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authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>2019-08-05 19:55:20 -0500
committerVinod Koul <vkoul@kernel.org>2019-08-21 14:36:18 +0530
commit50302fc7b936c1b00e39d4a4f118fb43d3f5ef2c (patch)
tree2dd4282de5cd465c28e6121ba532bc48cd74bbc0 /drivers/soundwire
parenta50954e211d9ad4f01de73c5bfcc340903b085f1 (diff)
soundwire: intel_init: add kernel module parameter to filter out links
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> Link: https://lore.kernel.org/r/20190806005522.22642-16-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
-rw-r--r--drivers/soundwire/intel_init.c11
1 files changed, 11 insertions, 0 deletions
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);