From patchwork Wed Dec 18 08:01:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bard Liao X-Patchwork-Id: 13913150 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 395A31662EF; Wed, 18 Dec 2024 08:02:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734508938; cv=none; b=aEcnwdRtJx4g0RifoaOcHBMuyyijzdhTHJFEp+4wQOlBQkK2JM5Bx1ubdttgDdcMZU6LfsYjWizqLXeSIfMVNPmYk+fSOuteZGjbTH8I7k6KiGUhiGy5g6r0hWNpOFDcDoQK63BLCPZ6wupWVYrIFC1IKMl0w34kiXnZdLvUtEM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734508938; c=relaxed/simple; bh=59bEtfRaVj423x64sYt038E3O0mYimIWQQSEY98Z8tE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VoroPWbiFYWAQWsaep50bIqRuIGm/VO37esDdccbHM4j06TqGhyacf3h9DT0FZXniHgXTLW54sZyMvuuvR4IbzqA/mRf3lRi/9r/b7tNAumfgAaPTtNe5+XEgE1lFatojQe5yKJ/qRxzIzeSV55fBx5XEZ7j6ChgB9C+ULSVZn8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=hSLPgdVz; arc=none smtp.client-ip=198.175.65.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="hSLPgdVz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1734508937; x=1766044937; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=59bEtfRaVj423x64sYt038E3O0mYimIWQQSEY98Z8tE=; b=hSLPgdVzQHIXbjHMrhdyQ/j/aI3zmHXL5Nld8HeBOC9ysoUqsvB2es2h /9FgQ6RalypKlLoRFojD5Zlwl2UIoFm2kOVq56ZZQ+uxFilc9tK1S4D/p MDzPpw7ABR05fJ/VBgwzp8Bs3QdR9+vqO6yOeLwqEAXlEetoX3pN+TGbG 5Ebg+6Y8GqXcXcWz19Oil596IQpsVojrBh8QcMqW7eMaDx3IJU84inmDa wPzGGdwdmmHuDf2sPpncZk73DqaqvAM++KvtA7NSAAPECx/ertb1qL102 Z8shLbwYbl+evFAo52LykUEO+q9BLFmsMUTeZnvaR6KhDFQKhC2Yx6p2c w==; X-CSE-ConnectionGUID: mdEOtwH2TZy97i2MeSWfAQ== X-CSE-MsgGUID: 9MbgiWrfQcOYSa1QBUK9zQ== X-IronPort-AV: E=McAfee;i="6700,10204,11289"; a="45978506" X-IronPort-AV: E=Sophos;i="6.12,244,1728975600"; d="scan'208";a="45978506" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Dec 2024 00:02:07 -0800 X-CSE-ConnectionGUID: 71/NoF0bQoORnrp0+22a9g== X-CSE-MsgGUID: J/QdeGJPRuSwWvL2GPK8Ig== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="101914646" Received: from tfalcon-desk.amr.corp.intel.com (HELO yungchua-desk.intel.com) ([10.124.220.206]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Dec 2024 00:02:06 -0800 From: Bard Liao To: linux-sound@vger.kernel.org, vkoul@kernel.org Cc: vinod.koul@linaro.org, linux-kernel@vger.kernel.org, pierre-louis.bossart@linux.dev, bard.liao@intel.com Subject: [PATCH v3 02/14] soundwire: mipi_disco: read lane mapping properties from ACPI Date: Wed, 18 Dec 2024 16:01:43 +0800 Message-ID: <20241218080155.102405-3-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241218080155.102405-1-yung-chuan.liao@linux.intel.com> References: <20241218080155.102405-1-yung-chuan.liao@linux.intel.com> Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The DisCo for SoundWire 2.0 added support for the 'mipi-sdw-lane--mapping' property. Co-developed-by: Chao Song Signed-off-by: Chao Song Signed-off-by: Bard Liao --- drivers/soundwire/mipi_disco.c | 40 +++++++++++++++++++++++++++++++++- include/linux/soundwire/sdw.h | 5 +++++ 2 files changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/soundwire/mipi_disco.c b/drivers/soundwire/mipi_disco.c index 9d59f486edbe..65afb28ef8fa 100644 --- a/drivers/soundwire/mipi_disco.c +++ b/drivers/soundwire/mipi_disco.c @@ -366,6 +366,44 @@ static int sdw_slave_read_dpn(struct sdw_slave *slave, return 0; } +/* + * In MIPI DisCo spec for SoundWire, lane mapping for a slave device is done with + * mipi-sdw-lane-x-mapping properties, where x is 1..7, and the values for those + * properties are mipi-sdw-manager-lane-x or mipi-sdw-peripheral-link-y, where x + * is an integer between 1 to 7 if the lane is connected to a manager lane, y is a + * character between A to E if the lane is connected to another peripheral lane. + */ +int sdw_slave_read_lane_mapping(struct sdw_slave *slave) +{ + struct sdw_slave_prop *prop = &slave->prop; + struct device *dev = &slave->dev; + char prop_name[30]; + const char *prop_val; + size_t len; + int ret, i; + u8 lane; + + for (i = 0; i < SDW_MAX_LANES; i++) { + snprintf(prop_name, sizeof(prop_name), "mipi-sdw-lane-%d-mapping", i); + ret = device_property_read_string(dev, prop_name, &prop_val); + if (ret) + continue; + + len = strlen(prop_val); + if (len < 1) + return -EINVAL; + + /* The last character is enough to identify the connection */ + ret = kstrtou8(&prop_val[len - 1], 10, &lane); + if (ret) + return ret; + if (in_range(lane, 1, SDW_MAX_LANES - 1)) + prop->lane_maps[i] = lane; + } + return 0; +} +EXPORT_SYMBOL(sdw_slave_read_lane_mapping); + /** * sdw_slave_read_prop() - Read Slave properties * @slave: SDW Slave @@ -486,6 +524,6 @@ int sdw_slave_read_prop(struct sdw_slave *slave) sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval, prop->sink_ports, "sink"); - return 0; + return sdw_slave_read_lane_mapping(slave); } EXPORT_SYMBOL(sdw_slave_read_prop); diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index bd9836690da6..bb4e33a4db17 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -54,6 +54,8 @@ struct sdw_slave; #define SDW_MAX_PORTS 15 #define SDW_VALID_PORT_RANGE(n) ((n) < SDW_MAX_PORTS && (n) >= 1) +#define SDW_MAX_LANES 8 + enum { SDW_PORT_DIRN_SINK = 0, SDW_PORT_DIRN_SOURCE, @@ -356,6 +358,7 @@ struct sdw_dpn_prop { * and masks are supported * @commit_register_supported: is PCP_Commit register supported * @scp_int1_mask: SCP_INT1_MASK desired settings + * @lane_maps: Lane mapping for the slave, only valid if lane_control_support is set * @clock_reg_supported: the Peripheral implements the clock base and scale * registers introduced with the SoundWire 1.2 specification. SDCA devices * do not need to set this boolean property as the registers are required. @@ -385,6 +388,7 @@ struct sdw_slave_prop { u32 sdca_interrupt_register_list; u8 commit_register_supported; u8 scp_int1_mask; + u8 lane_maps[SDW_MAX_LANES]; bool clock_reg_supported; bool use_domain_irq; }; @@ -450,6 +454,7 @@ struct sdw_master_prop { int sdw_master_read_prop(struct sdw_bus *bus); int sdw_slave_read_prop(struct sdw_slave *slave); +int sdw_slave_read_lane_mapping(struct sdw_slave *slave); /* * SDW Slave Structures and APIs