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From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org,
	vkoul@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com,
	srinivas.kandagatla@linaro.org, Blauciak@vger.kernel.org,
	Slawomir <slawomir.blauciak@intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Sanyog Kale <sanyog.r.kale@intel.com>
Subject: [PATCH 15/17] soundwire: intel_init: add kernel module parameter to filter out links
Date: Mon,  5 Aug 2019 19:55:20 -0500	[thread overview]
Message-ID: <20190806005522.22642-16-pierre-louis.bossart@linux.intel.com> (raw)
In-Reply-To: <20190806005522.22642-1-pierre-louis.bossart@linux.intel.com>

The hardware and ACPI info may report the presence of links that are
not physically enabled (e.g. due to pin-muxing or hardware reworks),
which in turn can result in errors being thrown. This shouldn't be the
case for production devices but will happen a lot on development
devices - even more so when they expose a connector.

Even when the ACPI information is correct, it's useful to be able to
only enable the links that need attention - mostly to filter out
dynamic debug messages.

Add a module parameter to filter out such links, e.g. adding the
following config to a file in /etc/modprobe.d will select the second
and third links only.

options soundwire_intel_init sdw_link_mask=0x6

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 drivers/soundwire/intel_init.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index 70637a0383d2..b74c2f144962 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -22,6 +22,10 @@
 #define SDW_LINK_BASE		0x30000
 #define SDW_LINK_SIZE		0x10000
 
+static int link_mask;
+module_param_named(sdw_link_mask, link_mask, int, 0444);
+MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)");
+
 struct sdw_link_data {
 	struct sdw_intel_link_res res;
 	struct platform_device *pdev;
@@ -111,6 +115,13 @@ static struct sdw_intel_ctx
 
 	/* Create SDW Master devices */
 	for (i = 0; i < count; i++) {
+		if (link_mask && !(link_mask & BIT(i))) {
+			dev_dbg(&adev->dev,
+				"Link %d masked, will not be enabled\n", i);
+			link++;
+			continue;
+		}
+
 		link->res.irq = res->irq;
 		link->res.registers = res->mmio_base + SDW_LINK_BASE
 					+ (SDW_LINK_SIZE * i);
-- 
2.20.1


  parent reply	other threads:[~2019-08-06  0:55 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-06  0:55 [PATCH 00/17] soundwire: fixes for 5.4 Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 01/17] soundwire: intel: prevent possible dereference in hw_params Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 02/17] soundwire: intel: fix channel number reported by hardware Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 03/17] soundwire: cadence_master: revisit interrupt settings Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 04/17] soundwire: bus: improve dynamic debug comments for enumeration Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 05/17] soundwire: export helpers to find row and column values Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 06/17] soundwire: cadence_master: use firmware defaults for frame shape Pierre-Louis Bossart
2019-08-06 15:27   ` Cezary Rojewski
2019-08-06 15:36     ` [alsa-devel] " Pierre-Louis Bossart
2019-08-06 16:06       ` Cezary Rojewski
2019-08-06 16:06         ` Cezary Rojewski
2019-08-14  4:31         ` [alsa-devel] " Vinod Koul
2019-08-14 14:03           ` Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 07/17] soundwire: include mod_devicetable.h to avoid compiling warnings Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 08/17] soundwire: stream: fix disable sequence Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 09/17] soundwire: stream: remove unnecessary variable initializations Pierre-Louis Bossart
2019-08-06 15:31   ` Cezary Rojewski
2019-08-06 15:39     ` Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 10/17] soundwire: add new mclk_freq field for properties Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 11/17] soundwire: intel: read mclk_freq property from firmware Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 12/17] soundwire: cadence_master: make use of mclk_freq property Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 13/17] soundwire: cadence_master: fix divider setting in clock register Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 14/17] soundwire: intel: handle disabled links Pierre-Louis Bossart
2019-08-06  0:55 ` Pierre-Louis Bossart [this message]
2019-08-06  0:55 ` [PATCH 16/17] soundwire: cadence_master: add kernel parameter to override interrupt mask Pierre-Louis Bossart
2019-08-06  0:55 ` [PATCH 17/17] soundwire: intel: move shutdown() callback and don't export symbol Pierre-Louis Bossart
2019-08-21  9:07 ` [PATCH 00/17] soundwire: fixes for 5.4 Vinod Koul
2019-08-21 14:03   ` [alsa-devel] " Pierre-Louis Bossart

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