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a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version: Content-Type; bh=ZJ1CeXr5L+70RmndFbrJnevySNkuujkOo+h0+Lv9h0U=; b=PqujgYETxj5f7eV9lUrTkoUzayo9LMbSPGWyHOPRvIQDbxPQP1lCJA5gQGeIjU mOrersbX7qIPd8kNbxGZqZSDU/ToKHAHBMu7JpoBQxo7DOOjQjVwUS6OiOfXdzVV 6qq1pkk5xVjb1OQgQlXgMK8qxTXJ45WlpwEL3srKXnuWs= Received: from localhost.localdomain (unknown [111.48.58.12]) by gzga-smtp-mta-g0-3 (Coremail) with SMTP id _____wDH7ou1495l4CPFFQ--.17527S2; Wed, 28 Feb 2024 15:41:41 +0800 (CST) From: songxiebing To: tiwai@suse.com Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, songxiebing Subject: [PATCH v1] ALSA: hda: optimize the probe codec process Date: Wed, 28 Feb 2024 15:41:38 +0800 Message-Id: <20240228074138.23679-1-soxiebing@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: _____wDH7ou1495l4CPFFQ--.17527S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Wry3Jr4UAFW7Ar1UJrWxtFb_yoW8Kr1Up3 W3Cr1fG3yxtF4akFs7Gw43Ka4xWa4kXan8Jw4Yyw13Xwn3Kr1fXr9YyrW8AFW8Cr429r1Y vw4UK3WkX3s8CaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07j0iifUUUUU= X-Originating-IP: [111.48.58.12] X-CM-SenderInfo: 5vr0xvpelqwqqrwthudrp/xtbB0BqSw2WXwG99aQAAsS X-MailFrom: soxiebing@163.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1 Message-ID-Hash: DZUCMXQ2J7BSRP3IORV5AHWMFOT5AZBT X-Message-ID-Hash: DZUCMXQ2J7BSRP3IORV5AHWMFOT5AZBT X-Mailman-Approved-At: Wed, 28 Feb 2024 14:13:41 +0000 X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: songxiebing In azx_probe_codecs function，when bus->codec_mask is becomes to 0(no codecs), execute azx_init_chip, bus->codec_mask will be initialized to a value again， this causes snd_hda_codec_new function to run, the process is as follows: -->snd_hda_codec_new -->snd_hda_codec_device_init -->snd_hdac_device_init---snd_hdac_read_parm(...AC_PAR_VENDOR_ID) 2s ---snd_hdac_read_parm(...AC_PAR_VENDOR_ID) 2s ---snd_hdac_read_parm(...AC_PAR_SUBSYSTEM_ID) 2s ---snd_hdac_read_parm(...AC_PAR_REV_ID) 2s ---snd_hdac_read_parm(...AC_PAR_NODE_COUNT) 2s when no codecs, read communication is error, each command will be polled for 2 second，a total of 10s, it is easy to some problem. like this: 2 [ 14.833404][ 6] [ T164] hda 0006:00: Codec #0 probe error; disabling it... 3 [ 14.844178][ 6] [ T164] hda 0006:00: codec_mask = 0x1 4 [ 14.880532][ 6] [ T164] hda 0006:00: too slow response, last cmd=0x0f0000 5 [ 15.891988][ 6] [ T164] hda 0006:00: too slow response, last cmd=0x0f0000 6 [ 16.978090][ 6] [ T164] hda 0006:00: too slow response, last cmd=0x0f0001 7 [ 18.140895][ 6] [ T164] hda 0006:00: too slow response, last cmd=0x0f0002 8 [ 19.135516][ 6] [ T164] hda 0006:00: too slow response, last cmd=0x0f0004 10 [ 19.900086][ 6] [ T164] hda 0006:00: no codecs initialized 11 [ 45.573398][ 2] [ C2] watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2:0:25] Here, when bus->codec_mask is 0, use a direct break to avoid execute snd_hda_codec_new function. Signed-off-by: songxiebing --- sound/pci/hda/hda_controller.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c index e5c53ad..e1ece0a 100644 --- a/sound/pci/hda/hda_controller.c +++ b/sound/pci/hda/hda_controller.c @@ -1474,6 +1474,9 @@ int azx_probe_codecs(struct azx *chip, unsigned int max_slots) dev_warn(chip->card->dev, "Codec #%d probe error; disabling it...\n", c); bus->codec_mask &= ~(1 << c); + /* no codecs */ + if (bus->codec_mask == 0) + break; /* More badly, accessing to a non-existing * codec often screws up the controller chip, * and disturbs the further communications.