Commit 0f9138e7 authored by Pierre-Louis Bossart's avatar Pierre-Louis Bossart Committed by Vinod Koul
Browse files

soundwire: intel: enable test modes 



This patch adds debugfs support to override the Master and Slave data
modes. The settings only take effect prior to a new stream being
prepared/enabled, or on resume.

The test mode can be set to verify data integrity and detect bus
clashes, but can only be used to test capture paths. In this case the
input generated by a Slave source port is replaced by a fixed or
cyclical patterns.

Signed-off-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: default avatarGuennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: default avatarRander Wang <rander.wang@linux.intel.com>
Signed-off-by: default avatarBard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200920193207.31241-3-yung-chuan.liao@linux.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent dd87a72a

drivers/soundwire/intel.c

+42 −0
Original line number Diff line number Diff line
@@ -262,6 +262,42 @@ static int intel_reg_show(struct seq_file *s_file, void *data) 
}

DEFINE_SHOW_ATTRIBUTE(intel_reg);



static int intel_set_m_datamode(void *data, u64 value)

{

	struct sdw_intel *sdw = data;

	struct sdw_bus *bus = &sdw->cdns.bus;



	if (value > SDW_PORT_DATA_MODE_STATIC_1)

		return -EINVAL;



	/* Userspace changed the hardware state behind the kernel's back */

	add_taint(TAINT_USER, LOCKDEP_STILL_OK);



	bus->params.m_data_mode = value;



	return 0;

}

DEFINE_DEBUGFS_ATTRIBUTE(intel_set_m_datamode_fops, NULL,

			 intel_set_m_datamode, "%llu\n");



static int intel_set_s_datamode(void *data, u64 value)

{

	struct sdw_intel *sdw = data;

	struct sdw_bus *bus = &sdw->cdns.bus;



	if (value > SDW_PORT_DATA_MODE_STATIC_1)

		return -EINVAL;



	/* Userspace changed the hardware state behind the kernel's back */

	add_taint(TAINT_USER, LOCKDEP_STILL_OK);



	bus->params.s_data_mode = value;



	return 0;

}

DEFINE_DEBUGFS_ATTRIBUTE(intel_set_s_datamode_fops, NULL,

			 intel_set_s_datamode, "%llu\n");



static void intel_debugfs_init(struct sdw_intel *sdw)

{

	struct dentry *root = sdw->cdns.bus.debugfs;
@@ -274,6 +310,12 @@ static void intel_debugfs_init(struct sdw_intel *sdw) 
	debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,

			    &intel_reg_fops);



	debugfs_create_file("intel-m-datamode", 0200, sdw->debugfs, sdw,

			    &intel_set_m_datamode_fops);



	debugfs_create_file("intel-s-datamode", 0200, sdw->debugfs, sdw,

			    &intel_set_s_datamode_fops);



	sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);

}

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