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author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2020-09-21 03:32:06 +0800 |
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committer | Vinod Koul <vkoul@kernel.org> | 2020-09-23 15:29:30 +0530 |
commit | 0f9138e75753511572f67b1bf943224d504ca170 (patch) | |
tree | a9fc89363753fd0ad3a31ad8525164d2749a3599 /drivers/soundwire/intel.c | |
parent | dd87a72ae968f70852cd7a2d939acd9693e76095 (diff) | |
download | linux-0f9138e75753511572f67b1bf943224d504ca170.tar.bz2 |
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>
Diffstat (limited to 'drivers/soundwire/intel.c')
-rw-r--r-- | drivers/soundwire/intel.c | 42 |
1 files changed, 42 insertions, 0 deletions
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); } |