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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: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Bard 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: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-09-21 03:32:06 +08:00 committed by Vinod Koul
parent dd87a72ae9
commit 0f9138e757
1 changed files with 42 additions and 0 deletions
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42
drivers/soundwire/intel.c
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@ -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);
}