diff options
| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2024-10-04 04:18:50 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2024-10-10 14:13:55 +0200 |
| commit | cbcb7edd099aee3f001c008fb8bbb1c0d2b7154c (patch) | |
| tree | 2bbafe28b146a1b2b09bd8337a683ef1177c9690 /drivers/soundwire | |
| parent | soundwire: mipi-disco: add support for DP0/DPn 'lane-list' property (diff) | |
| download | linux-cbcb7edd099aee3f001c008fb8bbb1c0d2b7154c.tar.xz linux-cbcb7edd099aee3f001c008fb8bbb1c0d2b7154c.zip | |
soundwire: intel_auxdevice: add kernel parameter for mclk divider
Add a kernel parameter to work-around discrepancies between hardware
and platform firmware, it's not unusual to see e.g. 38.4MHz listed in
_DSD properties as the SoundWire clock source, but the hardware may be
based on a 19.2 MHz mclk source.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20241004021850.9758-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
| -rw-r--r-- | drivers/soundwire/intel_auxdevice.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c index ae689d5d1ab9..599954d92752 100644 --- a/drivers/soundwire/intel_auxdevice.c +++ b/drivers/soundwire/intel_auxdevice.c @@ -41,6 +41,10 @@ static int md_flags; module_param_named(sdw_md_flags, md_flags, int, 0444); MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)"); +static int mclk_divider; +module_param_named(sdw_mclk_divider, mclk_divider, int, 0444); +MODULE_PARM_DESC(sdw_mclk_divider, "SoundWire Intel mclk divider"); + struct wake_capable_part { const u16 mfg_id; const u16 part_id; @@ -142,8 +146,12 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus) "intel-sdw-ip-clock", &prop->mclk_freq); - /* the values reported by BIOS are the 2x clock, not the bus clock */ - prop->mclk_freq /= 2; + if (mclk_divider) + /* use kernel parameter for BIOS or board work-arounds */ + prop->mclk_freq /= mclk_divider; + else + /* the values reported by BIOS are the 2x clock, not the bus clock */ + prop->mclk_freq /= 2; fwnode_property_read_u32(link, "intel-quirk-mask", |