From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
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 --- drivers/soundwire/intel.c | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 7dc6569ac431..6a1e862b16c3 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -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); }