity_id; } - selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id); + selector = snd_usb_find_clock_selector(chip, entity_id, proto); if (selector) { - int ret, i, cur, err; + pins = GET_VAL(selector, proto, bNrInPins); + clock_id = GET_VAL(selector, proto, bClockID); + sources = GET_VAL(selector, proto, baCSourceID); - if (selector->bNrInPins == 1) { + if (pins == 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); + ret = uac_clock_selector_get_val(chip, clock_id); if (ret < 0) return ret; /* Selector values are one-based */ - if (ret > selector->bNrInPins || ret < 1) { + if (ret > pins || ret < 1) { usb_audio_err(chip, "%s(): selector reported illegal value, id %d, ret %d\n", - __func__, selector->bClockID, ret); + __func__, clock_id, ret); return -EINVAL; } @@ -322,7 +315,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, find_source: cur = ret; ret = __uac_clock_find_source(chip, fmt, - selector->baCSourceID[ret - 1], + sources[ret - 1], visited, validate); if (ret > 0) { err = uac_clock_selector_set_val(chip, entity_id, cur); @@ -334,12 +327,12 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, return ret; /* The current clock source is invalid, try others. */ - for (i = 1; i <= selector->bNrInPins; i++) { + for (i = 1; i <= pins; i++) { if (i == cur) continue; ret = __uac_clock_find_source(chip, fmt, - selector->baCSourceID[i - 1], + sources[i - 1], visited, true); if (ret < 0) continue; @@ -358,112 +351,11 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, } /* FIXME: multipliers only act as pass-thru element for now */ - multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id); + multiplier = snd_usb_find_clock_multiplier(chip, entity_id, proto); 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], + GET_VAL(multiplier, proto, bCSourceID), 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; } @@ -487,10 +379,8 @@ int snd_usb_clock_find_source(struct snd_usb_audio *chip, 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, + return __uac_clock_find_source(chip, fmt, fmt->clock, visited, validate); default: return -EINVAL; @@ -593,18 +483,13 @@ int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip, u32 bmControls; __le32 data; int err; + union uac23_clock_source_desc *cs_desc; - 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; - } + cs_desc = snd_usb_find_clock_source(chip, clock, fmt->protocol); + if (fmt->protocol == UAC_VERSION_3) + bmControls = le32_to_cpu(cs_desc->v3.bmControls); + else + bmControls = cs_desc->v2.bmControls; writeable = uac_v2v3_control_is_writeable(bmControls, UAC2_CS_CONTROL_SAM_FREQ); From patchwork Tue May 18 15:21:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 441262 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0996DC433B4 for ; Tue, 18 May 2021 15:23:15 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 490F0611BD for ; 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Tue, 18 May 2021 17:21:35 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 9AEB0F8014C; Tue, 18 May 2021 17:21:33 +0200 (CEST) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id E3198F8014C for ; Tue, 18 May 2021 17:21:26 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz E3198F8014C X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 59329B15E for ; Tue, 18 May 2021 15:21:26 +0000 (UTC) From: Takashi Iwai To: alsa-devel@alsa-project.org Subject: [PATCH 2/2] ALSA: usb-audio: Handle error for the current selector gracefully Date: Tue, 18 May 2021 17:21:12 +0200 Message-Id: <20210518152112.8016-3-tiwai@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210518152112.8016-1-tiwai@suse.de> References: <20210518152112.8016-1-tiwai@suse.de> MIME-Version: 1.0 X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Currently we bail out when the device returns an error or an invalid value for the current clock selector value via uac_clock_selector_get_val(). But it's possible that the device is really uninitialized and waits for the setup of the proper route at first. For handling such a case, this patch lets the driver dealing with the error or the invalid error more gracefully, choosing the clock source automatically instead. Signed-off-by: Takashi Iwai --- sound/usb/clock.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/sound/usb/clock.c b/sound/usb/clock.c index 48a79f1b6233..772478c725c2 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -299,8 +299,11 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, /* the entity ID we are looking for is a selector. * find out what it currently selects */ ret = uac_clock_selector_get_val(chip, clock_id); - if (ret < 0) - return ret; + if (ret < 0) { + if (!chip->autoclock) + return ret; + goto find_others; + } /* Selector values are one-based */ @@ -309,7 +312,10 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, "%s(): selector reported illegal value, id %d, ret %d\n", __func__, clock_id, ret); - return -EINVAL; + if (!chip->autoclock) + return -EINVAL; + ret = 0; + goto find_others; } find_source: @@ -326,6 +332,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, if (!validate || ret > 0 || !chip->autoclock) return ret; + find_others: /* The current clock source is invalid, try others. */ for (i = 1; i <= pins; i++) { if (i == cur)