From patchwork Tue Jan 26 08:37:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bard Liao X-Patchwork-Id: 12045885 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,URIBL_BLOCKED,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 0981BC433E0 for ; Tue, 26 Jan 2021 08:40:01 +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 726872065C for ; Tue, 26 Jan 2021 08:40:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 726872065C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com 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 84E8B17C3; Tue, 26 Jan 2021 09:39:08 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 84E8B17C3 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1611650398; bh=x32WrkGUgQciq85+Bq+/F1Jtj/Tu1vtw2eeRIX75M4Q=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=agAgZLW9SVkWyxs/hbrm/hTZo+OuR2Of8jA0yW5VV4yCbtIQQPRx/qR9k7F999roD SdyooRPLeFmlCq5Vm7h09Paab5zQ68jMp9Z8Az7OEHHec4lXXmWeh5c+xACy+o/74T 3jrp4QFKX/dQ7S3fGO9dU/E9du7Go6cPsnZPzXi8= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 758E1F801D8; Tue, 26 Jan 2021 09:38:14 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id DDE9AF8011C; Tue, 26 Jan 2021 09:38:12 +0100 (CET) Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 77304F8011C for ; Tue, 26 Jan 2021 09:38:04 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 77304F8011C IronPort-SDR: dn/IYHZgNoatxcFriReoaXmn29osoonVIsxlepc6wZztg6RuAEEVDSoLnN1Z9q+dFXkyLLLYCB LkwKMqDuVIXg== X-IronPort-AV: E=McAfee;i="6000,8403,9875"; a="198653710" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="198653710" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:38:00 -0800 IronPort-SDR: 8bmCHHC/GO89cpya/Zc4H5EOzdOzGuGl34sxhsdi9m3qpSR2jjbQBU3eFB+cUdn4ihd1DfXyHv 9x56m0kMX5iA== X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="577731222" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:37:57 -0800 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH 1/3] soundwire: bus: clear bus clash interrupt before the mask is enabled Date: Tue, 26 Jan 2021 16:37:44 +0800 Message-Id: <20210126083746.3238-2-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210126083746.3238-1-yung-chuan.liao@linux.intel.com> References: <20210126083746.3238-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, vinod.koul@linaro.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, srinivas.kandagatla@linaro.org, jank@cadence.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com 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" The SoundWire specification allows a Slave device to report a bus clash with the in-band interrupt mechanism when it detects a conflict while driving a bitSlot it owns. This can be a symptom of an electrical conflict or a programming error, and it's vital to detect reliably. Unfortunately, on some platforms, bus clashes are randomly reported by Slave devices after a bus reset, with an interrupt status set even before the bus clash interrupt is enabled. These initial spurious interrupts are not relevant and should optionally be filtered out, while leaving the interrupt mechanism enabled to detect 'true' issues. This patch suggests the addition of a Master level quirk to discard such interrupts. The quirk should in theory have been added at the Slave level, but since the problem was detected with different generations of Slave devices it's hard to point to a specific IP. The problem might also be board-dependent and hence dealing with a Master quirk is simpler. Signed-off-by: Bard Liao Reviewed-by: Rander Wang Reviewed-by: Pierre-Louis Bossart --- drivers/soundwire/bus.c | 10 ++++++++++ include/linux/soundwire/sdw.h | 4 ++++ 2 files changed, 14 insertions(+) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 6e1c988f3845..d394905936e4 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -1240,6 +1240,7 @@ static int sdw_slave_set_frequency(struct sdw_slave *slave) static int sdw_initialize_slave(struct sdw_slave *slave) { struct sdw_slave_prop *prop = &slave->prop; + int status; int ret; u8 val; @@ -1247,6 +1248,15 @@ static int sdw_initialize_slave(struct sdw_slave *slave) if (ret < 0) return ret; + if (slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH) { + /* Clear bus clash interrupt before enabling interrupt mask */ + status = sdw_read_no_pm(slave, SDW_SCP_INT1); + if (status & SDW_SCP_INT1_BUS_CLASH) { + dev_warn(&slave->dev, "Bus clash detected before INT mask is enabled\n"); + sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH); + } + } + /* * Set SCP_INT1_MASK register, typically bus clash and * implementation-defined interrupt mask. The Parity detection diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index f0b01b728640..a2766c3b603d 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -405,6 +405,7 @@ struct sdw_slave_prop { * command * @mclk_freq: clock reference passed to SoundWire Master, in Hz. * @hw_disabled: if true, the Master is not functional, typically due to pin-mux + * @quirks: bitmask identifying optional behavior beyond the scope of the MIPI specification */ struct sdw_master_prop { u32 revision; @@ -421,8 +422,11 @@ struct sdw_master_prop { u32 err_threshold; u32 mclk_freq; bool hw_disabled; + u32 quirks; }; +#define SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH BIT(0) + int sdw_master_read_prop(struct sdw_bus *bus); int sdw_slave_read_prop(struct sdw_slave *slave); From patchwork Tue Jan 26 08:37:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bard Liao X-Patchwork-Id: 12045887 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,URIBL_BLOCKED,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 38710C433E0 for ; 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a="198653716" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="198653716" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:38:02 -0800 IronPort-SDR: y0edbAUzfmdnuDr9NgUYYHiPQIKnrIy+RDtFJeHKWNm0l8iOSsKCXBZh3oZryM8m7h1dYvChZs GjAiCFNzZ2vA== X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="577731234" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:37:59 -0800 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH 2/3] soundwire: intel: add SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH quirk Date: Tue, 26 Jan 2021 16:37:45 +0800 Message-Id: <20210126083746.3238-3-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210126083746.3238-1-yung-chuan.liao@linux.intel.com> References: <20210126083746.3238-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, vinod.koul@linaro.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, srinivas.kandagatla@linaro.org, jank@cadence.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com 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" There is nothing we can do to handle the bus clash interrupt before interrupt mask is enabled. Signed-off-by: Bard Liao Reviewed-by: Rander Wang Reviewed-by: Pierre-Louis Bossart --- drivers/soundwire/intel.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index a2d5cdaa9998..f7ba1a77a1df 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1286,6 +1286,8 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus) if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) prop->hw_disabled = true; + prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH; + return 0; } From patchwork Tue Jan 26 08:37:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bard Liao X-Patchwork-Id: 12045889 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=-21.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 05C0CC433E0 for ; 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a="198653725" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="198653725" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:38:05 -0800 IronPort-SDR: 1d9CLidnFpCJ+x7uxzkeQmk0n5naV+VadWcUvdkWpRRML1ryGTjUzELBuhOLcP4LdTjA/yLTXB BMzmT9WIYtwQ== X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="577731243" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2021 00:38:02 -0800 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH 3/3] soundwire: bus: clear parity interrupt before the mask is enabled Date: Tue, 26 Jan 2021 16:37:46 +0800 Message-Id: <20210126083746.3238-4-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210126083746.3238-1-yung-chuan.liao@linux.intel.com> References: <20210126083746.3238-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, vinod.koul@linaro.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, srinivas.kandagatla@linaro.org, jank@cadence.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com 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" From: Pierre-Louis Bossart We recently added the ability to discard bus clash interrupts reported on startup. These bus clash interrupts can happen randomly on some platforms and don't seem to be valid. A master-level quirk helped squelch those spurious errors. Additional tests on a new platform with the Maxim 98373 amplifier showed a rare case where the parity interrupt is also thrown on startup, at the same time as bus clashes. This issue only seems to happen infrequently and was only observed during suspend-resume stress tests while audio is streaming. We could make the problem go away by adding a Slave-level quirk, but there is no evidence that the issue is actually a Slave problem: the parity is provided by the Master, which could also set an invalid parity in corner cases. This patch suggests an additional bus-level quirk for parity, which is only applied when the codec device is not known to have an issue with parity. The initial parity error will be ignored, but a trace will be logged to help identify potential root causes (likely a combination of issues on both master and slave sides influenced by board-specific electrical parameters). BugLink: https://github.com/thesofproject/linux/issues/2533 Signed-off-by: Pierre-Louis Bossart Reviewed-by: Rander Wang Signed-off-by: Bard Liao --- drivers/soundwire/bus.c | 9 +++++++++ drivers/soundwire/intel.c | 3 ++- include/linux/soundwire/sdw.h | 1 + 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index d394905936e4..57581fdb2ea9 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -1256,6 +1256,15 @@ static int sdw_initialize_slave(struct sdw_slave *slave) sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH); } } + if ((slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY) && + !(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY)) { + /* Clear parity interrupt before enabling interrupt mask */ + status = sdw_read_no_pm(slave, SDW_SCP_INT1); + if (status & SDW_SCP_INT1_PARITY) { + dev_warn(&slave->dev, "PARITY error detected before INT mask is enabled\n"); + sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_PARITY); + } + } /* * Set SCP_INT1_MASK register, typically bus clash and diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index f7ba1a77a1df..c1fdc85d0a74 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1286,7 +1286,8 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus) if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) prop->hw_disabled = true; - prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH; + prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH | + SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY; return 0; } diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index a2766c3b603d..30415354d419 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -426,6 +426,7 @@ struct sdw_master_prop { }; #define SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH BIT(0) +#define SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY BIT(1) int sdw_master_read_prop(struct sdw_bus *bus); int sdw_slave_read_prop(struct sdw_slave *slave);